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Yan B, Chen T, Tao Y, Zhang N, Zhao J, Zhang H, Chen W, Fan D. Fabrication, Functional Properties, and Potential Applications of Mixed Gellan-Polysaccharide Systems: A Review. Annu Rev Food Sci Technol 2024; 15:151-172. [PMID: 37906941 DOI: 10.1146/annurev-food-072023-034318] [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] [Indexed: 11/02/2023]
Abstract
Gellan, an anionic heteropolysaccharide synthesized by Sphingomonas elodea, is an excellent gelling agent. However, its poor mechanical strength and high gelling temperature limit its application. Recent studies have reported that combining gellan with other polysaccharides achieves desirable properties for food- and biomaterial-related applications. This review summarizes the fabrication methods, functional properties, and potential applications of gellan-polysaccharide systems. Starch, pectin, xanthan gum, and konjac glucomannan are the most widely used polysaccharides in these composite systems. Heating-cooling and ionic-induced cross-linking approaches have been used in the fabrication of these systems. Composite gels fabricated using gellan and various polysaccharides exhibit different functional properties, possibly because of their distinct molecular interactions. In terms of applications, mixed gellan-polysaccharide systems have been extensively used in texture modification, edible coatings and films, bioactive component delivery, and tissue-engineering applications. Further scientific studies, including structural determinations of mixed systems, optimization of processing methods, and expansion of applications in food-related fields, are needed.
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Affiliation(s)
- Bowen Yan
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China;
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Tiantian Chen
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China;
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Yuan Tao
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China;
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Nana Zhang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China;
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Jianxin Zhao
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China;
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Hao Zhang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China;
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Wei Chen
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China;
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Daming Fan
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu, China;
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
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Schultz J, Modolon F, Peixoto RS, Rosado AS. Shedding light on the composition of extreme microbial dark matter: alternative approaches for culturing extremophiles. Front Microbiol 2023; 14:1167718. [PMID: 37333658 PMCID: PMC10272570 DOI: 10.3389/fmicb.2023.1167718] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Accepted: 05/09/2023] [Indexed: 06/20/2023] Open
Abstract
More than 20,000 species of prokaryotes (less than 1% of the estimated number of Earth's microbial species) have been described thus far. However, the vast majority of microbes that inhabit extreme environments remain uncultured and this group is termed "microbial dark matter." Little is known regarding the ecological functions and biotechnological potential of these underexplored extremophiles, thus representing a vast untapped and uncharacterized biological resource. Advances in microbial cultivation approaches are key for a detailed and comprehensive characterization of the roles of these microbes in shaping the environment and, ultimately, for their biotechnological exploitation, such as for extremophile-derived bioproducts (extremozymes, secondary metabolites, CRISPR Cas systems, and pigments, among others), astrobiology, and space exploration. Additional efforts to enhance culturable diversity are required due to the challenges imposed by extreme culturing and plating conditions. In this review, we summarize methods and technologies used to recover the microbial diversity of extreme environments, while discussing the advantages and disadvantages associated with each of these approaches. Additionally, this review describes alternative culturing strategies to retrieve novel taxa with their unknown genes, metabolisms, and ecological roles, with the ultimate goal of increasing the yields of more efficient bio-based products. This review thus summarizes the strategies used to unveil the hidden diversity of the microbiome of extreme environments and discusses the directions for future studies of microbial dark matter and its potential applications in biotechnology and astrobiology.
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Affiliation(s)
- Júnia Schultz
- Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
- Computational Bioscience Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Flúvio Modolon
- Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
- Laboratory of Molecular Microbial Ecology, Institute of Microbiology, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Raquel Silva Peixoto
- Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
- Computational Bioscience Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Alexandre Soares Rosado
- Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
- Computational Bioscience Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
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Schultz J, Modolon F, Rosado AS, Voolstra CR, Sweet M, Peixoto RS. Methods and Strategies to Uncover Coral-Associated Microbial Dark Matter. mSystems 2022; 7:e0036722. [PMID: 35862824 PMCID: PMC9426423 DOI: 10.1128/msystems.00367-22] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The vast majority of environmental microbes have not yet been cultured, and most of the knowledge on coral-associated microbes (CAMs) has been generated from amplicon sequencing and metagenomes. However, exploring cultured CAMs is key for a detailed and comprehensive characterization of the roles of these microbes in shaping coral health and, ultimately, for their biotechnological use as, for example, coral probiotics and other natural products. Here, the strategies and technologies that have been used to access cultured CAMs are presented, while advantages and disadvantages associated with each of these strategies are discussed. We highlight the existing gaps and potential improvements in culture-dependent methodologies, indicating several possible alternatives (including culturomics and in situ diffusion devices) that could be applied to retrieve the CAM "dark matter" (i.e., the currently undescribed CAMs). This study provides the most comprehensive synthesis of the methodologies used to recover the cultured coral microbiome to date and draws suggestions for the development of the next generation of CAM culturomics.
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Affiliation(s)
- Júnia Schultz
- Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Flúvio Modolon
- Laboratory of Molecular Microbial Ecology, Institute of Microbiology, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Alexandre S. Rosado
- Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | | | - Michael Sweet
- Aquatic Research Facility, Environmental Sustainability Research Centre, University of Derby, Derby, UK
| | - Raquel S. Peixoto
- Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
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Maniyam MN, Ibrahim AL, Cass AEG. Enhanced cyanide biodegradation by immobilized crude extract of Rhodococcus UKMP-5M. ENVIRONMENTAL TECHNOLOGY 2019; 40:386-398. [PMID: 29032742 DOI: 10.1080/09593330.2017.1393015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 09/29/2017] [Indexed: 06/07/2023]
Abstract
The capability of the crude extract of Rhodococcus UKMP-5M was enhanced by adopting the technology of immobilization. Among the matrices screened to encapsulate the crude extract, gellan gum emerged as the most suitable immobilization material, exceeding the activity of cyanide-degrading enzyme by 61% and 361% in comparison to alginate carrier and non-immobilized crude extract, respectively. Improved bead mechanical strength which supported higher biocatalyst activity by 63% was observed when concentration of gellan gum, concentration of calcium chloride, number of beads and bead size were optimized. The immobilized crude extract demonstrated higher tolerance towards broad range of pH (5-10) and temperature (30°C-40°C), superior cyanide-degrading activity over time and improved storage stability by maintaining 76% of its initial activity after 30 days at 4°C. Furthermore, repeated use of the gellan gum beads up to 20 batches without substantial loss in the catalytic activity was documented in the present study, indicating that the durability of the beads and the stability of the enzyme are both above adequate. Collectively, the findings reported here revealed that the utilization of the encapsulated crude extract of Rhodococcus UKMP-5M can be considered as a novel attempt to develop an environmentally favourable and financially viable method in cyanide biodegradation.
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Affiliation(s)
| | - Abdul Latif Ibrahim
- a Institute of Bio-IT Selangor, Universiti Selangor , Shah Alam , Selangor , Malaysia
| | - Anthony E G Cass
- b Department of Chemistry , Imperial College London, South Kensington Campus , London , UK
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Vigués N, Pujol-Vila F, Marquez-Maqueda A, Muñoz-Berbel X, Mas J. Electro-addressable conductive alginate hydrogel for bacterial trapping and general toxicity determination. Anal Chim Acta 2018; 1036:115-120. [DOI: 10.1016/j.aca.2018.06.062] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 05/15/2018] [Accepted: 06/22/2018] [Indexed: 01/01/2023]
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Landreau M, Duthoit F, Roussel E, Schönherr S, Georges M, Godfroy A, Le Blay G. Cultivation of an immobilized (hyper)thermophilic marine microbial community in a bioreactor. FEMS Microbiol Lett 2016; 363:fnw194. [PMID: 27528693 DOI: 10.1093/femsle/fnw194] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2016] [Indexed: 01/23/2023] Open
Abstract
Cultivation in a bioreactor of immobilized deep-sea hydrothermal microbial community was tested in order to assess the stability and reactivity of this new system. A community composed of eight hydrothermal strains was entrapped in a polymer matrix that was used to inoculate a continuous culture in a gas-lift bioreactor. The continuous culture was performed for 41 days at successively 60°C, 55°C, 60°C, 85°C and 60°C, at pH 6.5, in anaerobic condition and constant dilution rate. Oxic stress and pH variations were tested at the beginning of the incubation. Despite these detrimental conditions, three strains including two strict anaerobes were maintained in the bioreactor. High cell concentrations (3 × 10(8) cells mL(-1)) and high ATP contents were measured in both liquid fractions and beads. Cloning-sequencing and qPCR revealed that Bacillus sp. dominated at the early stage, and was later replaced by Thermotoga maritima and Thermococcus sp. Acetate, formate and propionate concentrations varied simultaneously in the liquid fractions. These results demonstrate that these immobilized cells were reactive to culture conditions. They were protected inside the beads during the stress period and released in the liquid fraction when conditions were more favorable. This confirms the advantage of immobilization that highlights the resilience capacity of certain hydrothermal microorganisms after a stress period.
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Affiliation(s)
- M Landreau
- Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Université de Bretagne Occidentale (UBO, UEB), Institut Universitaire Européen de la Mer (IUEM)-UMR 6197, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France CNRS, IUEM-UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Place Nicolas Copernic, F-29280 Plouzané, France Ifremer, UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Technopôle Pointe du diable, F-29280 Plouzané, France
| | - F Duthoit
- Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Université de Bretagne Occidentale (UBO, UEB), Institut Universitaire Européen de la Mer (IUEM)-UMR 6197, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France CNRS, IUEM-UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Place Nicolas Copernic, F-29280 Plouzané, France Ifremer, UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Technopôle Pointe du diable, F-29280 Plouzané, France
| | - E Roussel
- Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Université de Bretagne Occidentale (UBO, UEB), Institut Universitaire Européen de la Mer (IUEM)-UMR 6197, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France CNRS, IUEM-UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Place Nicolas Copernic, F-29280 Plouzané, France Ifremer, UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Technopôle Pointe du diable, F-29280 Plouzané, France
| | - S Schönherr
- Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Université de Bretagne Occidentale (UBO, UEB), Institut Universitaire Européen de la Mer (IUEM)-UMR 6197, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France CNRS, IUEM-UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Place Nicolas Copernic, F-29280 Plouzané, France Ifremer, UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Technopôle Pointe du diable, F-29280 Plouzané, France
| | - Myriam Georges
- Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Université de Bretagne Occidentale (UBO, UEB), Institut Universitaire Européen de la Mer (IUEM)-UMR 6197, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France CNRS, IUEM-UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Place Nicolas Copernic, F-29280 Plouzané, France Ifremer, UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Technopôle Pointe du diable, F-29280 Plouzané, France
| | - A Godfroy
- Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Université de Bretagne Occidentale (UBO, UEB), Institut Universitaire Européen de la Mer (IUEM)-UMR 6197, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France CNRS, IUEM-UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Place Nicolas Copernic, F-29280 Plouzané, France Ifremer, UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Technopôle Pointe du diable, F-29280 Plouzané, France
| | - G Le Blay
- Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Université de Bretagne Occidentale (UBO, UEB), Institut Universitaire Européen de la Mer (IUEM)-UMR 6197, Technopôle Brest-Iroise, Place Nicolas Copernic, F-29280 Plouzané, France CNRS, IUEM-UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Place Nicolas Copernic, F-29280 Plouzané, France Ifremer, UMR 6197, Laboratoire de Microbiologie des Environnements Extrêmes (LMEE), Technopôle Pointe du diable, F-29280 Plouzané, France
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