1
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Wang Y, Wang L, Hu Y, Qin J, Yu B. Design and optimization of ε-poly-l-lysine with specific functions for diverse applications. Int J Biol Macromol 2024; 262:129513. [PMID: 38262828 DOI: 10.1016/j.ijbiomac.2024.129513] [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: 11/01/2023] [Revised: 01/03/2024] [Accepted: 01/13/2024] [Indexed: 01/25/2024]
Abstract
ε-Poly-l-lysine (ε-PL) is a natural homo-poly(amino acid) which can be produced by microorganisms. With the advantages in broad-spectrum antimicrobial activity, biodegradability, and biocompatibility, ε-PL has been widely used as a preservative in the food industry. Different molecular architectures endow ε-PL and ε-PL-based materials with versatile applications. However, the microbial synthesis of ε-PL is currently limited by low efficiencies in genetic engineering and molecular architecture modification. This review presents recent advances in ε-PL production and molecular architecture modification of microbial ε-PL, with a focus on the current challenges and solutions for the improvement of the productivity and diversity of ε-PL. In addition, we highlight recent examples where ε-PL has been applied to expand the versability of edible films and nanoparticles in various applications. Commercial production and the challenges and future research directions in ε-PL biosynthesis are also discussed. Currently, although the main use of ε-PL is as a food preservative, ε-PL and ε-PL-based polymers have shown excellent application potential in biomedical fields. With the development of synthetic biology, the design and synthesis of ε-PL with a customized molecular architecture are possible in the near future. ε-PL-based polymers with specific functions will be a new trend in biopolymer manufacturing.
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Affiliation(s)
- Yi Wang
- CAS Key Laboratory of Microbial Physiological & Metabolic Engineering, State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Limin Wang
- CAS Key Laboratory of Microbial Physiological & Metabolic Engineering, State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China.
| | - Yangfan Hu
- CAS Key Laboratory of Microbial Physiological & Metabolic Engineering, State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Jiayang Qin
- College of Pharmacy, Binzhou Medical University, Yantai 264003, China.
| | - Bo Yu
- CAS Key Laboratory of Microbial Physiological & Metabolic Engineering, State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
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2
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Liu S, Liu W, Yin H, Yang C, Chen J. Improving rhamnolipids production using fermentation-foam fractionation coupling system: cell immobilization and waste frying oil emulsion. Bioprocess Biosyst Eng 2023:10.1007/s00449-023-02890-5. [PMID: 37338581 DOI: 10.1007/s00449-023-02890-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Accepted: 05/30/2023] [Indexed: 06/21/2023]
Abstract
This work focused on the development of an inexpensive carbon source and the improvement of the fermentation-foam fractionation coupling system. The rhamnolipids production capacity of waste frying oil (WFO) was evaluated. The suitable bacterial cultivation of seed liquid and the addition amount of WFO was 16 h and 2% (v/v), respectively. A combined strategy of cell immobilization and oil emulsion avoid cell entrainment inside foam and improves the oil mass transfer rate. The immobilization conditions of bacterial cells into alginate-chitosan-alginate (ACA) microcapsules were optimized using the response surface method (RSM). Under the optimal conditions, rhamnolipids production using batch fermentation with immobilized strain reached 7.18 ± 0.23% g/L. WFO was emulsified into a fermentation medium using rhamnolipids as emulsifier (0.5 g/L). By monitoring dissolved oxygen, 30 mL/min was selected as a suitable air volumetric flow rate for fermentation-foam fractionation coupling operation. The total production and recovery percentage of rhamnolipids were 11.29 ± 0.36 g/L and 95.62 ± 0.38%, respectively.
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Affiliation(s)
- Siyuan Liu
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8 Guangrong Road, DingziGu, Hongqiao District, Tianjin, 300130, China
| | - Wei Liu
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8 Guangrong Road, DingziGu, Hongqiao District, Tianjin, 300130, China.
| | - Hao Yin
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8 Guangrong Road, DingziGu, Hongqiao District, Tianjin, 300130, China
| | - Chunyan Yang
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8 Guangrong Road, DingziGu, Hongqiao District, Tianjin, 300130, China
| | - Jianxin Chen
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8 Guangrong Road, DingziGu, Hongqiao District, Tianjin, 300130, China
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3
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Li C, Gao M, Zheng G, Ma X, Liu X, Yu W. Enhanced quorum sensing capacity via regulating microenvironment to facilitate stress resistance of probiotic in alginate-based microcapsules. Int J Biol Macromol 2023; 225:605-614. [PMID: 36410534 DOI: 10.1016/j.ijbiomac.2022.11.119] [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: 06/24/2022] [Revised: 11/01/2022] [Accepted: 11/12/2022] [Indexed: 11/19/2022]
Abstract
Alginate-based microcapsule has becoming a promising carrier for probiotic encapsulation due to the improved stress resistant ability. Besides the physical protection of microcapsules, bacterial quorum sensing (QS) is another prominent factor affecting microbial stress resistance in microcapsules. In the present study, Vibrio harveyi cells were entrapped and proliferated into cell aggregates in alginate-based microcapsules. The microenvironment composed of cells and biomacromolecules was regulated by the diameter, alginate concentration and core state of microcapsule. Then the effect of microenvironment on bacterial QS capacity was investigated, including bioluminescence, autoinducers (AIs) production and QS related genes expression. The highest diameter of 1200 μm and highest alginate concentration of 2.0 % w/v under the investigation range presented strongest QS capacity, and the maintenance of hydrogel core could enhance bacterial QS. Moreover, the mechanism analysis revealed that the formed biofilm on the surface of cell aggregates hampered the outward transfer of AIs, and the local AIs inside the cell aggregates induced stronger bacteria QS by close-range interaction. As a whole, these findings are helpful to guide the technological development and optimization of microencapsulated probiotics with stronger stress resistance, and the potential application in food, dairy, wastewater treatment and biosensor.
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Affiliation(s)
- Cheng Li
- The Affiliated Zhongshan Hospital of Dalian University, Dalian 116001, PR China
| | - Meng Gao
- Laboratory of Biomedical Materials Engineering, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
| | - Guoshuang Zheng
- The Affiliated Zhongshan Hospital of Dalian University, Dalian 116001, PR China
| | - Xiaojun Ma
- Laboratory of Biomedical Materials Engineering, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
| | - Xiudong Liu
- College of Environment and Chemical Engineering, Dalian University, Dalian Economic Technological Development Zone, Dalian 116622, PR China.
| | - Weiting Yu
- The Affiliated Zhongshan Hospital of Dalian University, Dalian 116001, PR China; Laboratory of Biomedical Materials Engineering, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China.
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4
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Microencapsulating polymers for probiotics delivery systems: Preparation, characterization, and applications. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2021.106882] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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5
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Meng Z, He Y, Wang F, Hang R, Zhang X, Huang X, Yao X. Enhancement of Antibacterial and Mechanical Properties of Photocurable ε-Poly-l-lysine Hydrogels by Tannic Acid Treatment. ACS APPLIED BIO MATERIALS 2021; 4:2713-2722. [PMID: 35014310 DOI: 10.1021/acsabm.0c01633] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
In this study, a photocurable hydrogel based on an ε-poly-l-lysine (EPL) composite was fabricated by a grafting reaction using glycidyl methacrylate and then complexed with tannic acid (TA) to improve the mechanical stability and antibacterial performance of the EPL hydrogels. UV-visible spectrophotometry, nuclear magnetic resonance, and Fourier transform infrared spectroscopy were introduced to characterize the chemical construction. The obtained EPLMA hydrogel was immersed into TA solution to induce the forming of the H-bond between EPL and TA, resulting in double networks in the composite hydrogel (EPLMA-TA). Due to the additional hydrogen-bond interaction between TA and EPLMA, the mechanical properties of hydrogels were improved and supported cell growth and proliferation. In addition, the antibacterial properties and antioxidant activities of the EPLMA-TA hydrogels were greatly enhanced due to the addition of TA. All the findings indicate that the EPLMA-TA hydrogels with multiple properties show great potential for biomedicine applications.
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Affiliation(s)
- Zhen Meng
- Laboratory of Biomaterial Surface and Interface, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, PR China
| | - Yongji He
- Institute of Functional Food of Shanxi, Shanxi Agricultural University, 79 Longcheng Street, Taiyuan 030031, Shanxi Province, PR China
| | - Fan Wang
- Laboratory of Biomaterial Surface and Interface, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, PR China
| | - Ruiqiang Hang
- Laboratory of Biomaterial Surface and Interface, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, PR China
| | - Xiangyu Zhang
- Laboratory of Biomaterial Surface and Interface, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, PR China
| | - Xiaobo Huang
- Laboratory of Biomaterial Surface and Interface, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, PR China
| | - Xiaohong Yao
- Laboratory of Biomaterial Surface and Interface, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, PR China
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6
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Zhang C, Wang C, Zhao S, Xiu Z. Role of c-di-GMP in improving stress resistance of alginate-chitosan microencapsulated Bacillus subtilis cells in simulated digestive fluids. Biotechnol Lett 2021; 43:677-690. [PMID: 33385252 DOI: 10.1007/s10529-020-03055-0] [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: 11/05/2020] [Accepted: 12/10/2020] [Indexed: 11/27/2022]
Abstract
OBJECTIVES Probiotics (Bacillus subtilis 04178) were entrapped in alginate-chitosan microcapsules by high-voltage electrostatic process. The encapsulation pattern was established as entrapped low density cells with culture (ELDCwc). The performance of ELDCwc cells was investigated against stress environments of simulated digestive fluids. RESULTS After incubation in simulated gastric (pH 2.5) and intestinal fluids (4% bile salt) for 2 h, the survival rate of ELDCwc cells (18.19% and 27.54%) was significantly higher than that of the free cells (0.0000009% and 0.0005%). The reason why B. subtilis embedded in microcapsules can resist the stress environments was that the mass production of extracellular proteins and polysaccharides prompted B. subtilis to form cell aggregates. The production of extracellular proteins and polysaccharides were regulated by the concentration of c-di-GMP and the expression of ydaJKLMN operon, abbA, sinI, slrA, slrB, abrR and sinR. CONCLUSIONS c-di-GMP is important for the production of extracellular polymer substance to enhance probiotic viability in stress environments.
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Affiliation(s)
- Chaolei Zhang
- School of Life Science and Biotechnology, Dalian University of Technology, Linggong Road 2, Dalian, 116024, China
| | - Chao Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, China
| | - Shan Zhao
- Dalian Institute of Chemical Physics, Chinese Academy of Science, 116023, Dalian, China
| | - Zhilong Xiu
- School of Life Science and Biotechnology, Dalian University of Technology, Linggong Road 2, Dalian, 116024, China.
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7
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Sustained release of TGF-β 3 from polysaccharide nanoparticles induces chondrogenic differentiation of human mesenchymal stromal cells. Colloids Surf B Biointerfaces 2020; 189:110843. [PMID: 32044676 DOI: 10.1016/j.colsurfb.2020.110843] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 01/30/2020] [Accepted: 02/01/2020] [Indexed: 11/24/2022]
Abstract
Medical treatment of certain diseases and biomedical implants are tending to use delivery systems on the nanoscale basis for biologically active factors including drugs (e. g. antibiotics) or growth factors. Nanoparticles are a useful tool to deliver bioactive substances of different chemical nature directly to the site where it is required in the patient. Here we developed three innovative delivery systems based on different polysaccharides in order to induce a sustained release of TGF-β3 to mediate chondrogenesis of human mesenchymal stromal cells. We were able to encapsulate the protein into nanoparticles and subsequently release TGF-β3 from these particles. The protein was still active and was able to induce chondrogenic differentiation of human mesenchymal stromal cells.
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8
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Liu H, Cui SW, Chen M, Li Y, Liang R, Xu F, Zhong F. Protective approaches and mechanisms of microencapsulation to the survival of probiotic bacteria during processing, storage and gastrointestinal digestion: A review. Crit Rev Food Sci Nutr 2019; 59:2863-2878. [PMID: 28933562 DOI: 10.1080/10408398.2017.1377684] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
In recent years, there is a rising interest in the number of food products containing probiotic bacteria with favorable health benefit effects. However, the viability of probiotic bacteria is always questionable when they exposure to the harsh environment during processing, storage, and gastrointestinal digestion. To overcome these problems, microencapsulation of cells is currently receiving considerable attention and has obtained valuable effects. According to the drying temperature, the commonly used technologies can be divided into two patterns: high temperature drying (spray drying and fluid bed drying) and low temperature drying (ultrasonic vacuum spray drying, spray chilling, electrospinning, supercritical technique, freeze drying, extrusion, emulsion, enzyme gelation, and impinging aerosol technique). Furthermore, not only should the probiotic bacteria maintain high viability during processing but they also need to keep alive during storage and gastrointestinal digestion, where they additionally suffer from water, oxygen, heat as well as strong acid and bile conditions. This review focuses on demonstrating the effects of different microencapsulation techniques on the survival of bacteria during processing as well as protective approaches and mechanisms to the encapsulated probiotic bacteria during storage and gastrointestinal digestion that currently reported in the literature.
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Affiliation(s)
- Huan Liu
- State Key Laboratory of Food Science and Technology, Jiangnan University , Wuxi , China.,School of Food Science and Technology, Jiangnan University , Wuxi , China
| | - Steve W Cui
- Guelph Food Research Centre, Agriculture and Agri-Food Canada , Guelph , Ontario , Canada
| | - Maoshen Chen
- State Key Laboratory of Food Science and Technology, Jiangnan University , Wuxi , China.,School of Food Science and Technology, Jiangnan University , Wuxi , China
| | - Yue Li
- State Key Laboratory of Food Science and Technology, Jiangnan University , Wuxi , China.,School of Food Science and Technology, Jiangnan University , Wuxi , China
| | - Rong Liang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University , Wuxi , China
| | - Feifei Xu
- State Key Laboratory of Food Science and Technology, Jiangnan University , Wuxi , China.,School of Food Science and Technology, Jiangnan University , Wuxi , China
| | - Fang Zhong
- State Key Laboratory of Food Science and Technology, Jiangnan University , Wuxi , China.,School of Food Science and Technology, Jiangnan University , Wuxi , China
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9
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Yuan J, Guo L, Wang S, Liu D, Qin X, Zheng L, Tian C, Han X, Chen R, Yin R. Preparation of self-assembled nanoparticles of ε-polylysine-sodium alginate: A sustained-release carrier for antigen delivery. Colloids Surf B Biointerfaces 2018; 171:406-412. [PMID: 30071482 DOI: 10.1016/j.colsurfb.2018.07.058] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 07/16/2018] [Accepted: 07/24/2018] [Indexed: 01/10/2023]
Abstract
Low immunogenicity prohibits the widespread use of subunit vaccine against infectious diseases and cancers. Hence, a new generation of adjuvants and delivery systems is indispensable for more potent antigen-specific immune responses. Predominantly, nanoparticles formulated from biodegradable polymers are being widely explored as carriers of novel vaccines owing to their outstanding natural properties. We fabricated a model antigen - bovine serum albumin (BSA) encapsulated ε-polylysine (ε-PL) - sodium alginate (SA) nanoparticles (PSNPs), which were self-assembled by ionotropic complexation method, a very simple and mild process, as a result of the electrostatic interaction between oppositely charged polyelectrolyte complexes (PEC). After the preparation, various in vitro parameters were characterized. Scanning electron microscope and dynamic light scattering were employed to study the morphology, size, zeta potential and optimize formulation. Forming mechanism of PSNPS was analyzed and verified by infrared absorption spectra and thermal analysis. Delivery behavior of PSNPs was assessed via release study, cytotoxicity measurement and cellular uptake. BSA-PSNPs with a mean particle diameter 133.2 ± 0.5 nm, narrow size distribution and negatively charged surface had been synthesized successfully by this method. The results of in vitro studies demonstrated that the nanosuspension was able to prevent burst release of loaded BSA and presented sustained-release behavior. It was no cytotoxicity by the bio-assessment using macrophage cells, and was observed significantly higher uptake compared with BSA free solution. Herein, ε-polylysine - sodium alginate nanoparticles had been found to be a potential candidate for vaccine delivery.
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Affiliation(s)
- Jing Yuan
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, PR China
| | - Lu Guo
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, PR China
| | - Sijia Wang
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, PR China
| | - Dan Liu
- Department of Pharmacy, The Fourth Affiliated Hospital of China Medical University, Shenyang, 110032, PR China
| | - Xia Qin
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, PR China
| | - Lili Zheng
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, PR China
| | - Chunlian Tian
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, PR China
| | - Xiaohu Han
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, PR China
| | - Ran Chen
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, PR China
| | - Ronghuan Yin
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, PR China.
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10
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Li DN, He YM, Feng JJ, Zhang QL, Zhang L, Wu L, Wang AJ. Facile synthesis of prickly platinum-palladium core-shell nanocrystals and their boosted electrocatalytic activity towards polyhydric alcohols oxidation and hydrogen evolution. J Colloid Interface Sci 2018; 516:476-483. [DOI: 10.1016/j.jcis.2018.01.060] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 01/15/2018] [Accepted: 01/15/2018] [Indexed: 01/15/2023]
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11
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Li DN, Wang AJ, Wei J, Zhang QL, Feng JJ. Dentritic platinum-palladium/palladium core-shell nanocrystals/reduced graphene oxide: One-pot synthesis and excellent electrocatalytic performances. J Colloid Interface Sci 2018; 514:93-101. [DOI: 10.1016/j.jcis.2017.11.077] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 11/28/2017] [Accepted: 11/28/2017] [Indexed: 01/09/2023]
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12
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Nanoparticulation of bovine serum albumin and poly-d-lysine through complex coacervation and encapsulation of curcumin. Colloids Surf B Biointerfaces 2017; 159:759-769. [DOI: 10.1016/j.colsurfb.2017.08.047] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2016] [Revised: 07/29/2017] [Accepted: 08/25/2017] [Indexed: 12/19/2022]
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13
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Gao M, Zheng H, Ren Y, Lou R, Wu F, Yu W, Liu X, Ma X. A crucial role for spatial distribution in bacterial quorum sensing. Sci Rep 2016; 6:34695. [PMID: 27698391 PMCID: PMC5048177 DOI: 10.1038/srep34695] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 09/19/2016] [Indexed: 01/19/2023] Open
Abstract
Quorum sensing (QS) is a process that enables bacteria to communicate using secreted signaling molecules, and then makes a population of bacteria to regulate gene expression collectively and control behavior on a community-wide scale. Theoretical studies of efficiency sensing have suggested that both mass-transfer performance in the local environment and the spatial distribution of cells are key factors affecting QS. Here, an experimental model based on hydrogel microcapsules with a three-dimensional structure was established to investigate the influence of the spatial distribution of cells on bacterial QS. Vibrio harveyi cells formed different spatial distributions in the microcapsules, i.e., they formed cell aggregates with different structures and sizes. The cell aggregates displayed stronger QS than did unaggregated cells even when equal numbers of cells were present. Large aggregates (LA) of cells, with a size of approximately 25 μm, restricted many more autoinducers (AIs) than did small aggregates (SA), with a size of approximately 10 μm, thus demonstrating that aggregate size significantly affects QS. These findings provide a powerful demonstration of the fact that the spatial distribution of cells plays a crucial role in bacterial QS.
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Affiliation(s)
- Meng Gao
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China.,University of the Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Huizhen Zheng
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China.,University of the Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Ying Ren
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China.,University of the Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Ruyun Lou
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China.,University of the Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Fan Wu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China.,University of the Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Weiting Yu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
| | - Xiudong Liu
- College of Environment and Chemical Engineering, Dalian University, Dalian Economic Technological Development Zone, Dalian 116622, P.R. China
| | - Xiaojun Ma
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
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14
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Zhang BB, Wang L, Charles V, Rooke JC, Su BL. Robust and Biocompatible Hybrid Matrix with Controllable Permeability for Microalgae Encapsulation. ACS APPLIED MATERIALS & INTERFACES 2016; 8:8939-8946. [PMID: 27027232 DOI: 10.1021/acsami.6b00191] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Hybrid beads with entrapped microalgae Chlamydomonas reinhardtii were synthesized for the sustainable production of high value metabolites via photosynthesis. Encapsulating the microalgae requires an exquisite control of material properties, which has been achieved by modifying the composition (alginate, polycation, and silica). A coating of PDADMAC precluded cell leakage as indicated by the OD750 value of the culture medium, and the homogeneous distribution of silica prevented bead shrinkage from the strong electronic force of PDADMAC, resulting in a robust and biocompatible matrix for the cells. Besides fabricating suitable porous beads for the diffusion of expected metabolites, the permeability can be controlled to a certain degree by applying different molecular weights of PDADMAC. The hybrid alginate+silica/CaCl2+PDADMAC beads possessed sufficient mechanical rigidity to sheer force under constant stirring and good chemical stability to chelating agents such as sodium citrate. Moreover, the encapsulated cells exhibited excellent long-term viability and cellular functionality, which retained about 81.5% of the original value after a 120 day encapsulation as observed by microscopy and oximetry measurement. This study is not only significant for understanding the critical role of polycations and silica involved in the synthesis of hybrid beads but also important for real-scale bioengineering applications.
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Affiliation(s)
- Bo-Bo Zhang
- Laboratory of Inorganic Materials Chemistry, University of Namur , rue de Bruxelles, 61, Namur B-5000, Belgium
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University , Wuxi 214122, P. R. China
| | - Li Wang
- Laboratory of Inorganic Materials Chemistry, University of Namur , rue de Bruxelles, 61, Namur B-5000, Belgium
- Laboratory of Living Materials, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Luoshi Road 122, Wuhan 430070, P. R. China
| | - Valérie Charles
- Laboratory of Inorganic Materials Chemistry, University of Namur , rue de Bruxelles, 61, Namur B-5000, Belgium
| | - Joanna C Rooke
- Laboratory of Inorganic Materials Chemistry, University of Namur , rue de Bruxelles, 61, Namur B-5000, Belgium
| | - Bao-Lian Su
- Laboratory of Inorganic Materials Chemistry, University of Namur , rue de Bruxelles, 61, Namur B-5000, Belgium
- Laboratory of Living Materials, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Luoshi Road 122, Wuhan 430070, P. R. China
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15
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Gao M, Song H, Liu X, Yu W, Ma X. Improved quorum sensing capacity by culturing Vibrio harveyi in microcapsules. J Biosci Bioeng 2015; 121:406-12. [PMID: 26364746 DOI: 10.1016/j.jbiosc.2015.08.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 07/18/2015] [Accepted: 08/17/2015] [Indexed: 01/08/2023]
Abstract
Microcapsule entrapped low density cells with culture (ELDCwc), different from free cell culture, conferred stronger stress resistance and improved cell viability of microorganisms. In this paper, the quorum sensing (QS) system of Vibrio harveyi was used to investigate changes when cells were cultured in microcapsules. Cells in ELDCwc group grew into cell aggregates, which facilitated cell-cell communication and led to increased bioluminescence intensity. Moreover, the luxS-AI-2 system, a well-studied QS signal pathway, was detected as both luxS gene and the AI-2 signaling molecule, and the results were analyzed with respect to QS capacity of unit cell. The V. harveyi of ELDCwc also showed higher relative gene expression and stronger quorum sensing capacity when compared with free cells. In conclusion, the confined microcapsule space can promote the cell aggregates formation, reduce cell-cell communication distance and increase local concentration of signal molecule, which are beneficial to bacterial QS.
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Affiliation(s)
- Meng Gao
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China
| | - Huiyi Song
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China
| | - Xiudong Liu
- College of Environment and Chemical Engineering, Dalian University, Dalian Economic Technological Development Zone, Dalian 116622, PR China
| | - Weiting Yu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China.
| | - Xiaojun Ma
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
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