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Ma Y, Lu Y, Yue Y, He S, Jiang S, Mei C, Xu X, Wu Q, Xiao H, Han J. Nanocellulose-mediated bilayer hydrogel actuators with thermo-responsive, shape memory and self-sensing performances. Carbohydr Polym 2024; 335:122067. [PMID: 38616090 DOI: 10.1016/j.carbpol.2024.122067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 03/04/2024] [Accepted: 03/14/2024] [Indexed: 04/16/2024]
Abstract
Inspired by creatures, abundant stimulus-responsive hydrogel actuators with diverse functionalities have been manufactured for applications in soft robotics. However, constructing a shape memory and self-sensing bilayer hydrogel actuator with high mechanical strength and strong interfacial bonding still remains a challenge. Herein, a novel bilayer hydrogel with a stimulus-responsive TEMPO-oxidized cellulose nanofibers/poly(N-isopropylacrylamide) (TOCN/PNIPAM) layer and a non-responsive TOCN/polyacrylamide (TOCN/PAM) layer is proposed as a thermosensitive actuator. TOCNs as a nano-reinforced phase provide a high mechanical strength and endow the hydrogel actuator with a strong interfacial bonding. Due to the incorporation of TOCNs, the TOCN/PNIPAM hydrogel exhibits a high compressive strength (~89.2 kPa), elongation at break (~170.7 %) and tensile strength (~24.0 kPa). The prepared PNIPAM/TOCN/PAM hydrogel actuator performs the roles of an encapsulation, jack, temperature-controlled fluid valve and temperature-control manipulator. The incorporation of Fe3+ further endows the bilayer hydrogel actuator with a synergistic performance of shape memory and temperature-driven, which can be used as a temperature-responsive switch to detect ambient temperature. The PNIPAM/TOCN/PAM-Fe3+ conductive hydrogel can be assembled into a flexible sensor and generate sensing signals when driven by temperature changes to achieve real-time feedback. This research may lead to new insights into the design and manufacturing of intelligent flexible soft robots.
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Affiliation(s)
- Yuanyuan Ma
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Joint International Research Lab of Lignocellulosic Functional Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Ya Lu
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Joint International Research Lab of Lignocellulosic Functional Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Yiying Yue
- College of Biology and Environment, Nanjing Forestry University, Nanjing 210037, China.
| | - Shuijian He
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Joint International Research Lab of Lignocellulosic Functional Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Shaohua Jiang
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Joint International Research Lab of Lignocellulosic Functional Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Changtong Mei
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Xinwu Xu
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Qinglin Wu
- School of Renewable Natural Resources, Louisiana State University, Baton Rouge, LA 70803, United States
| | - Huining Xiao
- Department of Chemical Engineering, University of New Brunswick, 15 Dineen Drive, Fredericton, NB E3B 5A3, Canada
| | - Jingquan Han
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Joint International Research Lab of Lignocellulosic Functional Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
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Lu Q, Liu W, Chen D, Yu D, Song Z, Wang H, Li G, Liu X, Ge S. Hydrophobic association-improved multi-functional hydrogels with liquid metal droplets stabilized by xanthan gum and PEDOT:PSS for strain sensors. Int J Biol Macromol 2024; 271:132494. [PMID: 38788874 DOI: 10.1016/j.ijbiomac.2024.132494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 05/04/2024] [Accepted: 05/16/2024] [Indexed: 05/26/2024]
Abstract
The synthesis of liquid metal-infused hydrogels, typically constituted by polyacrylamide networks crosslinked through covalent bonds, often encounters a conundrum: they exhibit restricted extensibility and a diminished capacity for self-repair, owing to the inherently irreversible nature of the covalent linkages. This study introduces a hydrophobically associated hydrogel embedding gallium (Ga)-droplets, realized through the in situ free radical copolymerization of hydrophobic hexadecyl methacrylate (HMA) and hydrophilic acrylamide (AM) in a milieu containing xanthan gum (XG) and PEDOT:PSS, which co-stabilizes the Ga-droplets. The Ga-droplets, synergistically functioning as conductive agents alongside PEDOT:PSS, also expedite the hydrogel's formation. The resultant XG/PEDOT:PSS-Ga-P(AM-HMA) hydrogel is distinguished by its remarkable extensibility (2950 %), exceptional toughness (3.28 MJ/m3), superior adherence to hydrophobic, smooth substrates, and an innate ability for hydrophobic-driven self-healing. As a strain sensing medium, this hydrogel-based sensor exhibits heightened sensitivity (gauge factor = 12.66), low detection threshold (0.1 %), and robust durability (>500 cycles). Furthermore, the inclusion of glycerol endows the XG/PEDOT:PSS-Ga-P(AM-HMA) hydrogel with anti-freezing properties without compromising its mechanical integrity and sensing acumen. This sensor adeptly captures a spectrum of human movements, from the nuanced radial pulse to extensive joint articulations. This research heralds a novel approach for fabricating multifaceted PAM-based hydrogels with toughness and superior sensing capabilities.
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Affiliation(s)
- Qishu Lu
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Wenxia Liu
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China.
| | - Duo Chen
- Department of Optoelectronic Science and Technology, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Dehai Yu
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China.
| | - Zhaoping Song
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Huili Wang
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Guodong Li
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Xiaona Liu
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Shaohua Ge
- Department of Periodontology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong 250012, China
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Zhu X, Yan Z, Liu S, Zhou M, Zeng X, Wang S, Jia Y. Simultaneous stabilization of particulate and bioavailable arsenic in soils from the realgar mining area by polyacrylamide, nano-SiO 2, and ferrihydrite composite materials. Sci Total Environ 2024; 926:172123. [PMID: 38575008 DOI: 10.1016/j.scitotenv.2024.172123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 03/28/2024] [Accepted: 03/29/2024] [Indexed: 04/06/2024]
Abstract
Arsenic (As) contamination in realgar mining areas poses a severe environmental and health risk, highlighting the critical need for effective strategies to manage As migration, particularly in its particulate and bioavailable states. Soil erosion and water leaching serve as significant pathways for spreading As, emphasizing the imperative to curtail its mobility. In the present study, we proposed an effective strategy that combines the utilization of polyacrylamide (PAM), nano-SiO2 (NS), and ferrihydrite (Fh) to elevate the stability of As in soils from a realgar mining area. The results show that this composite material demonstrates the capability to concurrently regulate soil erosion and mitigate the leaching of bioavailable As. The combination of the three materials in the proportion of 0.5 % PAM +0.1 % NS + 1.0 % Fh can reduce the soil particulate and bioavailable As content by 99.11 % and 93.98 %, respectively. The unconfined compressive strength of the soil can be increased by about 30 % under this condition. The SEM analyses show that the addition of PAM and NS can significantly enhance the aggregation of soil particles and then reduce the soil erosion rate. These findings highlight the significant potential of the proposed approach in mitigating As contamination in soil within mining environments. The approach offers a sustainable and comprehensive solution to address the transport of heavy metal contaminants in both particulate and bioavailable states in mining areas.
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Affiliation(s)
- Xiayu Zhu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Zelong Yan
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Shichao Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Mengchao Zhou
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Xiangfeng Zeng
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
| | - Shaofeng Wang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
| | - Yongfeng Jia
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
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Li X, Wang Y, Tian Y, Wang Z, Zhang L, Ma J. Aqueous AlCl 3/ZnCl 2 solution room-induced the self-growing strategy of expanded topological network for cellulose/ polyacrylamide-based solid-state electrolytes. J Colloid Interface Sci 2024; 670:311-322. [PMID: 38763027 DOI: 10.1016/j.jcis.2024.05.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 05/13/2024] [Accepted: 05/14/2024] [Indexed: 05/21/2024]
Abstract
The green synthesis strategy for cellulose-containing hydrogel electrolytes is significant for effectively managing resources, energy, and environmental concerns in the contemporary world. Herein, we propose an all-green strategy using AlCl3/ZnCl2/H2O solvent to create cellulose/polyacrylamide-based hydrogel (AZ-Cel/PAM) with expanded hierarchical topologies. The aqueous AlCl3/ZnCl2 facilitates the efficient dissolution of cellulose at room temperature, and the dispersed Al3+-Zn2+ ions autocatalytic system catalyzes in-situ polymerization of acrylamide (AM) monomer. This expands the AM network within the cellulose framework, forming multiple bonding interactions and stable ion channels. The resulting hybrid hydrogel exhibits improved mechanical properties (tensile strength of 56.54 kPa and compressive strength of 359.43 kPa) and enhanced ionic conductivity (1.99 S/m). Furthermore, it also demonstrates excellent adhesion, freeze resistance (-45 °C), and water retention capabilities. Quantum simulations further clarify the mechanical composition and ion transport mechanism of AZ-Cel/PAM hydrogels. The assembled supercapacitor with the hydrogel electrolyte, demonstrates an ideal area-specific capacitance of 203.80 mF/cm2. This all-green strategy presents a novel approach to developing sustainable energy storage devices.
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Affiliation(s)
- Xin Li
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Youlong Wang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Yahui Tian
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Zhiguo Wang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Lili Zhang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China.
| | - Jinxia Ma
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China.
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Bliddal H, Beier J, Hartkopp A, Conaghan PG, Henriksen M. Effectiveness and safety of polyacrylamide hydrogel injection for knee osteoarthritis: results from a 12-month follow up of an open-label study. J Orthop Surg Res 2024; 19:274. [PMID: 38698396 PMCID: PMC11064315 DOI: 10.1186/s13018-024-04756-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 04/21/2024] [Indexed: 05/05/2024] Open
Abstract
OBJECTIVE There are few effective osteoarthritis (OA) therapies. A novel injectable polyacrylamide hydrogel (iPAAG) previously demonstrated efficacy and safety up to week 26 in an open-label study of knee OA. Here we report longer-term effectiveness and safety data. METHODS This multi-centre, open-label study included patients with symptomatic and radiographic knee OA. Primary outcome was WOMAC pain (0-100 scale) at 13 weeks, and patients continued to 26 weeks before entering a further 26-week extension phase. Secondary efficacy outcomes included WOMAC stiffness and function subscales, Patient Global Assessment (PGA) and proportion of OMERACT-OARSI responders. Safety outcomes were adverse events (AEs). RESULTS 49 participants (31 women, mean age 70) received an ultrasound-guided, intra-articular injection of 6 ml iPAAG; 46 completed the extension phase to 52 weeks. There was a significant reduction in the WOMAC pain score from baseline to 52 weeks (- 17.7 points (95% CI - 23.1; - 12.4); p < 0.0001). Similar sustained improvements were observed for WOMAC stiffness (11.0 points; 95% CI - 17.0; - 4.9), physical function (18.0 points; 95% CI - 19.1; - 10.6), and PGA (16.3 points; 95% CI - 23.1; - 9.4). At 52 weeks 62.2% of patients were OMERACT-OARSI responders. From 26 to 52 weeks, 8 adverse effects (AE), including 1 serious AE (cerebrovascular accident) were reported in 5 subjects. None of the new adverse events were thought to be device related. CONCLUSION This open-label study suggests persistent benefits and safety of iPAAG through 52 weeks after a single injection. TRIAL REGISTRATION Clinicaltrials.gov NCT04179552.
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Affiliation(s)
- Henning Bliddal
- The Parker Institute, Bispebjerg Frederiksberg Hospital, University of Copenhagen, Ndr. Fasanvej 57, 2000, Copenhagen, Frederiksberg, Denmark.
| | | | | | - Philip G Conaghan
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds & NIHR Leeds Biomedical Research Centre, Leeds, UK
| | - Marius Henriksen
- The Parker Institute, Bispebjerg Frederiksberg Hospital, University of Copenhagen, Ndr. Fasanvej 57, 2000, Copenhagen, Frederiksberg, Denmark
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Sangar FH, Farahpour MR, Tabatabaei ZG. Facile synthesis of 2-hydroxy-β-cyclodextrin/ polyacrylamide/carbazole hydrogel and its application for the treatment of infected wounds in a murine model. Int J Biol Macromol 2024; 267:131252. [PMID: 38554897 DOI: 10.1016/j.ijbiomac.2024.131252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 03/18/2024] [Accepted: 03/28/2024] [Indexed: 04/02/2024]
Abstract
This work aimed to synthesize hydrogels by combining carbazole (Carb) with 2-hydroxy, β-cyclodextrin (HPβCD)/polyacrylamide (PAA) hybrid complexes. The hydrogels were then evaluated for their potential use in treating infected wounds. The physicochemical structures of the preparations were evaluated using several characterization methods including FTIR, FESEM, EDX, XRD, pH sensitivity, and TGA. Moreover, In vitro release, toxicity, antibacterial activity and in vivo infected wound healing activity were evaluated. Physicochemical testing verified the effective synthesis of the preparations and the timely release of Carb. The P(AA-co-AM)/HPβCD material exhibited an open structure characterized by macroscopic voids, whereas the hydrogels displayed surfaces that were not uniform. The FTIR analysis revealed the creation of a novel polymeric hydrogel composed of HPβCD as the main polymer structure. The hydrogels exhibited good reversible swelling and recoverable deformation, with an optimal swelling ratio of 30.12 achieved at pH 7.4. The antibacterial and safety of the formulations were validated by in vitro studies. β.Dex/PAA/Carb hydrogels have been shown to effectively expedite the healing of infected wounds by promoting the production of CD31, FGF-2, and COL1A, while reducing the levels of ROS, CD68, COX-2, and NF-κB. Overall, the combination of Carb, β.Dex, and PAA molecules had a synergistic impact on the healing process of infected wounds.
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Affiliation(s)
- Fatemeh Hemmatpour Sangar
- Department of Basic Sciences, Faculty of Veterinary Medicine, Urmia Branch, Islamic Azad University, Urmia, Iran
| | - Mohammad Reza Farahpour
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Urmia Branch, Islamic Azad University, Urmia, Iran.
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Zhang Y, Li DQ, Yang CX, Xiong ZW, Tohti M, Zhang YQ, Chen HJ, Li J. Polymerization strategy for cellulose nanocrystals-based photonic crystal films with water resisting property. Int J Biol Macromol 2024; 265:130793. [PMID: 38503368 DOI: 10.1016/j.ijbiomac.2024.130793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/26/2024] [Accepted: 03/09/2024] [Indexed: 03/21/2024]
Abstract
Cellulose nanocrystals (CNCs) can form a liquid crystal film with a chiral nematic structure by evaporative-induced self-assembly (EISA). It has attracted much attention as a new class of photonic liquid crystal material because of its intrinsic, unique structural characteristics, and excellent optical properties. However, the CNCs-based photonic crystal films are generally prepared via the physical crosslinking strategy, which present water sensitivity. Here, we developed CNCs-g-PAM photonic crystal film by combining free radical polymerization and EISA. FT-IR, SEM, POM, XRD, TG-DTG, and UV-Vis techniques were employed to characterize the physicochemical properties and microstructure of the as-prepared films. The CNCs-g-PAM films showed a better thermo-stability than CNCs-based film. Also, the mechanical properties were significantly improved, viz., the elongation at break was 9.4 %, and tensile strength reached 18.5 Mpa, which was a much better enhancement than CNCs-based film. More importantly, the CNCs-g-PAM films can resist water dissolution for more than 24 h, which was impossible for the CNCs-based film. The present study provided a promising strategy to prepare CNCs-based photonic crystal film with high flexibility, water resistance, and optical properties for applications such as decoration, light management, and anti-counterfeiting.
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Affiliation(s)
- Yue Zhang
- College of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumchi 830052, China
| | - De-Qiang Li
- College of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumchi 830052, China.
| | - Cai-Xia Yang
- College of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumchi 830052, China
| | - Zi-Wei Xiong
- College of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumchi 830052, China
| | - Maryamgul Tohti
- College of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumchi 830052, China
| | - Yu-Qing Zhang
- College of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumchi 830052, China
| | - Hong-Jie Chen
- College of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumchi 830052, China
| | - Jun Li
- College of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumchi 830052, China.
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Jiang J, Zou Y, Sun Q, Liu S, Sun M, Zheng H, Li H. Copolymers functionalized with quaternary ammonium compounds under template chain exhibit simultaneously efficient bactericidal and flocculation properties: Characterization, performance and mechanism. J Hazard Mater 2024; 465:133476. [PMID: 38232546 DOI: 10.1016/j.jhazmat.2024.133476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 12/25/2023] [Accepted: 01/07/2024] [Indexed: 01/19/2024]
Abstract
In this work, novel multifunctional cationic template copolymers with flocculation and sterilization capabilities were synthesized using a low-pressure ultraviolet (LP-UV) template polymerization method for the removal of kaolin and Escherichia coli (E. coli) from water. The influence of template agents on the structural performance of the copolymers was evaluated through characterization, which showed that template copolymer TPADM possesses a higher cationic charge density and a more complex rough surface, contributing to better flocculation performance than that of the non-template copolymer CPADM. Under optimal experimental conditions, TPADM-1 exhibited removal rates of 98.45% for kaolin and 99% for E. coli (OD600 =0.04), marginally outperforming the non-template copolymer. Simultaneously, TPADM-1 produced good adaptability to kaolin and E. coli wastewater in terms of wide pH, speculating that charge neutralization, adsorption bridging, patching, and sweeping simultaneously dominate the flocculation mechanism. Interestingly, SEM and 3D-EEM analysis confirm that the sterilization of E. coli occurs through two distinct functions: initially adsorption followed by subsequent cell membrane rupture and leakage of cellular contents, ultimately leading to cell death. This research further confirms the feasibility of the designed novel multifunctional copolymers for achieving simultaneous disinfection and turbidity removal, demonstrating practical applicability in real water treatment processes.
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Affiliation(s)
- Junyi Jiang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China; Institute for Smart City of Chongqing University in Liyang, Chongqing University, Liyang, Jiangsu 213300, PR China
| | - Yuhong Zou
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China; Institute for Smart City of Chongqing University in Liyang, Chongqing University, Liyang, Jiangsu 213300, PR China
| | - Qiang Sun
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China; Institute for Smart City of Chongqing University in Liyang, Chongqing University, Liyang, Jiangsu 213300, PR China
| | - Shuang Liu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China; Institute for Smart City of Chongqing University in Liyang, Chongqing University, Liyang, Jiangsu 213300, PR China
| | - Manli Sun
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China; Institute for Smart City of Chongqing University in Liyang, Chongqing University, Liyang, Jiangsu 213300, PR China
| | - Huaili Zheng
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China; Institute for Smart City of Chongqing University in Liyang, Chongqing University, Liyang, Jiangsu 213300, PR China.
| | - Hong Li
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, PR China; Institute for Smart City of Chongqing University in Liyang, Chongqing University, Liyang, Jiangsu 213300, PR China.
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Wang X, Feng C, Wang L, Liu J, Jin A, Zhu C, Guan F, Huang Z, He H. Experimental study on reducing the viscosity of sewage containing PAM catalyzed by low temperature plasma synergistic AC/Mn + TiO 2. Environ Technol 2024; 45:1581-1595. [PMID: 36399153 DOI: 10.1080/09593330.2022.2148567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Accepted: 11/11/2022] [Indexed: 06/16/2023]
Abstract
With the wide application of polymer flooding technology in oil fields, wastewater containing PAM (polyacrylamide) is produced. Its high viscosity makes it difficult to degrade. In this paper, the low-temperature plasma produced by DBD (Dielectric Barrier Discharge) was studied to reduce the viscosity of wastewater containing PAM under the synergistic action of AC (Activated carbon)/Mn + TiO2 catalyst. The effects of different amount of AC/Mn + TiO2 catalyst, discharge voltage and initial concentration of solution on viscosity reduction were studied. The change of functional groups in wastewater containing PAM was detected by FTIR (Fourier transform infrared absorption spectrometer), and the mechanism of catalytic viscosity reduction was analysed. The AC/Mn + TiO2 catalysts were analysed by XPS (X-ray photoelectron spectroscopy), XRD (X-Ray Diffraction) and ESEM (Field emission electron microscopy). With the increase of discharge voltage, the effect of catalytic viscosity reduction is enhanced. After 10 min of discharge, the effect of catalytic viscosity reduction is significantly enhanced. The catalytic viscosity reduction is best when discharge voltage is 18 KV and discharge time is 30 min. The viscosity reduction of polyacrylamide solution by low-temperature plasma AC/Mn + TiO2 is significant. When the amount of AC/Mn + TiO2 catalyst added is 544 mg, the viscosity of polymer containing solution can be reduced from 1758 mPa·s to 11.9 mPa·s, and the shear rate can be changed from 0 1/sec to 30 1/sec after the discharge for 30 min. The functional groups in solution did not change significantly and the element composition of AC/Mn + TiO2 catalyst did not change before and after catalytic discharge.
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Affiliation(s)
- Xiaobing Wang
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, People's Republic of China
| | - Chen Feng
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, People's Republic of China
- Hefei Gas Group Co., Ltd., Hefei, People's Republic of China
| | - Lu Wang
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, People's Republic of China
| | - Jinqiu Liu
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, People's Republic of China
| | - An Jin
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, People's Republic of China
| | - Chenyang Zhu
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, People's Republic of China
| | - Fengwei Guan
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, People's Republic of China
| | - Zhigang Huang
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, People's Republic of China
| | - Hao He
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, People's Republic of China
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10
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Zhang S, Cao J, Zheng Y, Hou M, Song L, Na J, Jiang Y, Huang Y, Liu T, Wei H. Insight into coagulation/flocculation mechanisms on microalgae harvesting by ferric chloride and polyacrylamide in different growth phases. Bioresour Technol 2024; 393:130082. [PMID: 38006984 DOI: 10.1016/j.biortech.2023.130082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 11/18/2023] [Accepted: 11/19/2023] [Indexed: 11/27/2023]
Abstract
FeCl3 and polyacrylamide (PAM) had been used to investigate the effect of coagulation, flocculation, and their combination on algae cells and extracellular organic matter (EOM) at different phases. PAM tended to aggregate particle-like substances, while FeCl3 could interact with EOM. The content of EOM kept rising during the algae growth cycle, while OD680 peaked at about 3.0. At stationary phase Ⅰ, the removal efficiencies of UV254, turbidity and OD680 of the suspension conditioned with FeCl3 + PAM reached (88.08 ± 0.89)%, (89.72 ± 0.36)% and (93.99 ± 0.05)%, respectively. Nevertheless, PAM + FeCl3 exhibited the worst efficiency because of the release of EOM caused by the turbulence. The results suggested that algal cells served as a coagulation aid to facilitate floc formation, while excessive EOM deteriorated harvesting performance. The process of FeCl3 + PAM at stationary phase Ⅰ appears to be a promising technology for microalgae harvesting.
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Affiliation(s)
- Siqi Zhang
- School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China
| | - Jingyi Cao
- School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China
| | - Yajiao Zheng
- School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China
| | - Meifang Hou
- School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China
| | - Lili Song
- School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China
| | - Jiandie Na
- School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China
| | - Yiqiang Jiang
- School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China
| | - Yichen Huang
- School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China
| | - Tianyi Liu
- School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China
| | - Hua Wei
- School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China.
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11
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Cappitti A, Palmieri F, Garella R, Tani A, Chellini F, Salzano De Luna M, Parmeggiani C, Squecco R, Martella D, Sassoli C. Development of accessible platforms to promote myofibroblast differentiation by playing on hydrogel scaffold composition. Biomater Adv 2023; 155:213674. [PMID: 37922662 DOI: 10.1016/j.bioadv.2023.213674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 10/19/2023] [Accepted: 10/26/2023] [Indexed: 11/07/2023]
Abstract
Mechanomimetic materials are particularly attractive for modeling in vitro fibroblast to myofibroblast (Myof) transition, a key process in the physiological repair of damaged tissue, and recognized as the core cellular mechanism of pathological fibrosis in different organs. In vivo, mechanical stimuli from the extracellular matrix (ECM) are crucial, together with cell-cell contacts and the pro-fibrotic transforming growth factor (TGF)-β1, in promoting fibroblast differentiation. Here, we explore the impact of hydrogels made by polyacrylamide with different composition on fibroblast behavior. By appropriate modulation of the hydrogel composition (e.g. adjusting the crosslinker content), we produce and fully characterize three kinds of scaffolds with different Young modulus (E). We observe that soft hydrogels (E < 1 kPa) induced fibroblast differentiation better than stiffer ones, also in the absence of TGF-β1. This study provides a readily accessible biomaterial platform to promote Myof generation. The easy approach used and the commercial availability of the monomers make these hydrogels suitable to a wide range of biomedical applications combined with high reproducibility and simple preparation protocols.
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Affiliation(s)
- Alice Cappitti
- Department of Chemistry "Ugo Schiff", University of Florence, 50019 Sesto Fiorentino, Italy
| | - Francesco Palmieri
- Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, 50134 Florence, Italy
| | - Rachele Garella
- Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, 50134 Florence, Italy
| | - Alessia Tani
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Imaging Platform, University of Florence, 50134 Florence, Italy
| | - Flaminia Chellini
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Imaging Platform, University of Florence, 50134 Florence, Italy
| | - Martina Salzano De Luna
- Department of chemical, materials and industrial production engineering, University of Naples Federico II, 80125 Napoli, Italy
| | - Camilla Parmeggiani
- Department of Chemistry "Ugo Schiff", University of Florence, 50019 Sesto Fiorentino, Italy; European Laboratory for Non-Linear Spectroscopy (LENS), 50019 Sesto Fiorentino, Italy
| | - Roberta Squecco
- Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, 50134 Florence, Italy.
| | - Daniele Martella
- Department of Chemistry "Ugo Schiff", University of Florence, 50019 Sesto Fiorentino, Italy; European Laboratory for Non-Linear Spectroscopy (LENS), 50019 Sesto Fiorentino, Italy; Istituto Nazionale di Ricerca Metrologica (INRiM), 10135 Torino, Italy.
| | - Chiara Sassoli
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Imaging Platform, University of Florence, 50134 Florence, Italy
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12
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Hu Y, Kang M, Yin X, Cheng Y, Liu Z, Wei Y, Huang D. High biocompatible polyacrylamide hydrogels fabricated by surface mineralization for subchondral bone tissue engineering. J Biomater Sci Polym Ed 2023; 34:2217-2231. [PMID: 37368489 DOI: 10.1080/09205063.2023.2230856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 06/14/2023] [Accepted: 06/15/2023] [Indexed: 06/29/2023]
Abstract
The subchondral bone is an important part of cartilage which contains a large amount of hydroxyapatite. The mineral components of subchondral bone is the key factor which determines the biomechanical strength, and then affects the biological function of articular cartilage. Here, a mineralized polyacrylamide (PAM-Mineralized) hydrogel with good ALP activity, cell adhesion and biocompatibility was fabricated for subchondral bone tissue engineering. The micromorphology, composition and mechanical properties of PAM and PAM-Mineralized hydrogels were studied. The PAM hydrogels showed a porous structure, while the PAM-Mineralized hydrogels had well-distributed layers of hydroxyapatite mineralization on the surface. The XRD results show that the characteristic peak of hydroxyapatite (HA) was measured in PAM-Mineralized, indicating that the main component of the mineralized structure formed on the surface of the hydrogel after mineralization is HA. The formation of HA ectively decreased the rate of equilibrium swelling of the PAM hydrogel, with PAM-M reaching swelling equilibrium at 6 h. Meanwhile, compressive strength of PAM-Mineralized hydrogel (moisture state) reached 290 ± 30 kPa, compressive modulus reached 130 ± 4 kPa. PAM-Mineralized hydrogels did not affect the growth and proliferation of MC3T3-E1 cells. Surface mineralization of PAM hydrogel could significantly improve osteogenic differentiation of MC3T3-E1 cells. These results showed that PAM-Mineralized hydrogel could possess potential application in the field of subchondral bone tissue engineering.
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Affiliation(s)
- Yinchun Hu
- Research Center for Nano-Biomaterials & Regenerative Medicine, Department of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, P.R. China
| | - Min Kang
- Research Center for Nano-Biomaterials & Regenerative Medicine, Department of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
| | - Xiangfei Yin
- Research Center for Nano-Biomaterials & Regenerative Medicine, Department of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
| | - Yizhu Cheng
- Research Center for Nano-Biomaterials & Regenerative Medicine, Department of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
| | - Zexin Liu
- Research Center for Nano-Biomaterials & Regenerative Medicine, Department of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
| | - Yan Wei
- Research Center for Nano-Biomaterials & Regenerative Medicine, Department of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, P.R. China
| | - Di Huang
- Research Center for Nano-Biomaterials & Regenerative Medicine, Department of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, P.R. China
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13
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Wang Z, Li K, Gui X, Li Z. Acidovorax PSJ13, a novel, efficient polyacrylamide-degrading bacterium by cleaving the main carbon chain skeleton without the production of acrylamide. Biodegradation 2023; 34:581-595. [PMID: 37395852 DOI: 10.1007/s10532-023-10036-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 05/30/2023] [Indexed: 07/04/2023]
Abstract
Given the environmental challenge caused by the wide use of polyacrylamide (PAM), an environmental-friendly treatment method is required. This study demonstrates the role of Acidovorax sp. strain PSJ13 isolated from dewatered sludge in efficiently degrading PAM. To be specific, the strain PSJ13 can degrade 51.67% of PAM in 96 h (2.39 mg/(L h)) at 35 °C, pH 7.5 and 5% inoculation amount. Besides, scanning electron microscope, X-ray photoelectron spectroscopy, liquid chromatography-mass spectrometry and high-performance liquid chromatography were employed to analyze samples, and the nitrogen present in the degradation products was investigated. The results showed that the degradation of PAM by PSJ13 started from the side chain and then mainly the -C-C- main chain, which produced no acrylamide monomers. As the first study to report the role of Acidovorax in efficiently degrading PAM, this work may provide a solution for industries that require PAM management.
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Affiliation(s)
- Zhengjiang Wang
- Chongqing Key Lab of Soil Multi-Scale Interfacial Process, and College of Resources and Environment, Southwest University, Chongqing, 400716, China
| | - Kaili Li
- School of Chemical Engineering, The University of Queensland, Brisbane, QLD, 4067, Australia
| | - Xuwei Gui
- Chongqing Key Lab of Soil Multi-Scale Interfacial Process, and College of Resources and Environment, Southwest University, Chongqing, 400716, China
| | - Zhenlun Li
- Chongqing Key Lab of Soil Multi-Scale Interfacial Process, and College of Resources and Environment, Southwest University, Chongqing, 400716, China.
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14
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Raj PS, Bergfeld WF, Belsito DV, Cohen DE, Klaassen CD, Liebler DC, Rettie AE, Ross D, Slaga TJ, Snyder PW, Tilton S, Fiume M, Heldreth B. Polyacrylamide. Int J Toxicol 2023; 42:89S-90S. [PMID: 37766629 DOI: 10.1177/10915818231204573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/29/2023]
Abstract
The Expert Panel for Cosmetic Ingredient Safety reviewed updated information that has become available since their original assessment from 1991, along with updated information regarding product types, and frequency and concentrations of use, and reaffirmed their original conclusion that Polyacrylamide is safe as a cosmetic ingredient in the practices of use and concentration as described in this report.
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Affiliation(s)
- Preethi S Raj
- Cosmetic Ingredient Review Senior Scientific Analyst/Writer
| | | | | | | | | | | | | | - David Ross
- Expert Panel for Cosmetic Ingredient Safety Member
| | | | | | - Susan Tilton
- Expert Panel for Cosmetic Ingredient Safety Member
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15
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Zhang Z, Zhu J, Song X, Wen Y, Zhu C, Li J. Biomass-based single- and double-network hydrogels derived from cellulose microfiber and chitosan for potential application as plant growing substrate. Carbohydr Polym 2023; 319:121170. [PMID: 37567711 DOI: 10.1016/j.carbpol.2023.121170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 06/20/2023] [Accepted: 06/29/2023] [Indexed: 08/13/2023]
Abstract
A series of hydrogels were synthesized from renewable and low-cost micro-sized cellulose fiber. The single-network hydrogel was composed of cellulose fiber and a small amount of another polysaccharide, chitosan, which 'glued' individual cellulose fiber pieces together through Schiff-base bonding. The double-network hydrogel was constructed by adding a secondary network, the covalently crosslinked polyacrylamide, into the single-network hydrogel, which was synthesized by conducting Schiff-base reaction and free radical polymerization at the same time in a facile one-pot process. In both single- and double-network hydrogels, cellulose fiber constituted the dominant component. Both types of hydrogels exhibited good swelling properties. The double-network hydrogel showed much improved stability against soaking in water and higher salt tolerance. Germination experiment with choy sum seeds sowed on hydrogel surface showed that the seeds were able to germinate and further develop roots, shoots, and true leaves, demonstrating the potential of the biomass-derived hydrogels for soilless plant growing applications.
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Affiliation(s)
- Zhongxing Zhang
- Department of Biomedical Engineering, National University of Singapore, 15 Kent Ridge Crescent, Singapore 119276, Singapore; NUS Environmental Research Institute (NERI), National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Singapore
| | - Jingling Zhu
- Department of Biomedical Engineering, National University of Singapore, 15 Kent Ridge Crescent, Singapore 119276, Singapore; NUS Environmental Research Institute (NERI), National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Singapore
| | - Xia Song
- Department of Biomedical Engineering, National University of Singapore, 15 Kent Ridge Crescent, Singapore 119276, Singapore; NUS Environmental Research Institute (NERI), National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Singapore
| | - Yuting Wen
- Department of Biomedical Engineering, National University of Singapore, 15 Kent Ridge Crescent, Singapore 119276, Singapore
| | - Chenxian Zhu
- Department of Biomedical Engineering, National University of Singapore, 15 Kent Ridge Crescent, Singapore 119276, Singapore
| | - Jun Li
- Department of Biomedical Engineering, National University of Singapore, 15 Kent Ridge Crescent, Singapore 119276, Singapore; NUS Environmental Research Institute (NERI), National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Singapore.
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16
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Faridi S, Mobinikhaledi A, Moghanian H, Shabanian M. Synthesis of novel modified acrylamide copolymers for montmorillonite flocculants in water-based drilling fluid. BMC Chem 2023; 17:125. [PMID: 37743464 PMCID: PMC10518104 DOI: 10.1186/s13065-023-01042-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 09/15/2023] [Indexed: 09/26/2023] Open
Abstract
A study was conducted to treat the water-based drilling fluid through coagulation-flocculation. Innovative modified acrylamide copolymers were utilized as montmorillonite flocculants to improve drilling performance and reduce environmental contamination. A series of acrylamide copolymers was prepared by in situ free radical polymerization in aqueous medium using ammonium persulfate as a radical initiator. The chemical structure of the prepared copolymers was confirmed by FT-IR (Fourier-Transform Infrared Spectroscopy) and the polydispersity indices of the copolymers determined using gel permeation chromatography. Thermal gravimetric analysis showed that the copolymers have a very high temperature tolerance, i.e. they are stable up to 390 °C. In this paper, acrylamide copolymers were used as coagulant with cationic, anionic groups or both of them simultaneously. Consequently, in order to clarify the relationship between inhibitive properties, sedimentation volume measurement, SEM (scanning electron microscope), XRD (X-ray diffraction) and contact angle were adopted. Some factors including molecular weight and molecular chain affecting the interaction between copolymers and clay particles were analyzed. Anionic sample with the highest molecular weight can reduce the interlayer spacing of the hydrated clay to the minimum. Amphoteric sample exhibits the best performance as a coagulant in comparison with other copolymers.
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Affiliation(s)
- Shirin Faridi
- Department of Chemistry, Faculty of Science, Arak University, Arak, Iran
| | | | - Hassan Moghanian
- Materials and Energy Research Center, Dezful Branch, Islamic Azad University, Dezful, Iran
| | - Meisam Shabanian
- Faculty of Chemistry and Petrochemical Engineering, Standard Research Institute (SRI), P.O. Box 31745-139, Karaj, Iran
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17
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Matsushita T, Yamochi H, Omiya S, Koyama T, Hatano K, Matsuoka K. Proteolytic polymer: polyacrylamides functionalized with amino acids cleave bovine and human serum albumins. Bioorg Med Chem 2023; 92:117422. [PMID: 37523791 DOI: 10.1016/j.bmc.2023.117422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 07/19/2023] [Accepted: 07/21/2023] [Indexed: 08/02/2023]
Abstract
Polyacrylamides with various compositions of serine, aspartic acid, and histidine, which are the amino acids involved in the catalytic triad of natural serine protease chymotrypsin, were synthesized and their protein cleavage activity was investigated. SDS-PAGE analysis showed that some of the synthesized ternary copolymers showed cleavage activity against bovine and human serum albumins. Polyacrylamides incorporating a single type of amino acid were also able to cleave the protein substrates. These homopolymers exhibited unique cleavage profiles and pH and temperature sensitivities that differed from those of α-chymotrypsin. The results indicate the potential of polymers functionalized with amino acids as proteolytic artificial enzymes.
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Affiliation(s)
- Takahiko Matsushita
- Area for Molecular Function, Division of Material Science, Graduate School of Science and Engineering, Saitama University, Sakura, Saitama 338-8570, Japan; Medical Innovation Research Unit (MiU), Advanced Institute of Innovative Technology (AIIT), Saitama University, Sakura, Saitama 338-8570, Japan; Health Sciences and Technology Research Area, Strategic Research Center, Saitama University, Sakura, Saitama 338-8570, Japan
| | - Hinako Yamochi
- Area for Molecular Function, Division of Material Science, Graduate School of Science and Engineering, Saitama University, Sakura, Saitama 338-8570, Japan
| | - Shinzo Omiya
- Applied Chemistry Program, Graduate School of Science and Engineering, Saitama University, Sakura, Saitama 338-8570, Japan
| | - Tetsuo Koyama
- Area for Molecular Function, Division of Material Science, Graduate School of Science and Engineering, Saitama University, Sakura, Saitama 338-8570, Japan
| | - Ken Hatano
- Area for Molecular Function, Division of Material Science, Graduate School of Science and Engineering, Saitama University, Sakura, Saitama 338-8570, Japan; Medical Innovation Research Unit (MiU), Advanced Institute of Innovative Technology (AIIT), Saitama University, Sakura, Saitama 338-8570, Japan; Health Sciences and Technology Research Area, Strategic Research Center, Saitama University, Sakura, Saitama 338-8570, Japan
| | - Koji Matsuoka
- Area for Molecular Function, Division of Material Science, Graduate School of Science and Engineering, Saitama University, Sakura, Saitama 338-8570, Japan; Medical Innovation Research Unit (MiU), Advanced Institute of Innovative Technology (AIIT), Saitama University, Sakura, Saitama 338-8570, Japan; Health Sciences and Technology Research Area, Strategic Research Center, Saitama University, Sakura, Saitama 338-8570, Japan.
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18
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Millar-Haskell CS, Gleghorn JP. A Large-format Polyacrylamide Gel with Controllable Matrix Mechanics for Mammalian Cell Culture and Conditioned Media Production. Bio Protoc 2023; 13:e4807. [PMID: 37727869 PMCID: PMC10505926 DOI: 10.21769/bioprotoc.4807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 06/18/2023] [Accepted: 06/25/2023] [Indexed: 09/21/2023] Open
Abstract
Tissue culture plastic has been used for routine cell culture and in vitro experiments for over 50 years. However, cells are mechanically responsive and behave differently on hard surfaces than they do on softer substrates. Polyacrylamide gels have become a popular hydrogel of choice for controlling surface stiffness and ligand density for cell adhesion. Many synthesis methods use coverslips and small gel surface areas for cell culture, which are amenable to microscopy-based experiments. However, none of the currently published methods can be scaled up to increase the surface area to accommodate conditioned media production, high volume analyte collection, or cell line expansion. To overcome this size limitation, we developed a protocol for synthesizing polyacrylamide in glass dishes using commercially available materials. This enables routine cell culture on soft surfaces and facilitates experiments that require large amounts of analyte, especially studies involving extracellular vesicles and secreted factors.
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Affiliation(s)
| | - Jason P. Gleghorn
- Department of Biomedical Engineering, University of Delaware, Newark, DE, USA
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19
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Lin X, Liu Z, Chen R, Hou Y, Lu R, Li S, Ren S, Gao Z. A multifunctional polyacrylamide/chitosan hydrogel for dyes adsorption and metal ions detection in water. Int J Biol Macromol 2023; 246:125613. [PMID: 37392921 DOI: 10.1016/j.ijbiomac.2023.125613] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/21/2023] [Accepted: 06/27/2023] [Indexed: 07/03/2023]
Abstract
Removing noxious dyes and detecting excessive metal ions in water are both effective means to prevent damage from contaminants and ensure water safety. The emphasis problems were addressed by preparation a polyacrylamide chitosan (PAAM/CS) hydrogel. Polyacrylamide (PAAM) provides overall mechanical strength to carry loads and facilitate circulation, chitosan (CS) provides adsorption positions with high adsorption capacity. Which made that PAMM/CS hydrogel efficiently performed sorption of xylenol orange (XO). As the functional dye, XO binds to PAAM/CS and confers colorimetric properties on PAAM/CS hydrogels. XO sorbed hydrogel realized fluorescence dual-signal detection of Fe3+ and Al3+ in water. The significant swelling and adsorption potency of the hydrogel, combined with the dual-signal detection capability of XO sorbed hydrogel, make this hydrogel a versatile material for environmental applications.
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Affiliation(s)
- Xiaoxiao Lin
- Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Zesheng Liu
- Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Ruipeng Chen
- Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Yue Hou
- Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Ran Lu
- Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China
| | - Shuang Li
- Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China.
| | - Shuyue Ren
- Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China.
| | - Zhixian Gao
- Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China.
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20
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Ning W, Li Y, Fang Y, Li F, Pournajaf R, Hamawandi B. Characterization and photocatalytic activity of CoCr 2O 4/g-C 3N 4 nanocomposite for water treatment. Environ Sci Pollut Res Int 2023:10.1007/s11356-023-27807-3. [PMID: 37233934 DOI: 10.1007/s11356-023-27807-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 05/16/2023] [Indexed: 05/27/2023]
Abstract
One of the materials that has recently been used to remove environmental pollution from industrial effluents with photocatalytic technology is cobalt chromate (CoCr2O4) nanoparticles. An effective way to improve the photocatalytic properties of materials is to composite them with other photocatalysts to prevent recombination of electron-holes and accelerate the transfer of oxidation/reduction agents. Graphitic carbon nitride (g-C3N4) is an excellent choice due to its unique properties. In this research, CoCr2O4 and its composite with g-C3N4 (5, 10, and 15%) were synthesized by polyacrylamide gel method and characterized by X-ray diffraction, scanning electron microscopy, FTIR, UV-Vis spectroscopy techniques. The photocatalytic behavior of synthesized nanoparticles was investigated in the degradation process of methylene blue dye. The results showed that the composite samples have higher efficiency in photocatalytic activity than the pure CoCr2O4 sample. Using CoCr2O4-15 wt%g-C3N4 nanocomposite, after 80 min, methylene blue was completely degraded. The mechanism of degradation by CoCr2O4-g-C3N4 nanocomposite was the superoxide radical produced by the reaction of electrons with oxygen absorbed on the catalyst surface, as well as optically produced holes directly.
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Affiliation(s)
- Weiqing Ning
- College of Urban Construction, Xi'an Siyuan University, Xi'an, 710038, ShaanXi, China.
| | - Yuan Li
- College of Urban Construction, Xi'an Siyuan University, Xi'an, 710038, ShaanXi, China
| | - Yu Fang
- College of Urban Construction, Xi'an Siyuan University, Xi'an, 710038, ShaanXi, China
| | - Fang Li
- College of Urban Construction, Xi'an Siyuan University, Xi'an, 710038, ShaanXi, China
| | - Reza Pournajaf
- Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
| | - Bejan Hamawandi
- Department of Applied Physics, KTH Royal Institute of Technology, 106 91, Stockholm, Sweden
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21
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Tavakoli M, Mirhaj M, Varshosaz J, Salehi S, Mohanna SM, Salehi S, Haghighi V, Kazemi N, Mehrjoo M, Shahriari-Khalaji M. Asymmetric tri-layer sponge-nanofiber wound dressing containing insulin-like growth factor-1 and multi-walled carbon nanotubes for acceleration of full-thickness wound healing. Biomater Adv 2023; 151:213468. [PMID: 37220673 DOI: 10.1016/j.bioadv.2023.213468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 04/15/2023] [Accepted: 05/06/2023] [Indexed: 05/25/2023]
Abstract
To more closely resemble the structure of natural skin, multi-layered wound dressings have been developed. Herein, a tri-layer wound dressing was prepared containing a polyacrylamide (PAAm)-Aloe vera (Alo) sponge that had been incorporated with insulin-like growth factor-1 (IGF1) to provide a porous absorbent layer, which was able to promote angiogenesis. Alo nanofibers with multi-walled carbon nanotubes (MWCNT) were electrospun into the bottom layer to increase cell behavior, and a small film of stearic acid was put as a top layer to avoid germy penetration. In comparison to bilayer dressing, the tensile strength increased by 17.0 % (from 0.200 ± 0.010 MPa to 0.234 ± 0.022 MPa) and the elastic modulus by 45.6 % (from 0.217 ± 0.003 MPa to 0.316 ± 0.012 MPa) in the presence of Alo nanofibers containing 0.5 wt% of MWCNT at the bottom layer of Trilayer0.5 dressing. The release profile of IGF1, the antibacterial activity and the degradability of different wound dressings were investigated. Trilayer0.5 indicated the highest cell viability, cell adhesion and angiogenic potential among the prepared dressing materials. In-vivo rat model revealed that the Trilayer0.5 dressing treated group had the highest rate of wound closure and wound healing within 10 days compared to other groups.
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Affiliation(s)
- Mohamadreza Tavakoli
- Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Marjan Mirhaj
- Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Jaleh Varshosaz
- Department of Pharmaceutics, Novel Drug Delivery Systems Research Centre, School of Pharmacy, Isfahan University of Medical Sciences, Isfahan, Iran.
| | - Saeideh Salehi
- Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
| | - Seyedhosein Mirjalili Mohanna
- Department of Mechanical Engineering, Faculty of Engineering, The University of Sheffield, Sheffield, United Kingdom
| | - Sepideh Salehi
- Department of Medicine, Ernst Moritz Arndt University of Greifswald, Greifswald, Germany
| | - Vida Haghighi
- Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Nafise Kazemi
- Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
| | - Morteza Mehrjoo
- Department of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran; Iran National Cell Bank, Pasteur Institute of Iran, Tehran, Iran
| | - Mina Shahriari-Khalaji
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
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22
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Yang Y, Huang F, Wei Z, Wang Y, Lu T, Zheng B, Xia J. Experimental study on dynamic behavior of polyacrylamide-reinforced tailings. Environ Sci Pollut Res Int 2023; 30:47274-47288. [PMID: 36738417 DOI: 10.1007/s11356-023-25680-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 01/29/2023] [Indexed: 06/18/2023]
Abstract
Earthquakes are a significant factor that contributes to tailings dam failure. Generally, the seismic stability of a tailings dam can be increased by improving the dynamic properties of tailings. The dynamic properties of tailings can be improved effectively using polymers. In this study, the dynamic properties of polyacrylamide-reinforced tailings were investigated via a sequence of dynamic triaxial tests. The content of polyacrylamide in the test sample was 0.3%. Test results show that the cyclic liquefaction resistance, initial dynamic shear modulus, dynamic shear modulus, and dynamic shear modulus ratio of polyacrylamide-reinforced tailings were slightly greater than those of unreinforced tailings. The damping ratio of polyacrylamide-reinforced tailings was lower than that of unreinforced tailings when the dynamic shear strain exceeded 0.038%. The increase in the dynamic pore water pressure of polyacrylamide-reinforced tailings during cyclic loading decelerated significantly compared with that of unreinforced tailings. The revised Zeng model can effectively described the changes in dynamic pore-water pressure of unreinforced and polyacrylamide-reinforced tailings. The polyacrylamide can improve the structural stability of the tailings specimen and also improve the dynamic properties of the tailings, thereby enhancing the seismic stability of the tailings dam.
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Affiliation(s)
- Yonghao Yang
- State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing, 400074, China.
- School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, China.
| | - Feng Huang
- State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
- School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Zuoan Wei
- School of Resources and Safety Engineering, Chongqing University, Chongqing, 400044, China
| | - Yanlei Wang
- Chongqing Bureau of Geology and Minerals Exploration, Chongqing, 401121, China
| | - Ting Lu
- School of Resources and Safety Engineering, Chongqing University, Chongqing, 400044, China
| | - Binbin Zheng
- School of Management Science and Engineering, Shandong Technology and Business University, Yantai Shandong, 264005, China
| | - Jiang Xia
- State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
- School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
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23
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Abulaiti A, She D, Liu Z, Sun X, Wang H. Application of biochar and polyacrylamide to revitalize coastal saline soil quality to improve rice growth. Environ Sci Pollut Res Int 2023; 30:18731-18747. [PMID: 36219298 PMCID: PMC9552741 DOI: 10.1007/s11356-022-23511-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 10/04/2022] [Indexed: 06/16/2023]
Abstract
Poor soil quality is affected by salinity, which limits land productivity and sustainable agricultural development in coastal China. Hence, it is essential to choose suitable and efficient approaches to revitalize coastal saline soil quality and improve agricultural productivity. Biochar and polyacrylamide (PAM) have been widely applied as soil amendments to enhance soil structure, but the interactive effects of biochar and PAM on rice growth are unclear. The experiment described in this study was conducted over five consecutive growing seasons (from 2016 to 2020) with biochar (at 0, 32, and 79 t/hm2) and PAM (at 0, 0.6, and 1.6 t/hm2) applications to study the effects of amendments on soil properties, rice photosynthesis, and rice yield in coastal saline land. The soil property results showed that wheat straw biochar and PAM lowered soil total salt and bulk density, but increased the soil organic matter (SOM), mean weight diameter of water-stable aggregates (MWD), and macroaggregate (> 0.25 mm) content. The application of either biochar or PAM increased the rice net photosynthetic rate, transpiration rate, and stomatal conductance. The combined application of 32 t/hm2 biochar + 0.6 t/hm2 PAM increased the net photosynthetic rate by 26.0% and the transpiration rate by 24.8% relative to the control. The application of 32 t/hm2 biochar and 1.6 t/hm2 PAM significantly increased the rice grain yield. The path analysis model showed that spikelets per panicle and canopy gross photosynthesis had strong and significant positive effects on grain yield, whereas soil total salt had a negative effect on grain yield. The combined application of 32 t/hm2 biochar + 0.6 t/hm2 PAM was identified as the most effective for rice growth. Biochar and PAM amendments at an optimal level may enhance soil properties by reducing salinity. These findings indicate that biochar and PAM have the potential to remediate coastal saline soil quality and the environment, which would simultaneously increase the sustainable use of coastal land resources and food production to preserve the ecological environment.
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Affiliation(s)
- Alimu Abulaiti
- College of Agricultural Science and Engineering, Hohai University, Nanjing, 211100, China
- Jiangsu Province Engineering Research Center for Agricultural Soil-Water Efficient Utilization, Carbon Sequestration and Emission Reduction, Nanjing, 211100, China
| | - Dongli She
- College of Agricultural Science and Engineering, Hohai University, Nanjing, 211100, China.
- Jiangsu Province Engineering Research Center for Agricultural Soil-Water Efficient Utilization, Carbon Sequestration and Emission Reduction, Nanjing, 211100, China.
| | - Zhipeng Liu
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xiaoqin Sun
- College of Agricultural Science and Engineering, Hohai University, Nanjing, 211100, China
- Jiangsu Province Engineering Research Center for Agricultural Soil-Water Efficient Utilization, Carbon Sequestration and Emission Reduction, Nanjing, 211100, China
| | - Hongde Wang
- College of Agricultural Science and Engineering, Hohai University, Nanjing, 211100, China
- Jiangsu Province Engineering Research Center for Agricultural Soil-Water Efficient Utilization, Carbon Sequestration and Emission Reduction, Nanjing, 211100, China
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24
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Jiang R, Shen TT, Zhu HY, Fu YQ, Jiang ST, Li JB, Wang JL. Magnetic Fe 3O 4 embedded chitosan-crosslinked- polyacrylamide composites with enhanced removal of food dye: Characterization, adsorption and mechanism. Int J Biol Macromol 2023; 227:1234-1244. [PMID: 36464188 DOI: 10.1016/j.ijbiomac.2022.11.310] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/23/2022] [Accepted: 11/29/2022] [Indexed: 12/03/2022]
Abstract
The water solubility in acid solution, relative low adsorption capacities and unsatisfactory separation performance limit application of traditional chitosan-based adsorbents in wastewater treatment. To break the limitation, a hydrophilic magnetic Fe3O4 embedded chitosan-crosslinked-polyacrylamide composites (abbreviated as m-CS-c-PAM) were prepared by a two-step method. The m-CS-c-PAM composites were systematically characterized using SEM, XRD, FTIR, VSM, TGA and BET. Sunset yellow (SY) was selected as model food dye to investigate adsorption kinetics and thermodynamic parameters of food dye adsorption onto m-CS-c-PAM. Compared with magnetic Fe3O4/chitosan, m-CS-c-PAM can adapt to a wider range of pH (2-10) and resist the presence of inorganic salts. m-CS-c-PAM was proved to have high adsorption capacity (359.71 mg g-1) for SY dye at 298 K, much higher than magnetic Fe3O4/chitosan and many reported adsorbents. Moreover, m-CS-c-PAM could be rapidly and efficiently separated from treated solution within 15 s by an external magnet and regenerated by NaOH solution. With its excellent adsorption capacity, pH-independent adsorption capability for food dye, easy and convenient separation ability, satisfactory reusability, m-CS-c-PAM can be a promising material for food wastewater treatment.
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Affiliation(s)
- Ru Jiang
- Department of Environmental Engineering, Taizhou University, Taizhou 318000, Zhejiang, China; Taizhou Key Laboratory of Biomass Functional Materials Development and Application, Taizhou University, Taizhou 318000, Zhejiang, China; Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, Zhejiang 318000, China
| | - Ting-Ting Shen
- Department of Environmental Engineering, Taizhou University, Taizhou 318000, Zhejiang, China
| | - Hua-Yue Zhu
- Department of Environmental Engineering, Taizhou University, Taizhou 318000, Zhejiang, China; Taizhou Key Laboratory of Biomass Functional Materials Development and Application, Taizhou University, Taizhou 318000, Zhejiang, China; Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, Zhejiang 318000, China.
| | - Yong-Qian Fu
- Taizhou Key Laboratory of Biomass Functional Materials Development and Application, Taizhou University, Taizhou 318000, Zhejiang, China; Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, Zhejiang 318000, China
| | - Sheng-Tao Jiang
- Department of Environmental Engineering, Taizhou University, Taizhou 318000, Zhejiang, China; Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, Zhejiang 318000, China
| | - Jian-Bing Li
- Environmental Engineering Program, University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada
| | - Jian-Ling Wang
- Department of Environmental Engineering, Taizhou University, Taizhou 318000, Zhejiang, China
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25
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Park KY, Odde DJ, Distefano MD. Photoresponsive Hydrogels for Studying Mechanotransduction of Cells. Methods Mol Biol 2023; 2600:133-53. [PMID: 36587095 DOI: 10.1007/978-1-0716-2851-5_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Hydrogels are important platform materials for in vitro cellular studies. Mechanistic studies on durotaxis, the directional movement of a cell affected by a spatial gradient of stiffness of the underlying substrate, requires materials such as polyacrylamide, polyethylene glycol, or PDMS, in which the stiffness can be controlled in a spatiotemporal manner. Here, we describe the synthesis of an o-nitrobenzyl-based photocleavable cross-linker and its incorporation into a polyacrylamide hydrogel to render it photoresponsive. Precise control over the physical properties of the gel allows observation of glioblastoma durotaxis under surface stiffness conditions relevant to the actual brain environment.
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26
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Bhattacharjee P, Ahearne M. Silk fibroin based interpenetrating network hydrogel for corneal stromal regeneration. Int J Biol Macromol 2022; 223:583-94. [PMID: 36356877 DOI: 10.1016/j.ijbiomac.2022.11.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 11/02/2022] [Accepted: 11/03/2022] [Indexed: 11/09/2022]
Abstract
There is a need to develop tissue engineering based approaches to address the shortage of donor corneas worldwide for transplantation. To do this a novel approach to fabricate three-dimensional hydrogels using free-radical polymerization was investigated to generate constructs for corneal stromal tissue regeneration. Different ratios of silk fibroin (SF) to polyacrylamide (PA) were used to fabricate semi-interpenetrating hydrogels. Scanning electron micrograph displayed the interconnectivity of pores within the fabricated hydrogels. Pore sizes ranged from 25 to 66 μm. Scaffolds with increasing concentration of SF had enhanced β-sheet structure (verified by Fourier transform infrared spectroscopy). The biological response of human corneal stromal cells to these hydrogels was examined using cellular adhesion, proliferation, cytoskeleton organization, gene expression and immunocytochemical analysis. The fabricated hydrogels possess rapid gelation (∼3 min) at 37 °C, 84 % porosity facilitating keratocyte migration during healing, improved cellular adhesion and no cytotoxicity, indicating their efficiency for in-situ corneal tissue regeneration. Presence of SF in semi-interpenetrating network hydrogel enhanced cellular proliferation, elevated GAG deposition, and increased expression of keratocyte genes, normally associated with healthy corneal stromal tissue. This study acts as an initial step towards fabricating SF based semi-interpenetrating network hydrogels for developing clinically applicable ocular implants.
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27
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Mirhaj M, Salehi S, Tavakoli M, Varshosaz J, Labbaf S, Abadi SAM, Haghighi V. Comparison of physical, mechanical and biological effects of leucocyte-PRF and advanced-PRF on polyacrylamide nanofiber wound dressings: In vitro and in vivo evaluations. Biomater Adv 2022; 141:213082. [PMID: 36067641 DOI: 10.1016/j.bioadv.2022.213082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 07/21/2022] [Accepted: 08/11/2022] [Indexed: 12/22/2022]
Abstract
Platelet-rich fibrin (PRF) is extracted from the blood without biochemical interference and, also, with the ability of a long-term release of growth factors that can stimulate tissue repair and regerenation. Here, leucocyte- and platelet-rich fibrin (L-PRF) and advanced platelet-rich fibrin (A-PRF) were extracted and utilized for the creation of nanofibers containing polyacrylamide (PAAm), PAAm / L-PRF and PAAm / A-PRP through electrospinning processing technique. The effect of the type of PRF on the physical, mechanical and biological properties of the resultant nanofiberous wound dressings are thoroughly evaluated. The results presented in the current study reveals that the fiber diameter is grealtly reduced through the utilization of L-PRF. In addition, mechanical property is also positively affected by L-PRF and the degradation rate is found to be higher compared to A-PRF group. The L929 cells proliferation and adhesion, angiogenesis potential and wound healing ability was significantly higher in PAAm/A-PRF nanofibers compared to pure PAAm and PAAm/L-PRF nanofibers owed to the release of vascular endothelial growth factor (VEGF) and platelet derived growth factor (PDGF). Overall, the utilization of L-PRF or A-PRF can improve the physical, mechanical and biological behavior of nanofiber making them an ideal candidate for wound dressings, with the emphasis on the skin tissue repair and regeneration applications.
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28
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Kang MW, Yibeltal M, Kim YH, Oh SJ, Lee JC, Kwon EE, Lee SS. Enhancement of soil physical properties and soil water retention with biochar-based soil amendments. Sci Total Environ 2022; 836:155746. [PMID: 35525368 DOI: 10.1016/j.scitotenv.2022.155746] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 04/20/2022] [Accepted: 05/02/2022] [Indexed: 06/14/2023]
Abstract
The soil physical properties are deteriorating due to changing rainfall patterns and intensities, as well as climate change-induced temperature fluctuations. Pot experiments were carried out to examine the impacts of synthesized soil amendments on soil water retention and plant growth. Soil amendments (biochar, polyacrylamide (PAM), and moringa) were used at different rates (0 (control), 2.1, 4.2, and 8.3 g kg-1) to improve the physical properties of the soil. As a result of soil amendment application, it was found that the mean weight diameter of soil aggregate increased by 188% during the 8.3 g kg-1 treatment, forming stable soil particles. Soil water retention improved by up to 128.9% during the 8.3 g kg-1 treatment, and it was analyzed that it was due to the high surface area of biochar, porosity, and high molecular weight of PAM. Pellet treatment increased all plant growth parameters (height, stem diameter, leaf number, and fresh and dry weight) for both beans and maize. The dry weight of beans (C3 plant) and maize (C4 plant) increased by 92.9 and 146.4%, respectively in an 8.3 g kg-1 pot. The soil physical condition was stabilized by the high carbon content of biochar and the improvement of soil coagulation between PAM and moringa. This had a positive effect on the C4 plant. The findings of this study indicate that if the soil amendments are properly mixed and applied based, they will improve soil stability and plant productivity.
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Affiliation(s)
- Min Woo Kang
- Department of Environmental & Energy Engineering, Yonsei University, Wonju 26493, Republic of Korea
| | - Mesenbet Yibeltal
- Department of Environmental & Energy Engineering, Yonsei University, Wonju 26493, Republic of Korea; Faculty of Civil and Water Resource Engineering, Bahir Dar Institute of Technology, Bahir Dar University, P.O. Box 26, Bahir Dar, Ethiopia
| | - Young Hyun Kim
- Department of Environmental & Energy Engineering, Yonsei University, Wonju 26493, Republic of Korea
| | - Se Jin Oh
- Department of Environmental & Energy Engineering, Yonsei University, Wonju 26493, Republic of Korea
| | - Jong Cheol Lee
- Department of Environmental & Energy Engineering, Yonsei University, Wonju 26493, Republic of Korea
| | - Eilhann E Kwon
- Department of Earth Resources and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea.
| | - Sang Soo Lee
- Department of Environmental & Energy Engineering, Yonsei University, Wonju 26493, Republic of Korea.
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29
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Lin T, Li S, Hu Y, Sheng L, Chen X, Que X, Peng J, Ma H, Li J, Zhai M. Ultrastretchable and adhesive agarose/Ti 3C 2T x-crosslinked- polyacrylamide double-network hydrogel for strain sensor. Carbohydr Polym 2022; 290:119506. [PMID: 35550781 DOI: 10.1016/j.carbpol.2022.119506] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 04/15/2022] [Accepted: 04/16/2022] [Indexed: 11/27/2022]
Abstract
A novel agarose/Ti3C2Tx-crosslinked-polyacrylamide (AG/T-PAM) double-network (DN) hydrogel is synthesized by combining heating-cooling and γ-ray radiation-induced polymerization. The AG/T-PAM DN hydrogel possesses excellent mechanical properties with 4250% stretchability, and good adhesion to different substrates, such as an adhesive strength of 1148 kPa to copper at 30 °C. The resultant hydrogel also exhibits excellent tensile and compression sensing properties due to the variation of conductive network within hydrogel. The flexible and wearable strain sensor composed of the AG/T-PAM DN hydrogel presents rapid response to strain withstand 1000 cycles, and can monitor various movements of human body with a high sensibility. The AG/T-PAM DN hydrogel-based strain sensor will have broad application in large-scale strain detection scenarios requiring high sensitivity and adhesion.
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Affiliation(s)
- Tingrui Lin
- Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China; Fujian Key Laboratory of Architectural Coating, Skshu Paint Co., Ltd., 518 North Liyuan Avenue, Licheng District, Putian, Fujian 351100, China
| | - Shuangxiao Li
- Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yang Hu
- Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Lang Sheng
- Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xibang Chen
- Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China; Institute of Chemical Defense, Beijing 100191, China
| | - Xueyan Que
- Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Jing Peng
- Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
| | - Huiling Ma
- School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
| | - Jiuqiang Li
- Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Maolin Zhai
- Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
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30
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Sha S, Rui X, Xu Y, Gao Y, Lee CT, Li C. Enhanced precipitation performance for treating high-phosphorus wastewater using novel magnetic seeds from coal fly ash. J Environ Manage 2022; 315:115168. [PMID: 35525047 DOI: 10.1016/j.jenvman.2022.115168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 04/22/2022] [Accepted: 04/23/2022] [Indexed: 06/14/2023]
Abstract
Magnetic coagulation is a promising approach for treating high phosphorous (high-P) wastewater by enhancing precipitation efficiency using magnetic particles. In this study, a cost-effective and environmentally friendly magnetic seed from coal fly ash (MS-CFA) was used as an alternative material for Fe3O4 magnetic seed (MS) coagulation. The potential effect of MS-CFA was explored to reduce the settling time and the dosage of coagulant aid of polyacrylamide (PAM) in treating high-phosphorous (high-P) simulated wastewater at 100 and 200 mg P/L. The physicochemical characteristics of MS-CFA were analysed through particle size distribution (20-100 μm), pore size distribution (14-30 nm), specific surface area (1.654 m2/g), X-ray diffraction (XRD), specific gravity (4.2), and magnetic induction intensity (49.8 emu/g). The characteristics met the requirements as magnetic coagulation material. MS-CFA was combined with polyaluminum chloride (PAC) and polyacrylamide (PAM) to improve phosphorous precipitation performance. The synergised magnetic coagulation effect using MS-CFA and PAM reduced the settling time of flocs to less than 1 min due to the high specific gravity. This represents a reduction of 90% of the settling time compared to the control using PAM alone (15 min) without MS-CFA. MS-CFA efficiently reduced PAM dosage by 83% and 87% for treating 100 and 200 mg P/L, respectively. The presence of PAM (1 mg/L for 100 mg P/L and 2 mg/L for 200 mg P/L) was imperative for binding the MS-CFA and flocs, hence increasing the particle size of the magnetic flocs. The characteristics of the magnetic flocs were analysed through microscopy, particle size distribution, zeta potential measurements, and magnetic induction intensity. The characteristics of the magnetic flocs confirmed that MS-CFA could be an alternative material for Fe3O4 as the magnetic seeds in the magnetic coagulation process for treating high-P wastewater.
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Affiliation(s)
- Sha Sha
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Xuan Rui
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Yushu Xu
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Yueshu Gao
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Chew Tin Lee
- School of Chemical & Energy Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, 81310, Malaysia
| | - Chunjie Li
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.
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31
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Clifford AM, Jasinska EJ, Meints J, Hanna J, Goss GG. Hypoxemia as the mechanism of acute cationic polymer toxicity in rainbow trout and prevention of toxicity using an anionic neutralizing polymer. Aquat Toxicol 2022; 248:106198. [PMID: 35605491 DOI: 10.1016/j.aquatox.2022.106198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 05/13/2022] [Accepted: 05/14/2022] [Indexed: 06/15/2023]
Abstract
Industrial operations such as surface mining, road building, and aggregate washing result in high concentrations of suspended particles (Total Suspended Solids; TSS) in surface waters which must be treated prior to discharge into fish-bearing waters. A common industrial practice is to add flocculants to improve the efficacy and speed of TSS sedimentation. A significant environmental issue even small amounts of uncomplexed cationic polymer coagulant/flocculant remaining in treated water is highly toxic to fish at very low concentrations (LC50 ∼ 0.3 mg L-1). Fingerling trout (Oncorhynchus mykiss) were exposed to (1) a cationic flocculant (Water Lynx 800 (WL800), (2) a Clearflow neutralizing polymer (CN369), and (3) a combination of WL800 and CN369 at various ratios with measured LC50 as an index of toxicity. Acute toxicity was entirely reversed by addition of the neutralizing polymer at WL800:CN369 ratios >1:1.5 mg/L. Furthermore, we demonstrate that the proximal mechanism of acute cationic polymer toxicity is hypoxemia due to accumulation of polymer on the gill epithelia rather than gill damage. Exposure of 0.5 mg/L WL800 reduced oxygen consumption by >50% reduction by 12 h and this was accompanied by significantly increased blood, brain, and liver [lactate] and [glucose]. The development of an inexpensive amelioration technique preventing cationic polymer toxicity is a significant advancement in surface and industrial water treatment to prevent cationic polymer mediated fish kills.
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Affiliation(s)
- Alexander M Clifford
- Department of Biological Sciences, University of Alberta, 116 St. and 85 Ave., Edmonton, Alberta, T6G 2R3, Canada; Clearflow Group, 134 Pembina Rd Unit 140, Sherwood Park, Alberta, Canada T8H 0M2
| | - Edyta J Jasinska
- Department of Biological Sciences, University of Alberta, 116 St. and 85 Ave., Edmonton, Alberta, T6G 2R3, Canada; Clearflow Group, 134 Pembina Rd Unit 140, Sherwood Park, Alberta, Canada T8H 0M2
| | - Jesse Meints
- Clearflow Group, 134 Pembina Rd Unit 140, Sherwood Park, Alberta, Canada T8H 0M2
| | - Jerry Hanna
- Clearflow Group, 134 Pembina Rd Unit 140, Sherwood Park, Alberta, Canada T8H 0M2
| | - Greg G Goss
- Department of Biological Sciences, University of Alberta, 116 St. and 85 Ave., Edmonton, Alberta, T6G 2R3, Canada.
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32
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Palma-Chavez J, Wear KA, Mantri Y, Jokerst JV, Vogt WC. Photoacoustic imaging phantoms for assessment of object detectability and boundary buildup artifacts. Photoacoustics 2022; 26:100348. [PMID: 35360521 PMCID: PMC8960980 DOI: 10.1016/j.pacs.2022.100348] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 02/18/2022] [Accepted: 03/17/2022] [Indexed: 05/05/2023]
Abstract
Standardized phantoms and test methods are needed to accelerate clinical translation of emerging photoacoustic imaging (PAI) devices. Evaluating object detectability in PAI is challenging due to variations in target morphology and artifacts including boundary buildup. Here we introduce breast fat and parenchyma tissue-mimicking materials based on emulsions of silicone oil and ethylene glycol in polyacrylamide hydrogel. 3D-printed molds were used to fabricate solid target inclusions that produced more filled-in appearance than traditional PAI phantoms. Phantoms were used to assess understudied image quality characteristics (IQCs) of three PAI systems. Object detectability was characterized vs. target diameter, absorption coefficient, and depth. Boundary buildup was quantified by target core/boundary ratio, which was higher in transducers with lower center frequency. Target diameter measurement accuracy was also size-dependent and improved with increasing transducer frequency. These phantoms enable evaluation of multiple key IQCs and may support development of comprehensive standardized test methods for PAI devices.
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Affiliation(s)
- Jorge Palma-Chavez
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Keith A. Wear
- Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD 20993, USA
| | - Yash Mantri
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Jesse V. Jokerst
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
- Department of Radiology, University of California San Diego, La Jolla, CA 92093, USA
- Material Science Program, University of California San Diego, La Jolla, CA 92093, USA
- Corresponding author at: Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA.
| | - William C. Vogt
- Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD 20993, USA
- Corresponding author.
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Song X, Guo J, Liu Y, Li F, Yang Q, Guan F, Di C. Preparation and characterization of multi-network hydrogels based on sodium alginate/krill protein/ polyacrylamide-Strength, shape memory, conductivity and biocompatibility. Int J Biol Macromol 2022; 207:140-151. [PMID: 35257727 DOI: 10.1016/j.ijbiomac.2022.03.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/17/2022] [Accepted: 03/03/2022] [Indexed: 11/18/2022]
Abstract
Sodium alginate/krill protein/polyacrylamide (SA/AKP/PAM) hydrogel with "covalent bond-ion complex-hydrogen bond" multi-network structure was prepared by covalent cross-linking and complexion ion crosslinking using SA, AKP, and acrylamide (AM) as raw materials. The effects of ion species (Fe3+, Ba2+, Sr2+, Ca2+, and Zn2+) on the structure, morphology, and properties of multi-network hydrogels were studied in detail. The results showed that the mechanical strength of ionic cross-linked hydrogels increased significantly. The compressive strength of Fe3+ cross-linked hydrogels was 5.56 MPa, 16.13 times that of non-ionic crosslinked hydrogels. The results of ionic conductivity measurements showed that hydrogels had significant ionic conductivity and were sensitive to external forces. Interestingly, the hydrogel can be used as a capacitive pen in mobile phone writing, painting and dialing numbers. Moreover, ionic cross-linked hydrogels had a unique three-dimensional porous structure with gradient distribution, excellent shape memory effect, and good biocompatibility. Fe3+, Ba2+, Sr2+, and Ca2+ cross-linked hydrogels were nontoxic and conducive to the adhesion and growth of Schwann cells. These excellent properties of ionic cross-linked SA/AKP/PAM hydrogels have broad applications prospects in flexible electronic devices, sensors, soft electronic skins, and tissue engineering.
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Affiliation(s)
- Xuecui Song
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, PR China
| | - Jing Guo
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, PR China; Liaoning Engineering Technology Research Centre of Function Fiber and its Composites, Dalian 116034, PR China.
| | - Yuanfa Liu
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, PR China
| | - Feng Li
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, PR China
| | - Qiang Yang
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, PR China
| | - Fucheng Guan
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, PR China.
| | - Chunqiu Di
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, PR China
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Mahmoudabadi ZS, Rashidi A, Maklavany DM. Optimizing treatment of alcohol vinasse using a combination of advanced oxidation with porous α-Fe 2O 3 nanoparticles and coagulation-flocculation. Ecotoxicol Environ Saf 2022; 234:113354. [PMID: 35247711 DOI: 10.1016/j.ecoenv.2022.113354] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 02/17/2022] [Accepted: 02/23/2022] [Indexed: 06/14/2023]
Abstract
This study utilizes a novel method, namely the combination of advanced oxidation processes with synthesized highly porous α-Fe2O3 nanoparticles and coagulation-flocculation with polyacrylamide, to investigate the effects on COD removal in alcohol vinasse. Highly porous α-Fe2O3 nanoparticles were prepared via a chemical precipitation technique. The characteristic of the synthesized α-Fe2O3 nanoparticles were determined by FT-IR, Raman spectroscopy, XRD, SEM, and N2 adsorption-desorption isotherms. The effect of different α-Fe2O3 nanoparticles loading for chemical oxygen demand (COD) removal efficiency was investigated. The results revealed that at α-Fe2O3 nanoparticle dose of 3000 ppm had the highest COD removal for vinasse. Then, central composite design (CCD) was used to optimize the operating variables such as pH, time, oxidant dosage, and coagulant dosage, and their optimum values were determined to be pH:7.36, 90 min, 17.89 wt% oxidant dosage, and 1.6 wt% coagulant dosage, to achieve a high COD removal efficiency in 70 ℃ for alcohol vinasse (98.64%). Based on optimal conditions, the porous α-Fe2O3 nanoparticles possess superior catalytic activity in the advanced oxidation process compared to other treating methods. Also, the mechanism of the catalytic oxidation reaction is evaluated.
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Affiliation(s)
- Zohal Safaei Mahmoudabadi
- Carbon & Nanotechnology Research Center, RIPI, Tehran, Iran; School of Chemistry, College of Science, University of Tehran, Tehran, Iran
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35
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Zhu M, Lu D, Milani AH, Mahmoudi N, King SM, Saunders BR. Comparing pH-responsive nanogel swelling in dispersion and inside a polyacrylamide gel using photoluminescence spectroscopy and small-angle neutron scattering. J Colloid Interface Sci 2022; 608:378-385. [PMID: 34626983 DOI: 10.1016/j.jcis.2021.09.163] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 09/18/2021] [Accepted: 09/26/2021] [Indexed: 10/20/2022]
Abstract
Nanosized probes that report their changes in dimensions within networks in response to environmental stimuli are potentially important for applications such as drug delivery, load-supporting hydrogels and soft robotics. Recently, we developed a fluorescent pH-responsive nanogel (NG) that used Förster-resonance energy transfer (FRET) to report changes in the probe separation and NG swelling within hydrogels using photoluminescence (PL) spectroscopy. However, FRET cannot measure nanoparticle dimensions and is subject to artefacts. Here, we report the use of small-angle neutron scattering (SANS) to study both the NGs in dispersion and in polyacrylamide (PAAm) gels as a function of pH. We compare the PL and SANS data for both systems and as a function of pH. The SANS data for the dispersed NGs indicate that they have a core-shell structure with a swollen mesh size of ∼1.0 nm. We hypothesized that the NGs inside the PAAm gel would show the same general changes in scattering as the pH is increased, as observed for the dispersed NGs, and this is confirmed by the data. In summary, the data confirm that PL is a suitable (accessible) method for reporting internal environmental changes within gels using NG probes.
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Affiliation(s)
- Mingning Zhu
- School of Materials, University of Manchester, MSS Tower, Manchester M13 9PL, UK
| | - Dongdong Lu
- School of Materials, University of Manchester, MSS Tower, Manchester M13 9PL, UK
| | - Amir H Milani
- School of Materials, University of Manchester, MSS Tower, Manchester M13 9PL, UK
| | - Najet Mahmoudi
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, UK
| | - Stephen M King
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, UK
| | - Brian R Saunders
- School of Materials, University of Manchester, MSS Tower, Manchester M13 9PL, UK
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Aslan F, Baybaş D, Ulusoy U. Lignin grafted hydroxyapatite entrapped in polyacrylamide: Characterization and adsorptive features for Th 4+ and bovine serum albumin. Int J Biol Macromol 2022; 204:333-344. [PMID: 35131231 DOI: 10.1016/j.ijbiomac.2022.01.200] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 01/21/2022] [Accepted: 01/31/2022] [Indexed: 11/15/2022]
Abstract
Water-soluble sulfolignin (SL) was grafted onto hydroxyapatite (Hap) by using epichlorohydrin. SLgHap was then entrapped in cross-linked polyacrylamide by in situ polymerizations of acrylamide and N, N'-methylenebisacrylamide to obtain the composite of PSLgHap. The composite was characterized by FT-IR, BET- porosity, XRD, EDXRF, SEM-EDX, TGA-DTG, PZC, CEC, and swelling tests. The adsorptive features of PSLgHAP were investigated for Th4+ and BSA in view of its dependence on pH, ionic intensity, concentration, temperature, and time. The results of characterization tests confirmed the formation of PSLgHap. The grafting efficiency concerning sulfur contents of PSLgHap was 96% by EDXRF. The isotherms were best represented by the Sips model, Langmuir adsorption capacities were 369 and 390 mg gSLgHap-1 for BSA and Th4+. The enthalpy and entropy changes were positive whilst Gibbs energy was negative by entropy controlled. The adsorption kinetics of both species was obeyed to pseudo second-order model, whereas it was first-order for BSA and hybrid-order for Th4+ of Langmuir model.
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Affiliation(s)
- Fuat Aslan
- Sivas Cumhuriyet University, Science Faculty, Chemistry Department, Sivas 58140, Turkey.
| | - Demet Baybaş
- Sivas Cumhuriyet University, Science Faculty, Biochemistry Department, Sivas 58140, Turkey.
| | - Ulvi Ulusoy
- Sivas Cumhuriyet University, Science Faculty, Chemistry Department, Sivas 58140, Turkey.
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37
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Sun X, Miao L, Chen R, Wang H, Xia J. Surface rainfall erosion resistance and freeze-thaw durability of bio-cemented and polymer-modified loess slopes. J Environ Manage 2022; 301:113883. [PMID: 34601348 DOI: 10.1016/j.jenvman.2021.113883] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 09/16/2021] [Accepted: 09/28/2021] [Indexed: 06/13/2023]
Abstract
Microbially induced calcite precipitation (MICP) has been shown to mitigate sand erosion; however, few studies have applied MICP on loess soils. In this study, polyacrylamide (PAM) was added to the cementation solution, and combined MICP-PAM treatment was applied to improve the surface erosion resistance of loess-slopes. The freeze-thaw (FT) durability of MICP-PAM treated loess slopes was also studied. The obtained results showed that MICP-PAM treatment improved erosion resistance and addition of 1.5 g/L PAM achieved the best erosion control and highest surface strength. The high erosion resistance of MICP-PAM treated slopes could be attributed to the stable spatial structure of precipitation, and PAM addition conveyed stronger resistance to tension or shear force. With increasing number of FT cycles, the surface strength of MICP-PAM treated loess slopes decreased; however, slopes subjected to 12 FT cycles still only lost little soil. In MICP-PAM treated loess slopes, cracks and pores evolved with increasing number of FT cycles. With increasing number of FT cycles, porosity and fractal dimension increased, pore ellipticity decreased slightly, and the percentage of various pores changed slightly. The number of FT cycles had less effect on MICP-PAM treated loess slopes than on untreated slopes. MICP-PAM treatment significantly mitigated surface erosion of loess-slopes and improved FT weathering resistance, thus presenting promising potential for application in the field. In addition, based on the linear correlations between surface strength and rainfall-erosion resistance, surface strength could be measured to evaluate the rainfall-erosion resistance for MICP-PAM treated slopes in practical engineering applications.
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Affiliation(s)
- Xiaohao Sun
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong.
| | - Linchang Miao
- Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu, 210096, China.
| | - Runfa Chen
- Beijing Urban Construction Group Co. Ltd, Beijing, 210096, China.
| | - Hengxing Wang
- Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu, 210096, China.
| | - Jingxin Xia
- School of Transportation, Southeast University, Nanjing, Jiangsu, 210096, China.
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38
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Tajik M, Jalali Torshizi H, Resalati H, Hamzeh Y. Effects of cellulose nanofibrils and starch compared with polyacrylamide on fundamental properties of pulp and paper. Int J Biol Macromol 2021; 192:618-626. [PMID: 34626728 DOI: 10.1016/j.ijbiomac.2021.09.199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 09/24/2021] [Accepted: 09/28/2021] [Indexed: 10/20/2022]
Abstract
Bio-based additives received significant attention in pulp and paper properties improvement. For this, the most cited biochemical Cellulose Nano Fibrils (CNFs) and Cationic Starch (CS) were experimentally compared with the most declared synthetic chemical, Cationic Polyacrylamide (CPAM). SEM images showed better paper surface filling by the utilization of the chemicals. The three studied polymers, in solely or combination mechanism, improved mainly bagasse pulp and paper properties compared to the blank sample, except for pulp drainage, which decreased by CNFs to lower volumes presumably due to its intrinsic characteristics. Cationic polymers (CP) compared to CP/CNFs approaches increased pulp retention and drainage but decreased paper density and strengths. The best pulp retention and drainage achieved by CS followed by CPAM, while paper air persistency, density, and strength properties evaluated highest by CP/CNFs followed by CNFs. Generally, CS revealed a more significant improvement in pulp and paper properties than CPAM either with or without CNFs.
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Affiliation(s)
- Milad Tajik
- Department of Biorefinery, Faculty of New Technologies Engineering, Shahid Beheshti University, Tehran, Iran
| | - Hossein Jalali Torshizi
- Department of Biorefinery, Faculty of New Technologies Engineering, Shahid Beheshti University, Tehran, Iran.
| | - Hossein Resalati
- Department of Wood and Paper Science & Technology, Faculty of Natural Resources, Sari University of Agricultural Sciences and Natural Resources, Sari, Iran
| | - Yahya Hamzeh
- Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran
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39
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de Clifford LT, Lowe JN, McKellar CD, McGowan C, David F. A Double-Blinded Positive Control Study Comparing the Relative Efficacy of 2.5% Polyacrylamide Hydrogel (PAAG) Against Triamcinolone Acetonide (TA) And Sodium Hyaluronate (HA) in the Management of Middle Carpal Joint Lameness in Racing Thoroughbreds. J Equine Vet Sci 2021; 107:103780. [PMID: 34802625 DOI: 10.1016/j.jevs.2021.103780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 09/17/2021] [Accepted: 09/20/2021] [Indexed: 12/01/2022]
Abstract
The purpose of this prospective double-blinded positive control study was to compare the efficacy of 2.5% polyacrylamide hydrogel (2.5% PAAG) in the management of middle carpal joint lameness in Thoroughbreds against treatments of triamcinolone acetonide (TA) or sodium hyaluronate (HA). A total of 31 flat-racing Thoroughbreds with lameness (grade 1-3/5) localized to the carpus by intra-articular analgesia were selected. Following a radiological assessment of the carpi confirming the absence of fragment/fracture, the horses were randomly assigned for intra-articular treatment with either 2 ml of 2.5% PAAG, 12 mg TA or 20 mg HA (followed by two further intravenous treatments of 40 mg, at weekly intervals in the HA group only), by a treating veterinarian. All horses were rested for 48 hours post-treatment and then re-entered an unaltered training regimen. Subsequent examinations at 2, 4, and 6 weeks were performed by a blinded examining veterinarian for all groups, while horses treated with 2.5% PAAG were monitored for 12 weeks for recurrence of lameness. Significantly more joints treated with 2.5% PAAG were lame free (83%) at 6 weeks compared to TA (27%; P = .007) and to HA (40%; P = .04). There was no significant difference between TA and HA groups at any time. All the joints treated within 2.5% PAAG that were lame free at 6 weeks (10/12) were still lame-free at 12 weeks. In conclusion, treatment with 2.5% PAAG led to statistically superior results compared to TA and HA in the management of selected middle carpal joint lameness in flat-racing Thoroughbreds, with therapeutic effects persisting up to 12 weeks.
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Affiliation(s)
| | | | | | - Catherine McGowan
- Equine Clinical Science, University of Liverpool, Leahurst, United Kingdom
| | - Florent David
- Equine Veterinary Medical Center, Member of Qatar Foundation, Al Rayyan, Doha, Qatar; College of Health & Life Science, Hamad Bin Khalifa University, Member of Qatar Foundation, Education city, Doha, Qatar.
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40
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Kashiyama K, Lee J, Koga K, Matsuo Y, Tanaka K. Improvement of palmoplantar pustulosis after excision of polyacrylamide injected into the nasal region. Case Reports Plast Surg Hand Surg 2021; 8:186-190. [PMID: 34790838 PMCID: PMC8592594 DOI: 10.1080/23320885.2021.2002155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
We report a patient in whom polyacrylamide hydrogel injected into the nasal region caused palmoplantar pustulosis. We report this case because few cases of autoimmune syndrome induced by adjuvants caused by polyacrylamide have been reported.
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Affiliation(s)
- Kazuya Kashiyama
- Department of Plastic and Reconstructive Surgery, Nagasaki University Hospital, Nagasaki, Japan
| | - Jinyoung Lee
- Department of Plastic and Reconstructive Surgery, Nagasaki University Hospital, Nagasaki, Japan
| | - Kazufumi Koga
- Department of Plastic and Reconstructive Surgery, Nagasaki University Hospital, Nagasaki, Japan
| | - Yumi Matsuo
- Department of Plastic and Reconstructive Surgery, Nagasaki University Hospital, Nagasaki, Japan
| | - Katsumi Tanaka
- Department of Plastic and Reconstructive Surgery, Nagasaki University Hospital, Nagasaki, Japan
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41
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Rogers AN, Mastronardo MK, Mekonnen TG, Soto AM. RNA electroelution: Comparing two electroeluter models. Anal Biochem 2021; 632:114391. [PMID: 34562467 DOI: 10.1016/j.ab.2021.114391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Revised: 08/25/2021] [Accepted: 09/20/2021] [Indexed: 10/20/2022]
Abstract
RNA represents a vibrant area of research and many studies use techniques that require large amounts of purified RNA. One common purification method involves slicing a section of a polyacrylamide gel containing the RNA of interest and eluting the RNA out of the gel using electroelution. Various electroeluter models are available but sometimes a given model becomes discontinued, compelling researchers to choose a different model. Here, we have compared two electroeluters with different chamber designs for their ability to recover RNA from gel pieces. Our results show that both electroeluters are effective and recover comparable amounts of purified RNA.
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Affiliation(s)
- Amber N Rogers
- Molecular Biology, Biochemistry & Bioinformatics Program, Towson University, Towson, MD, 21252, USA
| | - Maya K Mastronardo
- Molecular Biology, Biochemistry & Bioinformatics Program, Towson University, Towson, MD, 21252, USA
| | - Tsion G Mekonnen
- Department of Biological Sciences, Towson University, Towson, MD, 21252, USA
| | - Ana Maria Soto
- Molecular Biology, Biochemistry & Bioinformatics Program, Towson University, Towson, MD, 21252, USA; Department of Chemistry, Towson University, Towson, MD, 21252, USA.
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42
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Pogoda K, Charrier EE, Janmey PA. A Novel Method to Make Polyacrylamide Gels with Mechanical Properties Resembling those of Biological Tissues. Bio Protoc 2021; 11:e4131. [PMID: 34541049 DOI: 10.21769/bioprotoc.4131] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 04/05/2021] [Accepted: 05/09/2021] [Indexed: 11/02/2022] Open
Abstract
Studies characterizing how cells respond to the mechanical properties of their environment have been enabled by the use of soft elastomers and hydrogels as substrates for cell culture. A limitation of most such substrates is that, although their elastic properties can be accurately controlled, their viscous properties cannot, and cells respond to both elasticity and viscosity in the extracellular material to which they bind. Some approaches to endow soft substrates with viscosity as well as elasticity are based on coupling static and dynamic crosslinks in series within polymer networks or forming gels with a combination of sparse chemical crosslinks and steric entanglements. These materials form viscoelastic fluids that have revealed significant effects of viscous dissipation on cell function; however, they do not completely capture the mechanical features of soft solid tissues. In this report, we describe a method to make viscoelastic solids that more closely mimic some soft tissues using a combination of crosslinked networks and entrapped linear polymers. Both the elastic and viscous moduli of these substrates can be altered separately, and methods to attach cells to either the elastic or the viscous part of the network are described. Graphic abstract: Polyacrylamide gels with independently controlled elasticity and viscosity.
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Affiliation(s)
- Katarzyna Pogoda
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342, Krakow, Poland
| | - Elisabeth E Charrier
- Department of Physiology, Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, PA, USA
| | - Paul A Janmey
- Department of Physiology, Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, PA, USA
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43
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Sun Y, Zhang S, Jin B, Cheng S. Efficient degradation of polyacrylamide using a 3-dimensional ultra-thin SnO 2-Sb coated electrode. J Hazard Mater 2021; 416:125907. [PMID: 34492842 DOI: 10.1016/j.jhazmat.2021.125907] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 04/13/2021] [Accepted: 04/13/2021] [Indexed: 06/13/2023]
Abstract
Polyacrylamide (PAM) is widely used in polymer flooding processes to increase oil recovery while the byproduct of PAM-containing wastewater is a serious environmental issue. In this study, electrochemical oxidation process (EAOP) was applied for treating PAM wastewater using a new type of 3-dimensional ultra-thin SnO2-Sb electrode. Nano-sized catalysts were evenly dispersed both on the surface and inside of a porous Ti filter forming nano-thickness catalytic layer that enhances the utilization and bonding of catalysts. This porous Ti electrode showed 20% improved OH· production and 16.3 times increased accelerated service life than the planar Ti electrode. Using this electrode to treat 100 mg L-1 PAM, the TOC removal efficiency reached over 99% within 3 h under current density of 20 mA cm-2. The EAOP could fastly break the long-chain PAM molecules into small molecular intermediates. With the porous electrode treating 5 g L-1 PAM under current density of 30 mA cm-2, EAOP reduced 94.2% of average molecular weight in 1 h and 92.0% of solution viscosity in 0.5 h. Moreover, the biodegradability of PAM solution was significantly improved as the solution BOD5/COD ratio raised from 0.05 to 0.41 after 4 h treatment. The degradation pathway of PAM was also investigated.
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Affiliation(s)
- Yi Sun
- State Key Laboratory of Clean Energy, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China; PowerChina Huadong Engineering Co. Ltd., Hangzhou 310014, PR China
| | - Shudi Zhang
- School of Life Sciences, Anhui University, Anhui 230601, PR China
| | - Beichen Jin
- State Key Laboratory of Clean Energy, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China
| | - Shaoan Cheng
- State Key Laboratory of Clean Energy, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China.
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Katzman D, Bohbot-Raviv Y, Dubowski Y. Does polyacrylamide-based adjuvant actually reduce primary drift of airborne pesticides? Sci Total Environ 2021; 775:145816. [PMID: 33631585 DOI: 10.1016/j.scitotenv.2021.145816] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 02/08/2021] [Accepted: 02/08/2021] [Indexed: 06/12/2023]
Abstract
Atmospheric drift of pesticides sprayed outside treated fields may pose serious environmental and health concerns. Chemical adjuvants, among other techniques, reduce drift by modifying the physicochemical properties of the pesticide solution, which presumably produces larger droplets upon spraying that are less prone to drift. Previous studies, that have addressed the effect of adjuvants on drift reduction, mainly rely on measurements of droplet sedimentation while ignoring the presence of pesticides in the forms of small aerosols and vapor. Such forms are expected to be highly susceptible to atmospheric drift that may pose human health risk via inhalation exposure. The present study examines the effect of a polymer-based adjuvant on airborne-pesticide drift using active air sampling in two field campaigns. Surprisingly, these measurements indicate higher primary drift (PD) of airborne pesticides in the presence of adjuvant in the spraying solution. The results are further supported by comparing measured drifts to those calculated using a modified Gaussian puff dispersion model, which enabled to evaluate the impact of varying meteorological conditions during the field experiments. In addition, the adjuvant effect on droplet size distribution generated by common nozzles, was tested in a wind tunnel. The resulting size-distributions demonstrated that while the addition of adjuvant resulted in a desired shift of the volumetric distribution towards larger droplets, it also led to a significant increase in the number concentration of fine droplets. Such trends can explain how the addition of polymeric adjuvant can yield both, a reduction in sedimenting drift outside treated areas and an increase in airborne PD intensity, as observed in the present study. This study demonstrates the complex effect of chemical adjuvants and the urgent need to further explore and understand their environmental impact.
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Affiliation(s)
- Doron Katzman
- Faculty of Civil and Environmental Engineering, Israel Institute of Technology (Technion), Haifa, Israel
| | - Yardena Bohbot-Raviv
- Division of Environmental Science, Israel Institute of Biological Research, Ness Ziona, Israel
| | - Yael Dubowski
- Faculty of Civil and Environmental Engineering, Israel Institute of Technology (Technion), Haifa, Israel.
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Myhr SS, Rakovan M, Schiøtz HA. Periurethral injection with polyacrylamide after previous TVT surgery. Int Urogynecol J 2021; 33:1017-1022. [PMID: 34106322 DOI: 10.1007/s00192-021-04891-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 05/26/2021] [Indexed: 11/26/2022]
Abstract
INTRODUCTION AND HYPOTHESIS The aim of this registry study was to assess the clinical utility of using periurethral bulking with polyacrylamide hydrogel in women with stress urinary incontinence (SUI) after previous midurethral sling surgery. METHODS The study period was 2007 through 2019. Using data from the Norwegian Female Incontinence Registry we included 57 women who had received Bulkamid® because of insufficient improvement or recurrent SUI after previous retropubic TVT surgery. The primary outcome was cure of SUI, and secondary outcomes were patient satisfaction, degree of leakage, change in urgency incontinence (UUI), free flow rate, postvoid residual volume, and complications. Descriptive statistics were used to characterize data and Wilcoxon signed-rank test to compare pre- and postoperative results for pairs, with level of significance at p < 0.05. RESULTS Pure SUI was seen in 19 (33.3%) while 38 (66.7%) had mixed incontinence. Postoperatively 72.9% had a negative stress test and 73.7% were satisfied with treatment. There was only 1 complication in 67 injections (1.5%). De novo UUI occurred in five patients, corresponding to 8.8% of the whole study group, but 26.3% among those with no preoperative UUI problems. Among the patients with preoperative UUI, 39.5% were cured of this problem and a further 36.8% were improved. CONCLUSIONS The cure rate and satisfaction rate of periurethral bulking with polyacrylamide after previous MUS are favorable and complications are rare. There seems to be a risk of overactive bladder symptoms developing in women with no such symptoms preoperatively.
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Affiliation(s)
- Siv Svennevik Myhr
- Department of Obstetrics and Gynecology, Vestfold Hospital Trust, PO Box 2168, Postterminalen, 3103, Tønsberg, Norway
| | - Martin Rakovan
- Department of Obstetrics and Gynecology, Vestfold Hospital Trust, PO Box 2168, Postterminalen, 3103, Tønsberg, Norway
| | - Hjalmar A Schiøtz
- Department of Obstetrics and Gynecology, Vestfold Hospital Trust, PO Box 2168, Postterminalen, 3103, Tønsberg, Norway.
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Hariri A, Palma-Chavez J, Wear KA, Pfefer TJ, Jokerst JV, Vogt WC. Polyacrylamide hydrogel phantoms for performance evaluation of multispectral photoacoustic imaging systems. Photoacoustics 2021; 22:100245. [PMID: 33747787 PMCID: PMC7972966 DOI: 10.1016/j.pacs.2021.100245] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 12/09/2020] [Accepted: 02/12/2021] [Indexed: 05/21/2023]
Abstract
As photoacoustic imaging (PAI) begins to mature and undergo clinical translation, there is a need for well-validated, standardized performance test methods to support device development, quality control, and regulatory evaluation. Despite recent progress, current PAI phantoms may not adequately replicate tissue light and sound transport over the full range of optical wavelengths and acoustic frequencies employed by reported PAI devices. Here we introduce polyacrylamide (PAA) hydrogel as a candidate material for fabricating stable phantoms with well-characterized optical and acoustic properties that are biologically relevant over a broad range of system design parameters. We evaluated suitability of PAA phantoms for conducting image quality assessment of three PAI systems with substantially different operating parameters including two commercial systems and a custom system. Imaging results indicated that appropriately tuned PAA phantoms are useful tools for assessing and comparing PAI system image quality. These phantoms may also facilitate future standardization of performance test methodology.
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Affiliation(s)
- Ali Hariri
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Jorge Palma-Chavez
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Keith A Wear
- Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA
| | - T Joshua Pfefer
- Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA
| | - Jesse V Jokerst
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
- Department of Radiology, University of California San Diego, La Jolla, CA 92093, USA
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA 92093, USA
| | - William C Vogt
- Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA
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Chalcarz M, Żurawski J. Injection of Aquafilling ® for Breast Augmentation Causes Inflammatory Responses Independent of Visible Symptoms. Aesthetic Plast Surg 2021; 45:481-490. [PMID: 32939601 PMCID: PMC8012309 DOI: 10.1007/s00266-020-01949-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 08/16/2020] [Indexed: 01/11/2023]
Abstract
Background A major concern related to modern surgery is to evaluate and address the complications associated with breast enlargement using Aquafilling® injection. This study aimed to assess the effect of Aquafilling® injection on immune response in such patients. Methods For four patients who consulted a surgeon after receiving Aquafilling® injection, medical history of the patients was taken; based on imaging examinations, Aquafilling® was removed. Samples were processed for histopathological and immunohistochemical examination. For detecting tissue antigens in histopathological samples, monoclonal antibodies against CD3 (lymphocytes T), CD 20 (lymphocytes B), and CD68 (macrophages) were used. By analyzing the images, the number of immune cells (lymphocytes T, lymphocytes B, and macrophages) and immunohistochemical reaction area were semiquantitatively evaluated. Results Different clinical features were observed in each patient after receiving Aquafilling® injection. In samples obtained from four patients, lymphocytes T (CD3), lymphocytes B (CD20), and macrophages (CD68) tissue expressions were observed. Statistically significant variations in the number of lymphocytes B (CD20) and macrophages (CD68), and differentiation of immunohistochemical reaction area for lymphocytes T (CD3) and lymphocytes B (CD20) were observed. Conclusions Inflammation is elevated in patients who received Aquafilling® injection. Medical imaging should be carried out in all such patients even if there are no visible symptoms. Removal of Aquafilling® can reduce the inflammation and risk of neoplastic progression in the patients. The influence of time elapsed since Aquafilling® injection and intensity of immune response requires further validation. Level of Evidence IV This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266.
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Affiliation(s)
- Michał Chalcarz
- Chalcarz Clinic, Aesthetic Surgery, Aesthetic Medicine, Poznań, Poland
- Bieńkowski Medical Center - Plastic Surgery, Bydgoszcz, Poland
| | - Jakub Żurawski
- Department of Immunobiology, Poznan University of Medical Sciences, Poznań, Poland
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Ma L, Hu T, Liu Y, Liu J, Wang Y, Wang P, Zhou J, Chen M, Yang B, Li L. Combination of biochar and immobilized bacteria accelerates polyacrylamide biodegradation in soil by both bio-augmentation and bio-stimulation strategies. J Hazard Mater 2021; 405:124086. [PMID: 33153796 DOI: 10.1016/j.jhazmat.2020.124086] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 09/21/2020] [Accepted: 09/22/2020] [Indexed: 05/22/2023]
Abstract
Polyacrylamide (PAM) has been used extensively due to its well-known stable chemical properties, but limited information is available on the biodegradation of soil-containing PAM. In this work, sufficient degradation of PAM was achieved via the addition of the Klebsiella sp. PCX-biochar composite to PAM-containing soil, due to the synergic effect of bio-augmentation and bio-stimulation. The optimal degradation rate of 69.1% over 30-day period was observed under the following conditions: the addition of immobilized bacteria at 0.07 g/g, pH 6.6, and temperature at 38.0 °C. In this study, we showed that PAM was successfully hydrolyzed by amidase, and ammonia in the hydrolysis product was then oxidized by the nitrifying bacteria. The decrease of water-extractable organic carbon (WEOC) also demonstrated the chain cleavage in PAM. PAM was utilized as a carbon source not only by Klebsiella sp. PCX but also by some taxa from indigenous bacteria. Last but not least, it was shown in this study that biochar, even though immobilized with exogenous microorganisms, actually enhanced bacterial diversity and stimulated the growth of some indigenous PAM-degrading taxa. Based on the above observations, we concluded that PAM biodegradation via the addition of bacteria-immobilized biochar was a synergy of both bio-augmentation and bio-stimulation strategies.
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Affiliation(s)
- Lili Ma
- Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China; Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China; National Postdoctoral Research Station, Haitian Water Group Co., Ltd, Chengdu 610041, China.
| | - Ting Hu
- Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Yucheng Liu
- Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Jie Liu
- Center for Grassland Microbiome, Lanzhou University, Lanzhou 730000, China
| | - Yingying Wang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Puzhou Wang
- Synthego Corporation, Redwood City, CA 94063, United States
| | - Jiyue Zhou
- Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Mingyan Chen
- Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Bing Yang
- Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Lingli Li
- Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
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Ai J, Wang Z, Dionysiou DD, Liu M, Deng Y, Tang M, Liao G, Hu A, Zhang W. Understanding synergistic mechanisms of ferrous iron activated sulfite oxidation and organic polymer flocculation for enhancing wastewater sludge dewaterability. Water Res 2021; 189:116652. [PMID: 33278721 DOI: 10.1016/j.watres.2020.116652] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 11/01/2020] [Accepted: 11/16/2020] [Indexed: 06/12/2023]
Abstract
The bound water in waste activated sludge (WAS) is trapped in extracellular polymeric substances (EPS) in the form of gel-like structure, leading to a great challenge in the sludge deep dewatering. Traditional flocculation conditioning is unable to destroy EPS and ineffective to remove the bound water in WAS. In this study, we employed integration of Fe(II)-sulfite oxidation and polyacrylamide flocculation (F/S-PAM) treatment for removing the bound water and improving sludge dewaterability under aerobic conditions. Meanwhile, the floc microstructure and EPS properties were examined to understand the mechanisms of F/S-PAM conditioning. F/S produced SO3·- radicals which could decompose the EPS in sludge, releasing bound water into free water. In addition, the formed Fe(III) from F/S led to re-coagulation of decomposed EPS, and C=O groups of tryptophan played the leading role in Fe-EPS association binding, causing transformation of the secondary structure of proteins (especially β-sheets and α-helices). Then, the introduction of PAM caused re-flocculation of disintegrated sludge flocs, enhancing the sludge filterability. This work provides a novel and cost-effective method for efficient removal of bound water in sludge, and subsequence improvement in sludge dewaterability.
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Affiliation(s)
- Jing Ai
- Faculty Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, Hubei, China; Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering (ChEE), University of Cincinnati, Cincinnati, OH 45221-0012, USA
| | - Zhiyue Wang
- The Biotechnology Institute, University of Minnesota, St. Paul, MN 55108-6106, USA
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering (ChEE), University of Cincinnati, Cincinnati, OH 45221-0012, USA.
| | - Ming Liu
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China
| | - Yun Deng
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China
| | - Mingyue Tang
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China
| | - Guiying Liao
- Faculty Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, Hubei, China
| | - Aibin Hu
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China
| | - Weijun Zhang
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China.
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50
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Labeeuw L, Commault AS, Kuzhiumparambil U, Emmerton B, Nguyen LN, Nghiem LD, Ralph PJ. A comprehensive analysis of an effective flocculation method for high quality microalgal biomass harvesting. Sci Total Environ 2021; 752:141708. [PMID: 32892040 DOI: 10.1016/j.scitotenv.2020.141708] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 08/12/2020] [Accepted: 08/13/2020] [Indexed: 06/11/2023]
Abstract
Flocculation is a low-cost harvesting technique for microalgae biomass production, but flocculation efficiency is species dependent. In this study, we investigated the efficacy of two synthetic (polyacrylamide) and one natural (chitosan) flocculants against three algal species: the cyanobacterium Synechocystis sp., the freshwater Chlorella vulgaris, and the marine Phaeodactylum tricornutum at laboratory and pilot scales to evaluate harvesting efficiency, biomass integrity and media recycling. Growth phase affected the harvesting efficiency of the eukaryotic microalgae. The flocculation was optimal at stationary phase with high flocculation efficiency achieved using polyacrylamides at 24-36 mg/g dry weight. The effect of the flocculants on the harvested biomass was investigated. The flocculated Synechocystis sp. showed a higher proportion of compromised cells compared to C. vulgaris and P. tricornutum likely due to differences in cell walls composition. Compromised cells could lead to the release of valuable products into the surrounding growth media during flocculation. The residual culture media was recycled once with no impact on cell growth for all treatments and algal species. The flocculation technique was demonstrated at pilot-scale using 350 L microalgal suspension, showing an efficiency of 82-90% at a polyacrylamide dosage of 6.5-10 mg/L. This efficiency and the biomass quality are comparable to the laboratory-scale results. Overall, results indicate that polyacrylamide flocculants work on a wide range of species without the need for pre-treatment. The information generated in this study can contribute to making the microalgae industry more competitive.
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Affiliation(s)
- Leen Labeeuw
- University of Technology Sydney, Climate Change Cluster, Faculty of Science, Sydney, NSW 2007, Australia.
| | - Audrey S Commault
- University of Technology Sydney, Climate Change Cluster, Faculty of Science, Sydney, NSW 2007, Australia
| | | | - Benjamin Emmerton
- University of Technology Sydney, Climate Change Cluster, Faculty of Science, Sydney, NSW 2007, Australia
| | - Luong N Nguyen
- University of Technology Sydney, Centre for Technology in Water and Wastewater, Sydney, NSW 2007, Australia
| | - Long D Nghiem
- University of Technology Sydney, Centre for Technology in Water and Wastewater, Sydney, NSW 2007, Australia; Nguyen Tat Thanh University, NTT Institute of Hi-Technology, Ho Chi Minh City, Viet Nam
| | - Peter J Ralph
- University of Technology Sydney, Climate Change Cluster, Faculty of Science, Sydney, NSW 2007, Australia
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