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Effects of light intensity on components and topographical structures of extracellular polysaccharides from the cyanobacteria Nostoc sp. |
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| Authors: | Hongmei Ge Ling Xia Xuping Zhou Delu Zhang Chunxiang Hu |
| Institution: | 1. Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, P. R. China 2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, P. R. China 3. Department of Biological Science and Biotechnology, Wuhan University of Technology, Wuhan, 430070, P. R. China |
| Abstract: | A study on the effects of light intensity (40 and 80 μE/m2/sec) on the components and topographical structures of extracellular polysaccharides (EPS) was carried out in cyanobacteria Nostoc sp.. EPS yield increased with light intensity. However, light intensity did not significantly affect the EPS fractions and monosaccharide composition. Higher light intensity generally resulted in higher protein content of EPS in similar fractions. The topographical structure of EPS, investigated by atomic force microscopy, appeared as spherical lumps, chains and networks. The long chains were observed at higher light intensity. Thus, light intensity affected the yield and nature of EPS. |
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