Preparation and Characterization of Polysaccharide Films from the Cyanobacteria Nostoc commune

Rodríguez, Sol; Torres, Fernando G.; López, Daniel

doi:10.1177/204124791700800401

Cited by 18 publications

(34 citation statements)

References 46 publications

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“…Finally, the last class of extracellular polysaccharides is that of capsular polysaccharide needing stronger conditions for their extraction. Often considered as EPS in literature, their extraction implies the use of alkaline treatments of biomass such as a reflux in NaOH 0.1 M for 5 h at 90 • C [111]. The polysaccharides are precipitated using two volumes of isopropanol and dissolved in Milli-Q water.…”

Section: Downstream Processes and Cyano-eps Global Marketmentioning

confidence: 99%

Exopolysaccharides from Cyanobacteria: Strategies for Bioprocess Development

et al. 2020

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Cyanobacteria have the potential to become an industrially sustainable source of functional biopolymers. Their exopolysaccharides (EPS) harbor chemical complexity, which predicts bioactive potential. Although some are reported to excrete conspicuous amounts of polysaccharides, others are still to be discovered. The production of this strain-specific trait can promote carbon neutrality while its intrinsic location can potentially reduce downstream processing costs. To develop an EPS cyanobacterial bioprocess (Cyano-EPS) three steps were explored: the selection of the cyanobacterial host; optimization of production parameters; downstream processing. Studying the production parameters allow us to understand and optimize their response in terms of growth and EPS production though many times it was found divergent. Although the extraction of EPS can be achieved with a certain degree of simplicity, the purification and isolation steps demand experience. In this review, we gathered relevant research on EPS with a focus on bioprocess development. Challenges and strategies to overcome possible drawbacks are highlighted.

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Section: Downstream Processes and Cyano-eps Global Marketmentioning

confidence: 99%

Exopolysaccharides from Cyanobacteria: Strategies for Bioprocess Development

et al. 2020

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“…Bioactivity‐directed fractionation of a hot H 2 O extract from the cyanobacterium led to the isolation of a novel sulfated polysaccharide named spirulan as an antiviral principle. This polysaccharide was composed of rhamnose, ribose, mannose, fructose, galactose, xylose, glucose, uronic acid, glucuronic acid, galacturonic acid, sulfate, and calcium . The gels from Nostoc commune shows characteristicsof both chemical and physical gels .…”

Section: Extraction and Properties Of Cyanobacterial Polysaccharidesmentioning

confidence: 99%

Development of Functional Bionanocomposites Using Cyanobacterial Polysaccharides

Okajima

Sornkamnerd

Kaneko

2018

The Chemical Record

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Cyanobacteria are regarded as very eco-friendly microreactors for the production of various biomolecules such as polysaccharides by fixing not only carbon but also nitrogen in water. Cyanobacterial polysaccharides having various functional groups such as hydroxyls, carboxyls, sulfates, etc. have the ability to interact with metals or inorganics, to create bionanocomposites. Sacran, a supergiant cyanobacterial anionic polysaccharide extracted from the extracellular matrix of Aphanothece sacrum which is mass-cultivated in freshwater, is mainly used to create functional bionanocomposites. Gel-type bionanocomposites of sacran with various metal cations are formed and showed photoresponsive functions. Metal recovery is performed from the sacran bionanocomposite gels. Sacran chains are complexed with multi-wall carbon nanotubes (MWCNT) to give viscose dispersion from which MWCNT bionanocomposites can be collected by electrophoresis. The MWCNT/sacran dispersion retains the capability of adsorbing various metal ions to form hardened hydrogel beads. Finally, natural inorganic sepiolite can be used for sacran bionanocomposites which show an efficient neodymium ion adsorption ability. Thus, cyanobacterial polysaccharides are useful for preparing eco-friendly and functional bionanocomposites with various hard materials.

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“…These gels were stable over time and resistant to dehydration and spontaneous hydrolysis, being successfully used as matrices for the active form of the enzyme thiosulfate:cyanide sulfur transferase, as well as for 3D culture system of human mesenchymal stem cells (hMSCs). In another study, the RPS produced by Nostoc commune were combined with glycerol to prepare biopolymeric films suitable for the development of new materials, including coatings and membranes [38]. Importantly, the simple and effective methodology developed allows control of the films’ thickness and mechanical properties, thus expanding the repertoire of applications in the food and biomedical industries.…”

Section: Development and Possible Applications Of Cyanobacterial Ementioning

confidence: 99%

“…In the last years, significant advances were made on the characterization of cyanobacterial EPS [13,14,15,16] and the validation of their biotechnological and biomedical potential as metal chelators [15,17,18,19,20,21], flocculating, emulsifying or rheology modifiers [22,23,24,25] and/or agents with valuable biological activities (e.g., antiviral, antimicrobial, anticoagulant, antitumor) [26,27,28,29,30,31,32,33,34]. However, the development of biomaterials based on these polymers has only recently started to be explored [35,36,37,38,39]. In this context, the repertoire of cyanobacterial EPS-based biomaterials can be significantly expanded through the development of strategies to obtain designer biopolymers with specialized features, by either metabolic engineering and/or chemical functionalization.…”

Section: Introductionmentioning

confidence: 99%

Strategies to Obtain Designer Polymers Based on Cyanobacterial Extracellular Polymeric Substances (EPS)

Pereira

Sousa

Santos

et al. 2019

IJMS

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Biopolymers derived from polysaccharides are a sustainable and environmentally friendly alternative to the synthetic counterparts available in the market. Due to their distinctive properties, the cyanobacterial extracellular polymeric substances (EPS), mainly composed of heteropolysaccharides, emerge as a valid alternative to address several biotechnological and biomedical challenges. Nevertheless, biotechnological/biomedical applications based on cyanobacterial EPS have only recently started to emerge. For the successful exploitation of cyanobacterial EPS, it is important to strategically design the polymers, either by genetic engineering of the producing strains or by chemical modification of the polymers. This requires a better understanding of the EPS biosynthetic pathways and their relationship with central metabolism, as well as to exploit the available polymer functionalization chemistries. Considering all this, we provide an overview of the characteristics and biological activities of cyanobacterial EPS, discuss the challenges and opportunities to improve the amount and/or characteristics of the polymers, and report the most relevant advances on the use of cyanobacterial EPS as scaffolds, coatings, and vehicles for drug delivery.

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Preparation and Characterization of Polysaccharide Films from the Cyanobacteria Nostoc commune

Cited by 18 publications

References 46 publications

Exopolysaccharides from Cyanobacteria: Strategies for Bioprocess Development

Exopolysaccharides from Cyanobacteria: Strategies for Bioprocess Development

Development of Functional Bionanocomposites Using Cyanobacterial Polysaccharides

Strategies to Obtain Designer Polymers Based on Cyanobacterial Extracellular Polymeric Substances (EPS)

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