Extracellular biopolymers produced by freshwater cyanobacteria: a screening study

Uhliariková, Iveta; Chválová, Beata; Matulovà, Maria; Cepák, Vladislav; Lukavský, Jaromír; Capek, Peter

doi:10.1007/s11696-018-0625-1

Cited by 12 publications

(4 citation statements)

References 28 publications

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“…Regarding the nutritional composition of dehydrated nostoc ( Table 3 ), it was observed that the majority content is referred to carbohydrates that range between 57.30 to 64.38% ( p -value < 0.05), mainly composed of polysaccharides (gums and hydrocolloids) [ 22 , 35 ], making these raw materials potential sources for the production of suspension stabilizers [ 2 , 4 , 36 , 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

“…Total fat content is reported close to 1.7%, soluble fiber is around 9.0%, while the proteins in the ecotypes are around 24% ( p -value < 0.05). Algae from lagoon and spring waters are sources of high protein content [ 8 , 15 , 16 , 17 , 36 , 39 ], in addition to being easily digestible [ 40 ], which is why the inhabitants of the high Andean areas of the Andes in South America incorporate it into their diet [ 15 ], and in many cases, they substitute sources of protein from animal origin, due to the lack of dairy and meat derivatives.…”

Section: Resultsmentioning

confidence: 99%

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Preliminary Characterization of a Spray-Dried Hydrocolloid from a High Andean Algae (Nostoc sphaericum)

Choque-Quispe

Mojo-Quisani

Ligarda-Samanez

et al. 2022

Foods

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The search for new natural sources of hydrocolloids with stabilizing, thickening, and good binding capacity, from raw materials that are environmentally friendly and that contribute to the circular economy is a challenge for the food industry. The aim of the study was the preliminary characterization of a spray-dried hydrocolloid from high Andean algae Nostoc sphaericum. Four ecotypes of algae from Peruvian high Andean lagoons located above 4000 m were considered. The samples were collected in the period March—April 2021 and were subjected to a spray drying process in an aqueous medium. The characterization showed that the dehydrated nostoc ecotypes presented high protein and carbohydrate content, making it a potential material for direct use as a functional food for humans. The spray-dried product presented good stability for its use as a hydrocolloid, with zeta potential values (ζ), around 30 mV, evidencing the presence of -CO-, -OH, -COO-, and -CH groups, characteristic of polysaccharides, representing 40% of total organic carbon on average, giving it low water activity values and particle size at the nanometric level. Major minerals such as Ca (>277 mg/100 g), Mg (>19.7 mg/100 g), and Fe (>7.7 mg/100 g) were reported. Spray-dried nostoc is a hydrocolloid material with high potential for the food industry, with good nutritional content and techno-functional behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Preliminary Characterization of a Spray-Dried Hydrocolloid from a High Andean Algae (Nostoc sphaericum)

Choque-Quispe

Mojo-Quisani

Ligarda-Samanez

et al. 2022

Foods

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“…Cyanobacteria secrete a complex assortment of extracellular polysaccharides that may include cellulose 51 but this assortment can vary even within a species 52 . This variation, which has been shown experimentally to contribute to defense against viruses 53 and fungi 54 , could have presented a barrier to digestion of cyanobacteria by early fungi.…”

Section: [H1] Introductionmentioning

confidence: 99%

Genomic and fossil windows into the secret lives of the most ancient fungi

et al. 2020

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Fungi have crucial roles in modern ecosystems as decomposers and pathogens, and they engage in a variety of mutualistic associations with other organisms, especially plants. They have a lengthy geological history, and there is an emerging understanding of their impact on the evolution of Earth systems on a large scale. In this Review, we focus on the roles of fungi in the establishment and early evolution of land and freshwater ecosystems. Today, questions of evolution over deep time are informed by discoveries of new fossils and evolutionary analysis of new genomes. Inferences can be drawn from evolutionary analysis by comparing the genes and genomes of fungi with the biochemistry and development of their plant and algal hosts. We then contrast this emerging picture against evidence from the fossil record to develop a new, integrated perspective on the origin and early evolution of fungi.

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“…This formulation is expected to be cost competitive in comparison to more complete versions of cyanobacterial growth media. The RPS productivities under Portuguese climate were considerably higher when compared to those obtained from representants of Nostocales, Chroococcales, Synechococcales, Oscillatoriales, Spirulinares Pleurocapsales orders which were mostly grown under stable light and temperature conditions 27 , 29 , 32 , 34 , 35 , 37 , 63 . Both obtained RPS are glucan-based, in accordance with EPS composition described for cyanobacteria 64 .…”

Section: Discussionmentioning

confidence: 73%

Bioprospecting for industrially relevant exopolysaccharide-producing cyanobacteria under Portuguese simulated climate

Cruz,

Delattre,

Felpeto

et al. 2023

Sci Rep

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Cyanobacterial exopolysaccharides (EPS) are potential candidates for the production of sustainable biopolymers. Although the bioactive and physicochemical properties of cyanobacterial-based EPS are attractive, their commercial exploitation is limited by the high production costs. Bioprospecting and characterizing novel EPS-producing strains for industrially relevant conditions is key to facilitate their implementation in various biotechnological applications and fields. In the present work, we selected twenty-five Portuguese cyanobacterial strains from a diverse taxonomic range (including some genera studied for the first time) to be grown in diel light and temperature, simulating the Portuguese climate conditions, and evaluated their growth performance and proximal composition of macronutrients. Synechocystis and Cyanobium genera, from marine and freshwater origin, were highlighted as fast-growing (0.1–0.2 g L−1 day−1) with distinct biomass composition. Synechocystis sp. LEGE 07367 and Chroococcales cyanobacterium LEGE 19970, showed a production of 0.3 and 0.4 g L−1 of released polysaccharides (RPS). These were found to be glucan-based polymers with high molecular weight and a low number of monosaccharides than usually reported for cyanobacterial EPS. In addition, the absence of known cyanotoxins in these two RPS producers was also confirmed. This work provides the initial steps for the development of cyanobacterial EPS bioprocesses under the Portuguese climate.

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Extracellular biopolymers produced by freshwater cyanobacteria: a screening study

Cited by 12 publications

References 28 publications

Preliminary Characterization of a Spray-Dried Hydrocolloid from a High Andean Algae (Nostoc sphaericum)

Preliminary Characterization of a Spray-Dried Hydrocolloid from a High Andean Algae (Nostoc sphaericum)

Genomic and fossil windows into the secret lives of the most ancient fungi

Bioprospecting for industrially relevant exopolysaccharide-producing cyanobacteria under Portuguese simulated climate

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