NOTE] Effects of Light Intensity on Components and Topographical Structures of Extracellular Polysaccharides from the Cyanobacteria Nostoc sp.

Hongmei Ge; Ling Xia; Xuping Zhou; Delu Zhang; Chunxiang Hu

doi:10.1007/s12275-014-2720-5

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Research Support, Non-U.S. Gov't
NOTE] Effects of Light Intensity on Components and Topographical Structures of Extracellular Polysaccharides from the Cyanobacteria Nostoc sp.: Hongmei Ge ^1,2, Ling Xia ^1,2, Xuping Zhou ^1,2, Delu Zhang ³, Chunxiang Hu ¹; Journal of Microbiology 2014;52(2):179-183
DOI: https://doi.org/10.1007/s12275-014-2720-5
Published online: February 1, 2014

¹Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, P. R. China, ²Graduate University of Chinese Academy of Sciences, Beijing, 100049, P. R. China, ³Department of Biological Science and Biotechnology, Wuhan University of Technology, Wuhan, 430070, P. R. China¹Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, P. R. China, ²Graduate University of Chinese Academy of Sciences, Beijing, 100049, P. R. China, ³Department of Biological Science and Biotechnology, Wuhan University of Technology, Wuhan, 430070, P. R. China

Corresponding author: Chunxiang Hu , Tel: +86-27-68780866,

Received: 31 December 2012 • Revised: 8 May 2013 • Accepted: 30 July 2013

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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.

Keywords: cyanobacteria; extracellular polysaccharides; light
intensity; Nostoc sp.; atomic force microscopy

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NOTE] Effects of Light Intensity on Components and Topographical Structures of Extracellular Polysaccharides from the Cyanobacteria Nostoc sp.

J. Microbiol. 2014;52(2):179-183. Published online February 1, 2014

DOI: https://doi.org/10.1007/s12275-014-2720-5

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