Ecological significance and industrial application of extracellular polysaccharides from cyanobacteria: A review.
生态学杂志
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cje  2013, Vol. 32 Issue (3): 762-771    DOI:
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Ecological significance and industrial application of extracellular polysaccharides from cyanobacteria: A review.
REN Xin-xin1, JIANG Hao1,2, LENG Xin1, AN Shu-qing1**
(1School of Life Sciences, Nanjing University, Nanjing 210093, China; 2HydroChina Huadong Engineering Corporation, Hanzhou 310014, China)
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Abstract 
Cyanobacteria can produce extracellular polysaccharides (EPS) and release them to the environment, which is one of the adaptive mechanisms of cyanobacteria evolved to face complicated and variable environment. As a protective barrier between cell and environment, the EPS play a protective role against desiccation, ultraviolet radiation, biomineralization, or predation by protozoans. The EPS produced by cyanobacteria are a kind of complex anionic heteropolymer polysaccharides, more than 75% of which are composed of six or more monosaccharaides. Glucose is the most frequent kind of monosaccharaides. The characteristics of the EPS vary with cyanobacterial species. Most of the EPS show an anionic feature due to the charged groups, such as uronic acid and sulfate groups. Sulfate group is the basis of the anti-viral properties of polysaccharides, while hydrophobic groups such as ester-linked acetyl groups, peptides moieties, and deoxy sugars contribute to emulsifying properties. Therefore, the EPS produced by cyanobacteria have a broad application prospect in many industries, such as food additives, cosmetology, pharmacology, and wastewater treatment. The industrial application of the EPS can not only reuse the cyanobacteria bloom, bringing considerable economic benefits, but also provide a solution to the salvaging cyanobacteria distribution problem, avoiding its secondary pollution. Until now, there is no commodity from cyanobacterial EPS, and many technical problems are needed to be solved between the theoretical study and large batch industrial production.
 
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REN Xin-xin1
JIANG Hao1
2
LENG Xin1
AN Shu-qing1**
Key wordsextracellular polysaccharides   water-soluble polysaccharides   ecological significance.     
Cite this article:   
REN Xin-xin1,JIANG Hao1,2 et al. Ecological significance and industrial application of extracellular polysaccharides from cyanobacteria: A review.[J]. cje, 2013, 32(3): 762-771.
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http://www.cje.net.cn/EN/     or     http://www.cje.net.cn/EN/Y2013/V32/I3/762
 
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