Journal
CARBOHYDRATE POLYMERS
Volume 92, Issue 2, Pages 1408-1415Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.10.070
Keywords
Cyanobacteria; Cyanothece; Extracellular polymeric substances (EPS); Released polysaccharides (RPS)
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Funding
- FEDER funds through the Operational Competitiveness Programme - COMPETE
- National Funds through FCT - Fundacao para a Ciencia e a Tecnologia [FCOMP-01-0124-FEDER-022718 (PEst-C/SAU/LA0002/2011), FCOMP-01-0124-FEDER-009389 (PTDC/CTM/100627/2008), FCOMP-01-0124-FEDER-009697 (PTDC/EBB-EBI/099662/2008), SFRH/BPD/37045/2007, SFRH/BPD/72400/2010]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/72400/2010] Funding Source: FCT
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Cyanobacterial extracellular polymeric substances (EPS) are heteropolysaccharides that possess characteristics suitable for industrial applications, notably a high number of different monomers, strong anionic nature and high hydrophobicity. However, systematic studies that unveil the conditions influencing EPS synthesis and/or its characteristics are mandatory. In this work, Cyanothece sp. CCY 0110 was used as model organism. Our results revealed that this strain is among the most efficient EPS producers, and that the amount of RPS (released polysaccharides) is mainly related to the number of cells, rather than to the amount produced by each cell. Light was the key parameter, with high light intensity enhancing significantly RPS production (reaching 1.8 g L-1), especially in the presence of combined nitrogen. The data showed that RPS are composed by nine different monosaccharides (including two uronic acids), the presence of sulfate groups and peptides, and that the polymer is remarkably thermostable and amorphous in nature. (C) 2012 Elsevier Ltd. All rights reserved.
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