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Lee D, Noh J, Moon SY, Shin TJ, Choi YK, Park J. Pectin Nanoporous Structures Prepared via Salt-Induced Phase Separation and Ambient Azeotropic Evaporation Processes. Biomacromolecules 2024; 25:1709-1723. [PMID: 38377481 DOI: 10.1021/acs.biomac.3c01230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Polysaccharide nanoporous structures are suitable for various applications, ranging from biomedical scaffolds to adsorption materials, owing to their biocompatibility and large surface areas. Pectin, in particular, can create 3D nanoporous structures in aqueous solutions by binding with calcium cations and creating nanopores by phase separation; this process involves forming hydrogen bonds between alcohols and pectin chains in water and alcohol mixtures and the resulting penetration of alcohols into calcium-bound pectin gels. However, owing to the dehydration and condensation of polysaccharide chains during drying, it has proven to be challenging to maintain the 3D nanoporous structure without using a freeze-drying process or supercritical fluid. Herein, we report a facile method for creating polysaccharide-based xerogels, involving the co-evaporation of water with a nonsolvent (e.g., a low-molecular-weight hydrophobic alcohol such as isopropyl or n-propyl alcohol) at ambient conditions. Experiments and coarse-grained molecular dynamics simulations confirmed that salt-induced phase separation and hydrogen bonding between hydrophobic alcohols and pectin chains were the dominant processes in mixtures of pectin, water, and hydrophobic alcohols. Furthermore, the azeotropic evaporation of water and alcohol mixed in approximately 1:1 molar ratios was maintained during the natural drying process under ambient conditions, preventing the hydration and aggregation of the hydrophilic pectin chains. These results introduce a simple and convenient process to produce 3D polysaccharide xerogels under ambient conditions.
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Affiliation(s)
- Dabin Lee
- Department of Chemical Engineering, Department of Intelligent Energy and Industry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Juran Noh
- Department of Material Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Su-Young Moon
- Gas & Carbon Convergent Research Center, Chemical & Process Technology, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea
| | - Tae Joo Shin
- UNIST Central Research Facilities & School of Natural Science, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Yeol Kyo Choi
- Departments of Biological Sciences and Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Juhyun Park
- Department of Chemical Engineering, Department of Intelligent Energy and Industry, Chung-Ang University, Seoul 06974, Republic of Korea
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2
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Guan F, Feng S, Sun J, Yang Q, Zhang Y, Li Z, Tao J, Ji X, Wang Y, Bao D, Guo J, Zhang S. Low-temperature superelastic, anisotropic, silane-crosslinked sodium alginate aerogel for thermal insulation. Int J Biol Macromol 2024; 262:129800. [PMID: 38296125 DOI: 10.1016/j.ijbiomac.2024.129800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/23/2024] [Accepted: 01/25/2024] [Indexed: 02/13/2024]
Abstract
Bio-aerogels have attracted much attention owing to their remarkable properties, but their brittle and poor elasticity has limited their further applications. Here, we propose a strategy of in-situ silanization crosslinking combined with unidirectional freeze casting (SUFC) to prepare superelastic sodium alginate (SA) aerogels. The resulting aerogel was ultra-light (0.048 g/cm3), high porosity (96.86 %), and self-extinguishing from fire. Aerogels exhibited anisotropic properties, such as low-temperature elasticity (500 g compression at -70 °C 10-cycle, 99.6 % recovery), exceptional fatigue resistance (100-cycle at 50 % strain), and excellent thermal insulation (0.0696 W·m-1·K-1). Thus, the SUFC strategy provides considerable freedom for constructing multi-material, lamellar/honeycomb structured alginate-based aerogels, which pave the way to thermal insulation development at low temperatures.
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Affiliation(s)
- Fucheng Guan
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China; Key Laboratory of Textile Fiber and Products (Wuhan Textile University), Ministry of Education, Wuhan 430200, China
| | - Shi Feng
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Jianbin Sun
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Qiang Yang
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Yihang Zhang
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Zheng Li
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Jing Tao
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Xinbin Ji
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Yonghe Wang
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Da Bao
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Jing Guo
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China.
| | - Sen Zhang
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
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Wang M, Miao X, Hou C, Xu K, Ke Z, Dai F, Liu M, Li H, Chen C. Devisable pore structures and tunable thermal management properties of aerogels composed of carbon nanotubes and cellulose nanofibers with various aspect ratios. Carbohydr Polym 2024; 323:121437. [PMID: 37940302 DOI: 10.1016/j.carbpol.2023.121437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/06/2023] [Accepted: 09/26/2023] [Indexed: 11/10/2023]
Abstract
The anisotropic cellulose nanofiber (CNF)/carbon nanotube (CNT) aerogels hold a great promise in directional applications due to their distinct xylem-like aligned penetrating pore structures. The aspect ratio of CNF plays a crucial role in the pore structures of aerogels, directly dominating the final macroscopic properties of materials. Herein, three types of CNF with different aspect ratios were extracted through the 2,2,6,6-tetrmethylpiperidine-1-oxyl radical (TEMPO) oxidation process by changing the doses of oxidant. The corresponding anisotropic CNF/CNT aerogels were prepared by the unidirectional freeze-drying method and then their pore morphologies and properties were investigated in detail. The resulting aerogel with the shortest aspect ratio of CNF exhibited the densest porous structure, thereby obtaining the highest compressive strength of 110 kPa and elastic modulus of 383 kPa, while that containing the longest CNF possessed the highest thermal conductivity coefficient of 0.17 W m-1 K-1 and the worst thermal insulation. This research explored the relationship between the properties of the CNF/CNT aerogels and devisable pore structures caused by various aspect ratios of CNF, thus providing a new insight into the development of CNF/CNT aerogels with tunable performances.
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Affiliation(s)
- Mengxia Wang
- Center for Advanced Low-Dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China
| | - Xiaran Miao
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China.
| | - Chen Hou
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
| | - Ke Xu
- Center for Advanced Low-Dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China
| | - Zhao Ke
- Center for Advanced Low-Dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China
| | - Fengna Dai
- Center for Advanced Low-Dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China
| | - Mingyuan Liu
- Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China
| | - Hui Li
- Center for Advanced Low-Dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China
| | - Chunhai Chen
- Center for Advanced Low-Dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China.
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Pantić M, Maver U, Rožanc J, Vihar B, Andrejč DC, Knez Ž, Novak Z. Evaluation of ethanol-induced chitosan aerogels with human osteoblast cells. Int J Biol Macromol 2023; 253:126694. [PMID: 37673150 DOI: 10.1016/j.ijbiomac.2023.126694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 08/31/2023] [Accepted: 09/02/2023] [Indexed: 09/08/2023]
Abstract
The following article provides an insight into the production of chitosan aerogels as potential materials for tissue engineering. Chitosan aerogels were prepared following two different protocols: formation in ethanol and formation in sodium hydroxide in an ethanol solution. The main objective was to apply a new route to obtain chitosan aerogels with no external cross-linkers and compare the mentioned preparation approaches. Forming chitosan aerogels in ethanol implies a simple, environmentally friendly, and efficient method. The prepared materials showed specific surface areas of up to 450 m2/g, highly porous networks and great mechanical properties. In vitro degradation studies revealed high stability for up to 10 weeks. The differences between the samples were significant. While the chitosan aerogels prepared in ethanol showed superior textural, morphological and mechanical properties, the chitosan aerogels prepared in the sodium hydroxide solution proved that a considerable influence on end properties could be made simply by adjusting the ageing medium. In vitro cell analysis with primary human osteoblasts showed good biocompatibility and pointed towards the potential use of these aerogels for orthopedic applications. This testing showed further that adjustments in structural properties by sodium hydroxide also come with a cost regarding their suitability to host bone cells.
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Affiliation(s)
- Milica Pantić
- University of Maribor, Faculty of Chemistry and Chemical Engineering, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Uroš Maver
- University of Maribor, Faculty of Medicine, Taborska ulica 8, 2000 Maribor, Slovenia
| | - Jan Rožanc
- University of Maribor, Faculty of Medicine, Taborska ulica 8, 2000 Maribor, Slovenia
| | - Boštjan Vihar
- University of Maribor, Faculty of Medicine, Taborska ulica 8, 2000 Maribor, Slovenia
| | - Darija Cör Andrejč
- University of Maribor, Faculty of Chemistry and Chemical Engineering, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Željko Knez
- University of Maribor, Faculty of Chemistry and Chemical Engineering, Smetanova ulica 17, 2000 Maribor, Slovenia; University of Maribor, Faculty of Medicine, Taborska ulica 8, 2000 Maribor, Slovenia
| | - Zoran Novak
- University of Maribor, Faculty of Chemistry and Chemical Engineering, Smetanova ulica 17, 2000 Maribor, Slovenia.
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Vrabič-Brodnjak U. Hybrid Materials of Bio-Based Aerogels for Sustainable Packaging Solutions. Gels 2023; 10:27. [PMID: 38247750 PMCID: PMC10815338 DOI: 10.3390/gels10010027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 12/20/2023] [Accepted: 12/21/2023] [Indexed: 01/23/2024] Open
Abstract
This review explores the field of hybrid materials in the context of bio-based aerogels for the development of sustainable packaging solutions. Increasing global concern over environmental degradation and the growing demand for environmentally friendly alternatives to conventional packaging materials have led to a growing interest in the synthesis and application of bio-based aerogels. These aerogels, which are derived from renewable resources such as biopolymers and biomass, have unique properties such as a lightweight structure, excellent thermal insulation, and biodegradability. The manuscript addresses the innovative integration of bio-based aerogels with various other materials such as nanoparticles, polymers, and additives to improve their mechanical, barrier, and functional properties for packaging applications. It critically analyzes recent advances in hybridization strategies and highlights their impact on the overall performance and sustainability of packaging materials. In addition, the article identifies the key challenges and future prospects associated with the development and commercialization of hybrid bio-based aerogel packaging materials. The synthesis of this knowledge is intended to contribute to ongoing efforts to create environmentally friendly alternatives that address the current problems associated with conventional packaging while promoting a deeper understanding of the potential of hybrid materials for sustainable packaging solutions.
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Affiliation(s)
- Urška Vrabič-Brodnjak
- Department of Textiles, Graphic Arts and Design, Faculty of Natural Sciences and Engineering, University of Ljubljana, Snežniška 5, 1000 Ljubljana, Slovenia
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Basak S, Singhal RS. The potential of supercritical drying as a “green” method for the production of food-grade bioaerogels: A comprehensive critical review. Food Hydrocoll 2023. [DOI: 10.1016/j.foodhyd.2023.108738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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7
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Hybrid Polylactic-Acid-Pectin Aerogels: Synthesis, Structural Properties, and Drug Release. Polymers (Basel) 2023; 15:polym15020407. [PMID: 36679286 PMCID: PMC9862002 DOI: 10.3390/polym15020407] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/05/2023] [Accepted: 01/10/2023] [Indexed: 01/14/2023] Open
Abstract
Wound-dressing materials often include other materials stimulating wound healing. This research describes the first formulation of biodegradable hybrid aerogels composed of polylactic acid and pectin. The prepared hybrid material showed a highly porous structure with a surface area of 166 ± 22.6 m2·g-1. The addition of polylactic acid may have decreased the surface area of the pure pectin aerogel, but it improved the stability of the material in simulated body fluid (SBF). The pure pectin aerogel showed a high swelling and degradation ratio after 3 h. The addition of the polylactic acid prolonged its stability in the simulated body fluid from 24 h to more than one week, depending on the amount of polylactic acid. Biodegradable aerogels were loaded with indomethacin and diclofenac sodium as model drugs. The entrapment efficiencies were 63.4% and 62.6% for indomethacin and diclofenac sodium, respectively. Dissolution of both drugs was prolonged up to 2 days. Finally, sodium percarbonate and calcium peroxide were incorporated into the bioaerogels as chemical oxygen sources, to evaluate oxygen generation for potential wound healing applications.
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Impact of Crosslinking on the Characteristics of Pectin Monolith Cryogels. Polymers (Basel) 2022; 14:polym14235252. [PMID: 36501645 PMCID: PMC9737063 DOI: 10.3390/polym14235252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 11/24/2022] [Accepted: 11/28/2022] [Indexed: 12/05/2022] Open
Abstract
In this research, the pectin monoliths were prepared via the sol-gel process through different routes of crosslinking and additional freeze-drying. The crosslinking reaction was induced by the use of calcium ions in aqueous solutions and in alcohol/water solutions. The resulting pectin monoliths obtained by freeze-drying were macroporous with open cells, limited specific surface area, moderate mechanical stability and moderate biodegradation rate. The presence of alcohol in crosslinking solution significantly changed the morphology of final pectin monoliths, which was evidenced by the reduction of their pore size for one order. The specific surface area of pectin monoliths obtained through the calcium-water-alcohol route was 25.7 m2/g, the Young compressive modulus was 0.52 MPa, and the biodegradation rate was 45% after 30 days of immersion in compost media. Considering that pectin can be obtained from food waste, and its physical properties could be tailored by different crosslinking routes, the pectin monoliths could find wide application in the pharmaceutical, agricultural, medical and food industries, providing sustainable development concepts.
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Selvasekaran P, Chidambaram R. Bioaerogels as food materials: A state-of-the-art on production and application in micronutrient fortification and active packaging of foods. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.107760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Song Q, Wu L, Li S, Zhao G, Cheng Y, Zhou Y. Aggregation of konjac glucomannan by ethanol under low-alkali treatment. Food Chem X 2022; 15:100407. [PMID: 36211790 PMCID: PMC9532775 DOI: 10.1016/j.fochx.2022.100407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 07/24/2022] [Accepted: 08/01/2022] [Indexed: 11/30/2022] Open
Abstract
Microstructure of KGM alcogels is distinct from that of normal KGM gels. Gel network of EAKgel is more heterogeneous than that of EKgel. Ethanol arranges the aggregation of deacetylated KGM chains. Both structure and function of KGM aggregates are altered by ethanol and alkali. Solvent quality deterioration drives the formation of low-alkali KGM alcogels.
Utilizing ethanol in konjac glucomannan (KGM) gelation has important food processing applications. Typically, ethanol positively impacts the formation of low-alkali KGM gels and dramatically changes their physical properties, but the role of ethanol on the aggregation of KGM chains and the resultant gelation is less well understood. This study presents the distinct microstructures of low-alkali KGM gels incorporating ethanol. The fibril diameter and mesh size were determined to be 262.3 ± 22.3 nm and 2.680 ± 0.035 μm in average, contributing to a higher degree of anisotropy of such a gel network. Ethanol favors intermolecular aggregation by increasing the Rg of small-sized aggregates to 2.10 nm. The FTIR and temperature-cycled rheological studies suggest there are hydrophobic interactions stabilizing the gel network with the assistance of hydrogen bonds. The spatial confinement of deacetylated KGM chains as the solvent quality deteriorates by incorporating ethanol may arrange the aggregation and induce the structural reorganization in gel formation.
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Ferreira-Gonçalves T, Iglesias-Mejuto A, Linhares T, Coelho JMP, Vieira P, Faísca P, Catarino J, Pinto P, Ferreira D, Ferreira HA, Gaspar MM, Durães L, García-González CA, Reis CP. Biological Thermal Performance of Organic and Inorganic Aerogels as Patches for Photothermal Therapy. Gels 2022; 8:gels8080485. [PMID: 36005086 PMCID: PMC9407269 DOI: 10.3390/gels8080485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 07/24/2022] [Accepted: 07/27/2022] [Indexed: 11/30/2022] Open
Abstract
Aerogels are materials with unique properties, among which are low density and thermal conductivity. They are also known for their exquisite biocompatibility and biodegradability. All these features make them attractive for biomedical applications, such as their potential use in photothermal therapy (PTT). This technique is, yet, still associated with undesirable effects on surrounding tissues which emphasizes the need to minimize the exposure of healthy regions. One way to do so relies on the use of materials able to block the radiation and the heat generated. Aerogels might be potentially useful for this purpose by acting as insulators. Silica- and pectin-based aerogels are reported as the best inorganic and organic thermal insulators, respectively; thus, the aim of this work relies on assessing the possibility of using these materials as light and thermal insulators and delimiters for PTT. Silica- and pectin-based aerogels were prepared and fully characterized. The thermal protection efficacy of the aerogels when irradiated with a near-infrared laser was assessed using phantoms and ex vivo grafts. Lastly, safety was assessed in human volunteers. Both types presented good textural properties and safe profiles. Moreover, thermal activation unveils the better performance of silica-based aerogels, confirming the potential of this material for PTT.
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Affiliation(s)
- Tânia Ferreira-Gonçalves
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal; (T.F.-G.); (P.P.); (M.M.G.)
- Instituto de Biofísica e Engenharia Biomédica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; (J.M.P.C.); (H.A.F.)
| | - Ana Iglesias-Mejuto
- I+D Farma Group (GI-1645), Department of Pharmacology, Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, iMATUS and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain; (A.I.-M.); (C.A.G.-G.)
| | - Teresa Linhares
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, 3030-790 Coimbra, Portugal; (T.L.); (L.D.)
- 2C2T-Centre for Textile Science and Technology, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal
| | - João M. P. Coelho
- Instituto de Biofísica e Engenharia Biomédica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; (J.M.P.C.); (H.A.F.)
| | - Pedro Vieira
- Physics Department, NOVA School of Science and Technology (Campus de Caparica), 2829-516 Caparica, Portugal;
| | - Pedro Faísca
- CBIOS-Research Center for Biosciences & Health Technologies, Universidade Lusófona de Humanidades e Tecnologias, Campo Grande 376, 1749-024 Lisboa, Portugal;
| | - José Catarino
- Faculdade de Medicina Veterinária, Universidade Lusófona de Humanidades e Tecnologias, Campo Grande 376, 1749-024 Lisboa, Portugal;
| | - Pedro Pinto
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal; (T.F.-G.); (P.P.); (M.M.G.)
| | - David Ferreira
- Comprehensive Health Research Centre (CHRC), Departamento de Desporto e Saúde, Escola de Saúde e Desenvolvimento Humano, Universidade de Évora, Largo dos Colegiais, 7004-516 Évora, Portugal;
| | - Hugo A. Ferreira
- Instituto de Biofísica e Engenharia Biomédica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; (J.M.P.C.); (H.A.F.)
| | - Maria Manuela Gaspar
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal; (T.F.-G.); (P.P.); (M.M.G.)
| | - Luísa Durães
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, 3030-790 Coimbra, Portugal; (T.L.); (L.D.)
| | - Carlos A. García-González
- I+D Farma Group (GI-1645), Department of Pharmacology, Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, iMATUS and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain; (A.I.-M.); (C.A.G.-G.)
| | - Catarina Pinto Reis
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal; (T.F.-G.); (P.P.); (M.M.G.)
- Instituto de Biofísica e Engenharia Biomédica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal; (J.M.P.C.); (H.A.F.)
- Correspondence: ; Tel.: +351-217-946-429 (ext. 14244); Fax: +351-217-946-470
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12
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Horvat G, Pantić M, Knez Ž, Novak Z. A Brief Evaluation of Pore Structure Determination for Bioaerogels. Gels 2022; 8:gels8070438. [PMID: 35877523 PMCID: PMC9316429 DOI: 10.3390/gels8070438] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 07/01/2022] [Accepted: 07/11/2022] [Indexed: 01/03/2023] Open
Abstract
This review discusses the most commonly employed methods for determining pore size and pore size distribution in bioaerogels. Aerogels are materials with high porosity and large surface areas. Most of their pores are in the range of mesopores, between 2 and 50 nm. They often have smaller or larger pores, which presents a significant challenge in determining the exact mean pore size and pore size distribution in such materials. The precision and actual value of the pore size are of considerable importance since pore size and pore size distribution are among the main properties of aerogels and are often directly connected with the final application of those materials. However, many recently published papers discuss or present pore size as one of the essential achievements despite the misinterpretation or the wrong assignments of pore size determination. This review will help future research and publications evaluate the pore size of aerogels more precisely and discuss it correctly. The study covers methods such as gas adsorption, from which BJH and DFT models are often used, SEM, mercury porosimetry, and thermoporometry. The methods are described, and the results obtained are discussed. The following paper shows that there is still no precise method for determining pore size distribution or mean pore size in aerogels until now. Knowing that, it is expected that this field will evolve in the future.
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Affiliation(s)
- Gabrijela Horvat
- Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia; (G.H.); (M.P.); (Ž.K.)
| | - Milica Pantić
- Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia; (G.H.); (M.P.); (Ž.K.)
| | - Željko Knez
- Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia; (G.H.); (M.P.); (Ž.K.)
- Faculty of Medicine, University of Maribor, Taborska ulica 8, 2000 Maribor, Slovenia
| | - Zoran Novak
- Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia; (G.H.); (M.P.); (Ž.K.)
- Correspondence:
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13
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Zhang Y, Song Q, Tian Y, Zhao G, Zhou Y. Insights into biomacromolecule-based alcogels: A review on their synthesis, characteristics and applications. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.107574] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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14
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Tian Y, Song Q, Liu Z, Ye F, Zhou Y, Zhao G. Linear and non-linear rheological properties of water–ethanol hybrid pectin gels for aroma enhancement. Food Chem X 2022; 14:100328. [PMID: 35601213 PMCID: PMC9118527 DOI: 10.1016/j.fochx.2022.100328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 04/09/2022] [Accepted: 05/05/2022] [Indexed: 11/16/2022] Open
Abstract
Linear to non-linear rheological responses of WEPGs were characterized. Gel rheological properties can be tuned by changing ethanol concentration. Non-linear viscoelasticity should be considered for aroma enhancement of WEPGs. The most relevant indicator to aroma release is e3/e1 under critical strain.
Whereas water–ethanol hybrid gels present an opportunity to realize aroma enhancement, translating hypothesis into practice is limited by poorly defined viscoelastic characteristics of those gels. In this work, the linear and non-linear rheological properties of water–ethanol hybrid pectin gels (WEPGs) were studied. Those WEPGs are physical gels in nature and the WEPG of 28.6% v/v ethanol differs basically from those of higher ethanol concentrations in the gel strength, resistance to deformation and non-linear properties. The retention of isopentyl acetate of WEPGs is dramatically improved by increasing the ethanol concentration to 33.3% v/v in the co-solvent system, but it is not further improved at 37.5% v/v. The cluster analysis reveals strong positive correlations between the isopentyl acetate release concentration and v3/v1 and absolute value of S/T ratio under 100% strain, suggesting the non-linear rheological responses of WEPGs have to be taken into account for which the enhancement of aroma is desired.
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Affiliation(s)
- Yuan Tian
- Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, College of Food Science, Southwest University, Chongqing 400715, China
- Institute of Microbiology, Heilongjiang Academy of Sciences, Harbin 150010, China
| | - Qinghui Song
- Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, College of Food Science, Southwest University, Chongqing 400715, China
| | - Zhenjun Liu
- Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, College of Food Science, Southwest University, Chongqing 400715, China
| | - Fayin Ye
- Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, College of Food Science, Southwest University, Chongqing 400715, China
| | - Yun Zhou
- Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, College of Food Science, Southwest University, Chongqing 400715, China
- Corresponding authors.
| | - Guohua Zhao
- Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, College of Food Science, Southwest University, Chongqing 400715, China
- Corresponding authors.
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Lu J, Fang Q, Ma N, Yang W, Zhang L, Huang T. Gelation behaviour of fish skin gelatin in the presence of methanol‐water and ethanol‐water solvent system. Int J Food Sci Technol 2021. [DOI: 10.1111/ijfs.15522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Jinpei Lu
- College of Food and Pharmaceutical Sciences Ningbo University Ningbo China
| | - Qi Fang
- College of Food and Pharmaceutical Sciences Ningbo University Ningbo China
| | - Nao Ma
- College of Food and Pharmaceutical Sciences Ningbo University Ningbo China
| | - Wenge Yang
- College of Food and Pharmaceutical Sciences Ningbo University Ningbo China
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province Ningbo University Ningbo China
| | - Lingyue Zhang
- College of Food and Pharmaceutical Sciences Ningbo University Ningbo China
- School of Life Science and Material Chemistry Bioengineering, Ningbo University Ningbo China
| | - Tao Huang
- College of Food and Pharmaceutical Sciences Ningbo University Ningbo China
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province Ningbo University Ningbo China
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Rodrigues DA, Miguel SP, Loureiro J, Ribeiro M, Roque F, Coutinho P. Oromucosal Alginate Films with Zein Nanoparticles as a Novel Delivery System for Digoxin. Pharmaceutics 2021; 13:pharmaceutics13122030. [PMID: 34959312 PMCID: PMC8706652 DOI: 10.3390/pharmaceutics13122030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 11/16/2021] [Accepted: 11/25/2021] [Indexed: 12/30/2022] Open
Abstract
Digoxin is a hydrophobic drug used for the treatment of heart failure that possesses a narrow therapeutic index, which raises safety concerns for toxicity. This is of utmost relevance in specific populations, such as the elderly. This study aimed to demonstrate the potential of the sodium alginate films as buccal drug delivery system containing zein nanoparticles incorporated with digoxin to reduce the number of doses, facilitating the administration with a quick onset of action. The film was prepared using the solvent casting method, whereas nanoparticles by the nanoprecipitation method. The nanoparticles incorporated with digoxin (0.25 mg/mL) exhibited a mean size of 87.20 ± 0.88 nm, a polydispersity index of 0.23 ± 0.00, and a zeta potential of 21.23 ± 0.07 mV. Digoxin was successfully encapsulated into zein nanoparticles with an encapsulation efficiency of 91% (±0.00). Films with/without glycerol and with different concentrations of ethanol were produced. The sodium alginate (SA) films with 10% ethanol demonstrated good performance for swelling (maximum of 1474%) and mechanical properties, with a mean tensile strength of 0.40 ± 0.04 MPa and an elongation at break of 27.85% (±0.58), compatible with drug delivery application into the buccal mucosa. The current study suggests that SA films with digoxin-loaded zein nanoparticles can be an effective alternative to the dosage forms available on the market for digoxin administration.
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Affiliation(s)
- Daniela A. Rodrigues
- Center of Potential and Innovation in Natural Resources, Research Unit for Inland Development, Polytechnic Institute of Guarda (CPIRN-UDI/IPG), Avenida Dr. Francisco de Sá Carneiro, No. 50, 6300-559 Guarda, Portugal; (D.A.R.); (S.P.M.); (J.L.); (M.R.); (F.R.)
| | - Sónia P. Miguel
- Center of Potential and Innovation in Natural Resources, Research Unit for Inland Development, Polytechnic Institute of Guarda (CPIRN-UDI/IPG), Avenida Dr. Francisco de Sá Carneiro, No. 50, 6300-559 Guarda, Portugal; (D.A.R.); (S.P.M.); (J.L.); (M.R.); (F.R.)
- Health Sciences Research Centre, University of Beira Interior (CICS-UBI), Avenida Infante D. Henrique, 6200-506 Covilhã, Portugal
| | - Jorge Loureiro
- Center of Potential and Innovation in Natural Resources, Research Unit for Inland Development, Polytechnic Institute of Guarda (CPIRN-UDI/IPG), Avenida Dr. Francisco de Sá Carneiro, No. 50, 6300-559 Guarda, Portugal; (D.A.R.); (S.P.M.); (J.L.); (M.R.); (F.R.)
| | - Maximiano Ribeiro
- Center of Potential and Innovation in Natural Resources, Research Unit for Inland Development, Polytechnic Institute of Guarda (CPIRN-UDI/IPG), Avenida Dr. Francisco de Sá Carneiro, No. 50, 6300-559 Guarda, Portugal; (D.A.R.); (S.P.M.); (J.L.); (M.R.); (F.R.)
- Health Sciences Research Centre, University of Beira Interior (CICS-UBI), Avenida Infante D. Henrique, 6200-506 Covilhã, Portugal
| | - Fátima Roque
- Center of Potential and Innovation in Natural Resources, Research Unit for Inland Development, Polytechnic Institute of Guarda (CPIRN-UDI/IPG), Avenida Dr. Francisco de Sá Carneiro, No. 50, 6300-559 Guarda, Portugal; (D.A.R.); (S.P.M.); (J.L.); (M.R.); (F.R.)
- Health Sciences Research Centre, University of Beira Interior (CICS-UBI), Avenida Infante D. Henrique, 6200-506 Covilhã, Portugal
| | - Paula Coutinho
- Center of Potential and Innovation in Natural Resources, Research Unit for Inland Development, Polytechnic Institute of Guarda (CPIRN-UDI/IPG), Avenida Dr. Francisco de Sá Carneiro, No. 50, 6300-559 Guarda, Portugal; (D.A.R.); (S.P.M.); (J.L.); (M.R.); (F.R.)
- Health Sciences Research Centre, University of Beira Interior (CICS-UBI), Avenida Infante D. Henrique, 6200-506 Covilhã, Portugal
- Correspondence: ; Tel.: +351-965544187
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Influence of the Impregnation Technique on the Release of Esomeprazole from Various Bioaerogels. Polymers (Basel) 2021; 13:polym13111882. [PMID: 34204041 PMCID: PMC8201251 DOI: 10.3390/polym13111882] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 05/27/2021] [Accepted: 06/03/2021] [Indexed: 12/16/2022] Open
Abstract
The presented study shows the possibility of using bioaerogels, namely neat alginate, pectin, chitosan aerogels, and alginate and pectin aerogels coated with chitosan, as drug delivery systems for esomeprazole. Two different techniques were used for the impregnation of esomeprazole: Supercritical impregnation, and diffusion via ethanol during the sol-gel synthesis. The prepared samples were characterized by employing N2 adsorption-desorption analysis, TGA/DSC, and FTIR. The achieved loadings were satisfactory for all the tested samples and showed to be dependent on the technique used for impregnation. In all cases, higher loadings were achieved when impregnation via diffusion from ethanol was used. Extensive release studies were performed for all impregnated samples. The in vitro dissolution profiles were found to be dependent on the carrier and impregnation method used. Most importantly, in all cases more controlled and delayed release was achieved with the bioaerogels compared to using pure esomeprazole.
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Polysaccharide-based aerogels for thermal insulation and superinsulation: An overview. Carbohydr Polym 2021; 266:118130. [PMID: 34044946 DOI: 10.1016/j.carbpol.2021.118130] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/13/2021] [Accepted: 04/24/2021] [Indexed: 02/02/2023]
Abstract
To reduce energy losses due to the insufficient thermal insulation is one of the current "hot" topics. Various commercial porous materials are used with the best conductivity around 0.03-0.04 W/(m·K). Aerogels are the only known materials with "intrinsic" thermal superinsulating properties, i.e. with thermal conductivity below that of air in ambient conditions (0.025 W/(m·K)). The classical thermal superinsulating aerogels are based on silica and some synthetic polymers, with conductivity 0.014-0.018 W/(m·K). Aerogels based on natural polymers are new materials created at the beginning of the 21st century. Can bio-aerogels possess thermal superinsulating properties? What are the bottlenecks in the development of bio-aerogels as new high-performance thermal insulationing materials? We try to answer these questions by analyzing thermal conductivity of bio-aerogels reported in literature.
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Gryshkov O, Mutsenko V, Tarusin D, Khayyat D, Naujok O, Riabchenko E, Nemirovska Y, Danilov A, Petrenko AY, Glasmacher B. Coaxial Alginate Hydrogels: From Self-Assembled 3D Cellular Constructs to Long-Term Storage. Int J Mol Sci 2021; 22:3096. [PMID: 33803546 PMCID: PMC8003018 DOI: 10.3390/ijms22063096] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Accepted: 03/16/2021] [Indexed: 12/22/2022] Open
Abstract
Alginate as a versatile naturally occurring biomaterial has found widespread use in the biomedical field due to its unique features such as biocompatibility and biodegradability. The ability of its semipermeable hydrogels to provide a favourable microenvironment for clinically relevant cells made alginate encapsulation a leading technology for immunoisolation, 3D culture, cryopreservation as well as cell and drug delivery. The aim of this work is the evaluation of structural properties and swelling behaviour of the core-shell capsules for the encapsulation of multipotent stromal cells (MSCs), their 3D culture and cryopreservation using slow freezing. The cells were encapsulated in core-shell capsules using coaxial electrospraying, cultured for 35 days and cryopreserved. Cell viability, metabolic activity and cell-cell interactions were analysed. Cryopreservation of MSCs-laden core-shell capsules was performed according to parameters pre-selected on cell-free capsules. The results suggest that core-shell capsules produced from the low viscosity high-G alginate are superior to high-M ones in terms of stability during in vitro culture, as well as to solid beads in terms of promoting formation of viable self-assembled cellular structures and maintenance of MSCs functionality on a long-term basis. The application of 0.3 M sucrose demonstrated a beneficial effect on the integrity of capsules and viability of formed 3D cell assemblies, as compared to 10% dimethyl sulfoxide (DMSO) alone. The proposed workflow from the preparation of core-shell capsules with self-assembled cellular structures to the cryopreservation appears to be a promising strategy for their off-the-shelf availability.
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Affiliation(s)
- Oleksandr Gryshkov
- Institute for Multiphase Processes, Leibniz University Hannover, An der Universität 1, Building 8143, 30823 Garbsen, Germany; (V.M.); (D.K.); (B.G.)
- Lower Saxony Centre for Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625 Hannover, Germany
| | - Vitalii Mutsenko
- Institute for Multiphase Processes, Leibniz University Hannover, An der Universität 1, Building 8143, 30823 Garbsen, Germany; (V.M.); (D.K.); (B.G.)
- Lower Saxony Centre for Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625 Hannover, Germany
| | - Dmytro Tarusin
- Institute for Problems of Cryobiology and Cryomedicine of the National Academy of Sciences of Ukraine, 23 Pereyaslavsky Street, 61015 Kharkiv, Ukraine; (D.T.); (Y.N.); (A.Y.P.)
| | - Diaa Khayyat
- Institute for Multiphase Processes, Leibniz University Hannover, An der Universität 1, Building 8143, 30823 Garbsen, Germany; (V.M.); (D.K.); (B.G.)
- Lower Saxony Centre for Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625 Hannover, Germany
| | - Ortwin Naujok
- Institute of Clinical Biochemistry, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany;
| | - Ekaterina Riabchenko
- Institute for Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia; (E.R.); (A.D.)
| | - Yuliia Nemirovska
- Institute for Problems of Cryobiology and Cryomedicine of the National Academy of Sciences of Ukraine, 23 Pereyaslavsky Street, 61015 Kharkiv, Ukraine; (D.T.); (Y.N.); (A.Y.P.)
| | - Arseny Danilov
- Institute for Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia; (E.R.); (A.D.)
| | - Alexander Y. Petrenko
- Institute for Problems of Cryobiology and Cryomedicine of the National Academy of Sciences of Ukraine, 23 Pereyaslavsky Street, 61015 Kharkiv, Ukraine; (D.T.); (Y.N.); (A.Y.P.)
| | - Birgit Glasmacher
- Institute for Multiphase Processes, Leibniz University Hannover, An der Universität 1, Building 8143, 30823 Garbsen, Germany; (V.M.); (D.K.); (B.G.)
- Lower Saxony Centre for Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625 Hannover, Germany
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Budtova T, Aguilera DA, Beluns S, Berglund L, Chartier C, Espinosa E, Gaidukovs S, Klimek-Kopyra A, Kmita A, Lachowicz D, Liebner F, Platnieks O, Rodríguez A, Tinoco Navarro LK, Zou F, Buwalda SJ. Biorefinery Approach for Aerogels. Polymers (Basel) 2020; 12:E2779. [PMID: 33255498 PMCID: PMC7760295 DOI: 10.3390/polym12122779] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 11/20/2020] [Accepted: 11/21/2020] [Indexed: 12/30/2022] Open
Abstract
According to the International Energy Agency, biorefinery is "the sustainable processing of biomass into a spectrum of marketable bio-based products (chemicals, materials) and bioenergy (fuels, power, heat)". In this review, we survey how the biorefinery approach can be applied to highly porous and nanostructured materials, namely aerogels. Historically, aerogels were first developed using inorganic matter. Subsequently, synthetic polymers were also employed. At the beginning of the 21st century, new aerogels were created based on biomass. Which sources of biomass can be used to make aerogels and how? This review answers these questions, paying special attention to bio-aerogels' environmental and biomedical applications. The article is a result of fruitful exchanges in the frame of the European project COST Action "CA 18125 AERoGELS: Advanced Engineering and Research of aeroGels for Environment and Life Sciences".
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Affiliation(s)
- Tatiana Budtova
- MINES ParisTech, Center for Materials Forming (CEMEF), PSL Research University, UMR CNRS 7635, CS 10207, 06904 Sophia Antipolis, France; (D.A.A.); (C.C.); (F.Z.)
| | - Daniel Antonio Aguilera
- MINES ParisTech, Center for Materials Forming (CEMEF), PSL Research University, UMR CNRS 7635, CS 10207, 06904 Sophia Antipolis, France; (D.A.A.); (C.C.); (F.Z.)
| | - Sergejs Beluns
- Faculty of Materials Science and Applied Chemistry, Institute of Polymer Materials, Riga Technical University, P.Valdena 3/7, LV, 1048 Riga, Latvia; (S.B.); (S.G.); (O.P.)
| | - Linn Berglund
- Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-971 87 Luleå, Sweden;
| | - Coraline Chartier
- MINES ParisTech, Center for Materials Forming (CEMEF), PSL Research University, UMR CNRS 7635, CS 10207, 06904 Sophia Antipolis, France; (D.A.A.); (C.C.); (F.Z.)
| | - Eduardo Espinosa
- Bioagres Group, Chemical Engineering Department, Faculty of Science, Universidad de Córdoba, Campus of Rabanales, 14014 Córdoba, Spain; (E.E.); (A.R.)
| | - Sergejs Gaidukovs
- Faculty of Materials Science and Applied Chemistry, Institute of Polymer Materials, Riga Technical University, P.Valdena 3/7, LV, 1048 Riga, Latvia; (S.B.); (S.G.); (O.P.)
| | - Agnieszka Klimek-Kopyra
- Department of Agroecology and Plant Production, Faculty of Agriculture and Economics, University of Agriculture, Aleja Mickieiwcza 21, 31-120 Kraków, Poland;
| | - Angelika Kmita
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Krakow, Poland; (A.K.); (D.L.)
| | - Dorota Lachowicz
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Krakow, Poland; (A.K.); (D.L.)
| | - Falk Liebner
- Department of Chemistry, Institute for Chemistry of Renewable Resources, University of Natural Resources and Life Sciences, Vienna (BOKU), Konrad Lorenz Straße 24, A-3430 Tulln an der Donau, Austria;
| | - Oskars Platnieks
- Faculty of Materials Science and Applied Chemistry, Institute of Polymer Materials, Riga Technical University, P.Valdena 3/7, LV, 1048 Riga, Latvia; (S.B.); (S.G.); (O.P.)
| | - Alejandro Rodríguez
- Bioagres Group, Chemical Engineering Department, Faculty of Science, Universidad de Córdoba, Campus of Rabanales, 14014 Córdoba, Spain; (E.E.); (A.R.)
| | - Lizeth Katherine Tinoco Navarro
- CEITEC-VUT Central European Institute of Technology—Brno university of Technology, Purkyňova 123, 612 00 Brno-Královo Pole, Czech Republic;
| | - Fangxin Zou
- MINES ParisTech, Center for Materials Forming (CEMEF), PSL Research University, UMR CNRS 7635, CS 10207, 06904 Sophia Antipolis, France; (D.A.A.); (C.C.); (F.Z.)
| | - Sytze J. Buwalda
- MINES ParisTech, Center for Materials Forming (CEMEF), PSL Research University, UMR CNRS 7635, CS 10207, 06904 Sophia Antipolis, France; (D.A.A.); (C.C.); (F.Z.)
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Tabernero A, Cardea S. Microbial Exopolysaccharides as Drug Carriers. Polymers (Basel) 2020; 12:E2142. [PMID: 32961830 PMCID: PMC7570138 DOI: 10.3390/polym12092142] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/17/2020] [Accepted: 09/17/2020] [Indexed: 12/18/2022] Open
Abstract
Microbial exopolysaccharides are peculiar polymers that are produced by living organisms and protect them against environmental factors. These polymers are industrially recovered from the medium culture after performing a fermentative process. These materials are biocompatible and biodegradable, possessing specific and beneficial properties for biomedical drug delivery systems. They can have antitumor activity, they can produce hydrogels with different characteristics due to their molecular structure and functional groups, and they can even produce nanoparticles via a self-assembly phenomenon. This review studies the potential use of exopolysaccharides as carriers for drug delivery systems, covering their versatility and their vast possibilities to produce particles, fibers, scaffolds, hydrogels, and aerogels with different strategies and methodologies. Moreover, the main properties of exopolysaccharides are explained, providing information to achieve an adequate carrier selection depending on the final application.
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Affiliation(s)
- Antonio Tabernero
- Department of Chemical Engineering, University of Salamanca, Plaza los Caídos s/n, 37008 Salamanca, Spain;
| | - Stefano Cardea
- Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Italy
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Santos PD, Viganó J, Furtado GDF, Cunha RL, Hubinger MD, Rezende CA, Martínez J. Production of resveratrol loaded alginate aerogel: Characterization, mathematical modeling, and study of impregnation. J Supercrit Fluids 2020. [DOI: 10.1016/j.supflu.2020.104882] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Auriemma G, Russo P, Del Gaudio P, García-González CA, Landín M, Aquino RP. Technologies and Formulation Design of Polysaccharide-Based Hydrogels for Drug Delivery. Molecules 2020; 25:E3156. [PMID: 32664256 PMCID: PMC7397281 DOI: 10.3390/molecules25143156] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 06/29/2020] [Accepted: 07/02/2020] [Indexed: 01/31/2023] Open
Abstract
Polysaccharide-based hydrogel particles (PbHPs) are very promising carriers aiming to control and target the release of drugs with different physico-chemical properties. Such delivery systems can offer benefits through the proper encapsulation of many drugs (non-steroidal and steroidal anti-inflammatory drugs, antibiotics, etc) ensuring their proper release and targeting. This review discusses the different phases involved in the production of PbHPs in pharmaceutical technology, such as droplet formation (SOL phase), sol-gel transition of the droplets (GEL phase) and drying, as well as the different methods available for droplet production with a special focus on prilling technique. In addition, an overview of the various droplet gelation methods with particular emphasis on ionic cross-linking of several polysaccharides enabling the formation of particles with inner highly porous network or nanofibrillar structure is given. Moreover, a detailed survey of the different inner texture, in xerogels, cryogels or aerogels, each with specific arrangement and properties, which can be obtained with different drying methods, is presented. Various case studies are reported to highlight the most appropriate application of such systems in pharmaceutical field. We also describe the challenges to be faced for the breakthrough towards clinic studies and, finally, the market, focusing on the useful approach of safety-by-design (SbD).
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Affiliation(s)
- Giulia Auriemma
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, I—84084 Fisciano (SA), Italy; (G.A.); (P.R.); (P.D.G.)
| | - Paola Russo
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, I—84084 Fisciano (SA), Italy; (G.A.); (P.R.); (P.D.G.)
| | - Pasquale Del Gaudio
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, I—84084 Fisciano (SA), Italy; (G.A.); (P.R.); (P.D.G.)
| | - Carlos A. García-González
- Department of Pharmacy and Pharmaceutical Technology, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain; (C.A.G.-G.); (M.L.)
| | - Mariana Landín
- Department of Pharmacy and Pharmaceutical Technology, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain; (C.A.G.-G.); (M.L.)
| | - Rita Patrizia Aquino
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, I—84084 Fisciano (SA), Italy; (G.A.); (P.R.); (P.D.G.)
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Impregnation of passion fruit bagasse extract in alginate aerogel microparticles. Int J Biol Macromol 2020; 155:1060-1068. [DOI: 10.1016/j.ijbiomac.2019.11.070] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Revised: 10/24/2019] [Accepted: 11/07/2019] [Indexed: 11/22/2022]
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29
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Zhou Y, Wu L, Tian Y, Li R, Zhu C, Zhao G, Cheng Y. A novel low-alkali konjac gel induced by ethanol to modulate sodium release. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2020.105653] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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New Trends in Bio-Based Aerogels. Pharmaceutics 2020; 12:pharmaceutics12050449. [PMID: 32414217 PMCID: PMC7284463 DOI: 10.3390/pharmaceutics12050449] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 04/27/2020] [Accepted: 05/11/2020] [Indexed: 01/16/2023] Open
Abstract
(1) Background: The fascinating properties of currently synthesized aerogels associated with the flexible approach of sol-gel chemistry play an important role in the emergence of special biomedical applications. Although it is increasingly known and mentioned, the potential of aerogels in the medical field is not sufficiently explored. Interest in aerogels has increased greatly in recent decades due to their special properties, such as high surface area, excellent thermal and acoustic properties, low density and thermal conductivity, high porosity, flame resistance and humidity, and low refractive index and dielectric constant. On the other hand, high manufacturing costs and poor mechanical strength limit the growth of the market. (2) Results: In this paper, we analyze more than 180 articles from recent literature studies focused on the dynamics of aerogels research to summarize the technologies used in manufacturing and the properties of materials based on natural polymers from renewable sources. Biomedical applications of these bio-based materials are also introduced. (3) Conclusions: Due to their complementary functionalities (bioactivity, biocompatibility, biodegradability, and unique chemistry), bio-based materials provide a vast capability for utilization in the field of interdisciplinary and multidisciplinary scientific research.
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Guerrero-Alburquerque N, Zhao S, Adilien N, Koebel MM, Lattuada M, Malfait WJ. Strong, Machinable, and Insulating Chitosan-Urea Aerogels: Toward Ambient Pressure Drying of Biopolymer Aerogel Monoliths. ACS APPLIED MATERIALS & INTERFACES 2020; 12:22037-22049. [PMID: 32302092 DOI: 10.1021/acsami.0c03047] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Biopolymer aerogels are an emerging class of materials with potential applications in drug delivery, thermal insulation, separation, and filtration. Chitosan is of particular interest as a sustainable, biocompatible, and abundant raw material. Here, we present urea-modified chitosan aerogels with a high surface area and excellent thermal and mechanical properties. The irreversible gelation of an acidic chitosan solution is triggered by the thermal decomposition of urea at 80 °C through an increase in pH and, more importantly, the formation of abundant ureido terminal groups. The hydrogels are dried using either supercritical CO2 drying (SCD) or ambient pressure drying (APD) methods to elucidate the influence of the drying process on the final aerogel properties. The hydrogels are exchanged into ethanol prior to SCD, and into ethanol and then heptane prior to APD. The surface chemistry and microstructure are monitored by solid-state NMR and Fourier transform infrared spectroscopy, scanning electron microscopy, and nitrogen sorption. Surprisingly, large monolithic aerogel plates (70 × 70 mm2) can be produced by APD, albeit at a somewhat higher density (0.17-0.42 g/cm3). The as prepared aerogels have thermal conductivities of ∼24 and ∼31 mW/(m·K) and surface areas of 160-170 and 85-230 m2/g, for SCD and APD, respectively. For a primarily biopolymer-based material, these aerogels are exceptionally stable at elevated temperature (TGA) and char and self-extinguish after direct flame exposure. The urea-modified chitosan aerogels display superior mechanical properties compared to traditional silica aerogels, with no brittle rupture up to at least 80% strain, and depending on the chitosan concentration, relatively high E-moduli (1.0-11.6 MPa), and stress at 80% strain values (σ80 of 3.5-17.9 MPa). Remarkably, the aerogel monoliths can be shaped and machined with standard tools, for example, drilling and sawing. This first demonstration to produce monolithic and machinable, mesoporous aerogels from bio-sourced, renewable, and nontoxic precursors, combined with the potential for reduced production cost by means of simple APD, opens up new opportunities for biopolymer aerogel applications and marks an important step toward commercialization of biopolymer aerogels.
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Affiliation(s)
- Natalia Guerrero-Alburquerque
- Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700 Fribourg, Switzerland
| | - Shanyu Zhao
- Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Nour Adilien
- Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Matthias M Koebel
- Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Marco Lattuada
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700 Fribourg, Switzerland
| | - Wim J Malfait
- Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
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Tabernero A, Cardea S. Supercritical carbon dioxide techniques for processing microbial exopolysaccharides used in biomedical applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 112:110940. [PMID: 32409086 DOI: 10.1016/j.msec.2020.110940] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 03/24/2020] [Accepted: 04/06/2020] [Indexed: 12/14/2022]
Abstract
Microbial exopolysaccharides are polymers that show a great potential for biomedical applications, such as tissue engineering applications and drug delivery, due to their biocompatibility, biodegradability and their gelling properties. These polysaccharides are obtained from a microorganism culture with a relatively straightforward downstream process thanks to their extracellular character, and can be processed to obtain aerogels, fibers and micro- or nano-particles with conventional techniques. However, these techniques present several disadvantages in that they involve time-consuming processes and the use of toxic solvents. Supercritical carbon dioxide techniques can overcome these drawbacks, but their use for processing microbial exopolysaccharides is not extended in the scientific community. This review describes the most frequently used exopolysaccharides in biomedical applications and how they can be obtained, as well as the different supercritical carbon dioxide techniques that can be used for processing them and their challenges. Specifically, high pressure shows a great potential to process and sterilize exopolysaccharide biomaterials for biomedical applications (e.g. tissue engineering or drug delivery systems) in spite of the disadvantage concerning the hydrophilicity of this type of polymers.
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Affiliation(s)
- Antonio Tabernero
- Department of Chemical Engineering, University of Salamanca, Plaza los Caídos s/n, 37008 Salamanca, SA, Spain
| | - Stefano Cardea
- Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy.
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Preparation and Characterization of Chitosan-Coated Pectin Aerogels: Curcumin Case Study. Molecules 2020; 25:molecules25051187. [PMID: 32155739 PMCID: PMC7179465 DOI: 10.3390/molecules25051187] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 03/02/2020] [Accepted: 03/05/2020] [Indexed: 11/19/2022] Open
Abstract
The following study describes the preparation of pectin aerogels and pectin aerogels coated with an external layer of chitosan. For the preparation of chitosan-coated pectin aerogels, a modified coating procedure was employed. Since pectin as well as pectin aerogels are highly water soluble, a function of chitosan coating is to slow down the dissolution of pectin and consequently the release of the active substances. Textural properties, surface morphologies, thermal properties, and functional groups of prepared aerogels were determined. Results indicated that the coating procedure affected the textural properties of pectin aerogels, resulting in smaller specific surface areas of 276 m2/g, compared to 441 m2/g. However, chitosan-coated pectin aerogels still retained favorable properties for carriers of active substances. The case study for prepared aerogels was conducted with curcumin. Prior to in-vitro release studies, swelling studies were performed. Curcumin’s dissolution from both aerogels showed to be successful. Pectin aerogels released curcumin in 3 h showing a burst release profile. Chitosan-coated pectin aerogels prolonged curcumin release up to 24 h, thus showing a controlled release profile.
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López-Iglesias C, Barros J, Ardao I, Gurikov P, Monteiro FJ, Smirnova I, Alvarez-Lorenzo C, García-González CA. Jet Cutting Technique for the Production of Chitosan Aerogel Microparticles Loaded with Vancomycin. Polymers (Basel) 2020; 12:polym12020273. [PMID: 32013071 PMCID: PMC7077406 DOI: 10.3390/polym12020273] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 01/25/2020] [Accepted: 01/26/2020] [Indexed: 01/06/2023] Open
Abstract
Biopolymer-based aerogels can be obtained by supercritical drying of wet gels and endowed with outstanding properties for biomedical applications. Namely, polysaccharide-based aerogels in the form of microparticles are of special interest for wound treatment and can also be loaded with bioactive agents to improve the healing process. However, the production of the precursor gel may be limited by the viscosity of the polysaccharide initial solution. The jet cutting technique is regarded as a suitable processing technique to overcome this problem. In this work, the technological combination of jet cutting and supercritical drying of gels was assessed to produce chitosan aerogel microparticles loaded with vancomycin HCl (antimicrobial agent) for wound healing purposes. The resulting aerogel formulation was evaluated in terms of morphology, textural properties, drug loading, and release profile. Aerogels were also tested for wound application in terms of exudate sorption capacity, antimicrobial activity, hemocompatibility, and cytocompatibility. Overall, the microparticles had excellent textural properties, absorbed high amounts of exudate, and controlled the release of vancomycin HCl, providing sustained antimicrobial activity.
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Affiliation(s)
- Clara López-Iglesias
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, I+D Farma group (GI-1645), Faculty of Pharmacy, Agrupación Estratégica de Materiales (AeMAT) and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain; (C.L.-I.); (C.A.-L.)
| | - Joana Barros
- Instituto de Investigação e Inovação em Saúde (i3S), Instituto Nacional de Engenharia Biomédica (INEB) and Faculdade de Engenharia Universidade do Porto (FEUP), Universidade do Porto, 4200-135 Porto, Portugal; (J.B.); (F.J.M.)
| | - Inés Ardao
- BioFarma Research group, Center for Research in Molecular Medicine and Chronic Diseases (CiMUS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain;
| | - Pavel Gurikov
- Laboratory for Development and Modelling of Novel Nanoporous Materials, Eißendorfer Str. 38, 21073 Hamburg, Germany;
| | - Fernando J. Monteiro
- Instituto de Investigação e Inovação em Saúde (i3S), Instituto Nacional de Engenharia Biomédica (INEB) and Faculdade de Engenharia Universidade do Porto (FEUP), Universidade do Porto, 4200-135 Porto, Portugal; (J.B.); (F.J.M.)
| | - Irina Smirnova
- Institute of Thermal Separation Processes, Hamburg University of Technology, Eißendorfer Str. 38, 21073 Hamburg, Germany;
| | - Carmen Alvarez-Lorenzo
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, I+D Farma group (GI-1645), Faculty of Pharmacy, Agrupación Estratégica de Materiales (AeMAT) and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain; (C.L.-I.); (C.A.-L.)
| | - Carlos A. García-González
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, I+D Farma group (GI-1645), Faculty of Pharmacy, Agrupación Estratégica de Materiales (AeMAT) and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain; (C.L.-I.); (C.A.-L.)
- Correspondence: ; Tel.: +34-881-814882
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Role of rheological properties on physical chitosan aerogels obtained by supercritical drying. Carbohydr Polym 2020; 233:115850. [PMID: 32059901 DOI: 10.1016/j.carbpol.2020.115850] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 01/01/2020] [Accepted: 01/08/2020] [Indexed: 12/16/2022]
Abstract
Chitosan aerogels were obtained after using supercritical carbon dioxide to dry physical hydrogels, studying the effect of the rheological behavior of hydrogels and solutions on the final aerogels properties. An increase on the solutions pseudoplasticity increased the subsequent hydrogels physical entanglement, without showing a significant effect on aerogels morphology (nanoporous) and textural properties (pores of about 10 nm). However, an increase of hydrogel physical entanglement promoted the formation of aerogels with a higher compressive strength (from 0.2 to 0.80 MPa) and higher thermal decomposition range, while decreasing the porosity (from 90 % to 94 %). Aerogels stress-strain responses were also successfully fitted using a hyperelastic equation with three adjustable parameters (Yeoh), showing that this type of models must be taken into account when large stresses are studied.
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Nešić A, Cabrera-Barjas G, Dimitrijević-Branković S, Davidović S, Radovanović N, Delattre C. Prospect of Polysaccharide-Based Materials as Advanced Food Packaging. Molecules 2019; 25:E135. [PMID: 31905753 PMCID: PMC6983128 DOI: 10.3390/molecules25010135] [Citation(s) in RCA: 104] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 12/22/2019] [Accepted: 12/26/2019] [Indexed: 11/16/2022] Open
Abstract
The use of polysaccharide-based materials presents an eco-friendly technological solution, by reducing dependence on fossil resources while reducing a product's carbon footprint, when compared to conventional plastic packaging materials. This review discusses the potential of polysaccharides as a raw material to produce multifunctional materials for food packaging applications. The covered areas include the recent innovations and properties of the polysaccharide-based materials. Emphasis is given to hemicelluloses, marine polysaccharides, and bacterial exopolysaccharides and their potential application in the latest trends of food packaging materials, including edible coatings, intelligent films, and thermo-insulated aerogel packaging.
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Affiliation(s)
- Aleksandra Nešić
- Vinca Institute for Nuclear Sciences, University of Belgrade, Mike Petrovica-Alasa 12-14, 11000 Belgrade, Serbia;
- Unidad de Desarrollo Tecnológico, Universidad de Concepcion, Avda. Cordillera No. 2634, Parque Industrial Coronel, Coronel 4190000, Chile;
| | - Gustavo Cabrera-Barjas
- Unidad de Desarrollo Tecnológico, Universidad de Concepcion, Avda. Cordillera No. 2634, Parque Industrial Coronel, Coronel 4190000, Chile;
| | | | - Sladjana Davidović
- Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia;
| | - Neda Radovanović
- Inovation Centre of Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia;
| | - Cédric Delattre
- CNRS, SIGMA Clermont, Institut Pascal, Université Clermont Auvergne, F-63000 Clermont-Ferrand, France;
- Institute Universitaire de France (IUF), 1 rue Descartes, 75005 Paris, France
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Preparation and characterization of polysaccharide - silica hybrid aerogels. Sci Rep 2019; 9:16492. [PMID: 31712716 PMCID: PMC6848218 DOI: 10.1038/s41598-019-52974-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 10/24/2019] [Indexed: 11/08/2022] Open
Abstract
Hybrid aerogels based on polysaccharides - silica were prepared and characterized. Tetramethylorthosilicate (TMOS) was used as inorganic precursor and various polysaccharides (alginate, pectin, xanthan and guar) were used as organic precursors. TMOS was added to polysaccharide aqueous solutions, resulting in stable wet gels. There were no additional chemicals or cross-linkers in the process. Produced wet gels were dried under supercritical conditions with CO2 in order to preserve their structure. The nitrogen adsorption results were compared to pure polysaccharide aerogels, prepared in our previous research. It is shown, that the addition of silica to pectin, xanthan, alginate and guar significantly improved their structural properties, primarily seen in the drastic increase of the surface area. Guar-silica aerogels reached the highest surface area of 679 m2 g−1. The thermal properties, including thermal degradation and thermal conductivity were highly improved. Among the prepared hybrid aerogels, pectin-silica samples had the lowest thermal conductivity of 19 mWm−1 K−1.
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Gurikov P, S. P. R, Griffin JS, Steiner SA, Smirnova I. 110th Anniversary: Solvent Exchange in the Processing of Biopolymer Aerogels: Current Status and Open Questions. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b02967] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Pavel Gurikov
- Hamburg University of Technology, Institute of Thermal Separation Processes, Eißendorfer Str. 38, 21073 Hamburg, Germany
| | - Raman S. P.
- Hamburg University of Technology, Institute of Thermal Separation Processes, Eißendorfer Str. 38, 21073 Hamburg, Germany
| | - Justin S. Griffin
- Aerogel Technologies, LLC 1 Westinghouse Plaza, D157, Boston, Massachusetts 02136, United States of America
| | - Stephen A. Steiner
- Aerogel Technologies, LLC 1 Westinghouse Plaza, D157, Boston, Massachusetts 02136, United States of America
| | - Irina Smirnova
- Hamburg University of Technology, Institute of Thermal Separation Processes, Eißendorfer Str. 38, 21073 Hamburg, Germany
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Asim N, Badiei M, Alghoul MA, Mohammad M, Fudholi A, Akhtaruzzaman M, Amin N, Sopian K. Biomass and Industrial Wastes as Resource Materials for Aerogel Preparation: Opportunities, Challenges, and Research Directions. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b02661] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Nilofar Asim
- Solar Energy Research Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
| | - Marzieh Badiei
- Independent Researcher, Razavi 16, 91777-35843 Mashhad, Iran
| | - Mohammad A. Alghoul
- Center of Research Excellence in Renewable Energy Research Institute, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia
| | - Masita Mohammad
- Solar Energy Research Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
| | - Ahmad Fudholi
- Solar Energy Research Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
| | - Md Akhtaruzzaman
- Solar Energy Research Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
| | - Nowshad Amin
- Institute of Sustainable Energy, Universiti Tenaga Nasional, 43000 Kajang, Selangor, Malaysia
| | - Kamaruzzaman Sopian
- Solar Energy Research Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
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Takeshita S, Sadeghpour A, Malfait WJ, Konishi A, Otake K, Yoda S. Formation of Nanofibrous Structure in Biopolymer Aerogel during Supercritical CO 2 Processing: The Case of Chitosan Aerogel. Biomacromolecules 2019; 20:2051-2057. [PMID: 30908038 DOI: 10.1021/acs.biomac.9b00246] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Supercritical drying is widely considered as the gold standard to produce aerogels that preserve the microstructure of the gels, but we have found this is not always the case. Chitosan aerogel, one of the emerging biopolymer aerogels, was prepared by chemical cross-linking gelation, followed by solvent exchange with methanol and supercritical drying using CO2. Small-angle X-ray scattering analysis shows that the structure of the wet gel, which consists of Gaussian chains of individual molecular strands, converts into a nanofibrous network during CO2 processing. In situ observation reveals a drastic shrinkage of the gel in CO2, demonstrating that physical coagulation caused by the low affinity between chitosan and CO2 is the main structure-forming step. These results challenge the common perception of supercritical drying: it is no longer an inactive drying method, but rather an active nanostructure forming a tool to produce porous biopolymer materials with tailored structure and properties.
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Affiliation(s)
- Satoru Takeshita
- Research Institute for Chemical Process Technology , National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba 3058565 , Japan
| | - Amin Sadeghpour
- Center for X-ray Analytics , Empa, Swiss Federal Laboratories for Materials Science and Technology , St. Gallen CH-9014 , Switzerland
| | - Wim J Malfait
- Laboratory for Building Energy Materials and Components , Empa, Swiss Federal Laboratories for Materials Science and Technology , Dübendorf CH-8600 , Switzerland
| | - Arata Konishi
- Department of Industrial Chemistry , Tokyo University of Science , Tokyo 1628601 , Japan
| | - Katsuto Otake
- Department of Industrial Chemistry , Tokyo University of Science , Tokyo 1628601 , Japan
| | - Satoshi Yoda
- Research Institute for Chemical Process Technology , National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba 3058565 , Japan
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Rodríguez-Dorado R, López-Iglesias C, García-González CA, Auriemma G, Aquino RP, Del Gaudio P. Design of Aerogels, Cryogels and Xerogels of Alginate: Effect of Molecular Weight, Gelation Conditions and Drying Method on Particles' Micromeritics. Molecules 2019; 24:molecules24061049. [PMID: 30884869 PMCID: PMC6471992 DOI: 10.3390/molecules24061049] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 03/13/2019] [Accepted: 03/14/2019] [Indexed: 11/26/2022] Open
Abstract
Processing and shaping of dried gels are of interest in several fields like alginate aerogel beads used as highly porous and nanostructured particles in biomedical applications. The physicochemical properties of the alginate source, the solvent used in the gelation solution and the gel drying method are key parameters influencing the characteristics of the resulting dried gels. In this work, dried gel beads in the form of xerogels, cryogels or aerogels were prepared from alginates of different molecular weights (120 and 180 kDa) and concentrations (1.25, 1.50, 2.0 and 2.25% (w/v)) using different gelation conditions (aqueous and ethanolic CaCl2 solutions) and drying methods (supercritical drying, freeze-drying and oven drying) to obtain particles with a broad range of physicochemical and textural properties. The stability of physicochemical properties of alginate aerogels under storage conditions of 25 °C and 65% relative humidity (ICH-climatic zone II) during 1 and 3 months was studied. Results showed significant effects of the studied processing parameters on the resulting alginate dried gel properties. Stability studies showed small variations in aerogels weight and specific surface area after 3 months of storage, especially, in the case of aerogels produced with medium molecular weight alginate.
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Affiliation(s)
- Rosalía Rodríguez-Dorado
- Department of Pharmacy, University of Salerno, 84084 Fisciano, Italy.
- Drug Discovery and Development, University of Salerno, 84084 Fisciano, Italy.
| | - Clara López-Iglesias
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, R+D Pharma group (GI-1645), Faculty of Pharmacy and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain.
| | - Carlos A García-González
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, R+D Pharma group (GI-1645), Faculty of Pharmacy and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain.
| | - Giulia Auriemma
- Department of Pharmacy, University of Salerno, 84084 Fisciano, Italy.
| | - Rita P Aquino
- Department of Pharmacy, University of Salerno, 84084 Fisciano, Italy.
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da Silva MA, Calabrese V, Schmitt J, Celebi D, Scott JL, Edler KJ. Alcohol induced gelation of TEMPO-oxidized cellulose nanofibril dispersions. SOFT MATTER 2018; 14:9243-9249. [PMID: 30418451 DOI: 10.1039/c8sm01815d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Solvent-induced physical hydrogels of TEMPO-oxidized cellulose nanofibrils (OCNFs) were obtained from aqueous/alcoholic dispersions of fibrils in lower alcohols, namely, methanol, ethanol, 1-propanol and 2-propanol. The sol-gel transition occurs above a critical alcohol concentration of ca. 30 wt% for all alcohols tested. The rheological properties of the hydrogels depend on the nature of the alcohol: for ethanol, 1-propanol and 2-propanol the magnitude of the shear storage modulus follows the alcohol hydrophilicity, whilst methanol produces the weakest gels in the group. Above a second critical concentration, ca. 60 wt% alcohol, phase separation is observed as the gels undergo syneresis. Analysis of small-angle X-ray scattering data shows that the OCNFs may be modelled as rigid rods. In the presence of lower alcohols, attractive interactions between nanofibrils are present and, above the alcohol concentration leading to gelation, an increase of the OCNF cross-section is observed, suggesting alcohol induced aggregation of nanofibrils.
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Affiliation(s)
- Marcelo A da Silva
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
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Nešić A, Gordić M, Davidović S, Radovanović Ž, Nedeljković J, Smirnova I, Gurikov P. Pectin-based nanocomposite aerogels for potential insulated food packaging application. Carbohydr Polym 2018; 195:128-135. [DOI: 10.1016/j.carbpol.2018.04.076] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Revised: 03/20/2018] [Accepted: 04/19/2018] [Indexed: 12/17/2022]
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Thermal conductivity/structure correlations in thermal super-insulating pectin aerogels. Carbohydr Polym 2018; 196:73-81. [DOI: 10.1016/j.carbpol.2018.05.026] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Revised: 03/16/2018] [Accepted: 05/07/2018] [Indexed: 11/15/2022]
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Gurikov P, Smirnova I. Non-Conventional Methods for Gelation of Alginate. Gels 2018; 4:E14. [PMID: 30674790 PMCID: PMC6318612 DOI: 10.3390/gels4010014] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 01/25/2018] [Accepted: 01/26/2018] [Indexed: 11/21/2022] Open
Abstract
This review presents and critically evaluates recent advances in non-conventional gelation method of native alginate. A special focus is given to the following three methods: cryotropic gelation, non-solvent induced phase separation and carbon dioxide induced gelation. A few other gelation approaches are also briefly reviewed. Results are discussed in the context of subsequent freeze and supercritical drying. The methods are selected so as to provide the readers with a range of novel tools and tactics of pore engineering for alginate and other anionic polysaccharides.
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Affiliation(s)
- Pavel Gurikov
- Institute of Thermal Separation Processes, Hamburg University of Technology, Eißendorfer Straße 38, 21073 Hamburg, Germany.
| | - Irina Smirnova
- Institute of Thermal Separation Processes, Hamburg University of Technology, Eißendorfer Straße 38, 21073 Hamburg, Germany.
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48
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Cassanelli M, Norton I, Mills T. Effect of alcohols on gellan gum gel structure: Bridging the molecular level and the three-dimensional network. FOOD STRUCTURE-NETHERLANDS 2017. [DOI: 10.1016/j.foostr.2017.09.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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49
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Horvat G, Xhanari K, Finšgar M, Gradišnik L, Maver U, Knez Ž, Novak Z. Novel ethanol-induced pectin–xanthan aerogel coatings for orthopedic applications. Carbohydr Polym 2017; 166:365-376. [DOI: 10.1016/j.carbpol.2017.03.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 02/13/2017] [Accepted: 03/04/2017] [Indexed: 10/20/2022]
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50
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De Cicco F, Russo P, Reverchon E, García-González CA, Aquino RP, Del Gaudio P. Prilling and supercritical drying: A successful duo to produce core-shell polysaccharide aerogel beads for wound healing. Carbohydr Polym 2016; 147:482-489. [PMID: 27178955 DOI: 10.1016/j.carbpol.2016.04.031] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 03/11/2016] [Accepted: 04/07/2016] [Indexed: 01/15/2023]
Abstract
Bacterial infections often affect the wound, delaying healing and causing areas of necrosis. In this work, an aerogel in form of core-shell particles, able to prolong drug activity on wounds and to be easily removed was developed. Aerogel microcapsules consisted of a core made by amidated pectin hosting doxycycline, an antibiotic drug with a broad spectrum of action, and a shell consisting of high mannuronic content alginate. Particles were obtained by prilling using a coaxial nozzle for drop production and an ethanolic solution of CaCl2 as gelling promoter. The alcogels where dried using supercritical CO2. The influence of polysaccharides and drug concentrations on aerogel properties was evaluated. Spherical particles with high drug encapsulation efficiency (87%) correlated to alginate concentration in the processed liquid feeds were obtained. The release of the drug, mainly concentrated into the pectin core, was prolonged till 48h, and dependent on both drug/pectin ratio and alginate concentration.
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Affiliation(s)
- Felicetta De Cicco
- Department of Pharmacy, University of Salerno, via Giovanni Paolo II, 132 I-84084 Fisciano SA, Italy
| | - Paola Russo
- Department of Pharmacy, University of Salerno, via Giovanni Paolo II, 132 I-84084 Fisciano SA, Italy
| | - Ernesto Reverchon
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132 I-84084 Fisciano SA, Italy
| | - Carlos A García-González
- Department of Pharmacy and Pharmaceutical Technology, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - Rita Patrizia Aquino
- Department of Pharmacy, University of Salerno, via Giovanni Paolo II, 132 I-84084 Fisciano SA, Italy
| | - Pasquale Del Gaudio
- Department of Pharmacy, University of Salerno, via Giovanni Paolo II, 132 I-84084 Fisciano SA, Italy.
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