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Biosorption of Cu(II) to extracellular polymeric substances (EPS) from Synechoeystis sp.: a fluorescence quenching study
Pan Xiangliang;  Liu Jing;  Song Wenjuan;  Zhang Daoyong
2012
Source PublicationFrontiers of Environmental Science and Engineering in China
Volume6Issue:4Pages:493-497
Abstract

Biosorption of extracellular polymeric substances (EPS) from Synechocystis sp. (cyanobacterium) with Cu(II) was investigated using fluorescence spectroscopy. Three fluorescence peaks were found in the excitation-emission matrix (EEM) fluorescence spectra of EPS. Fluorescence of peak A (Ex/Em = 275/452 nm) and peak C (Ex/Em = 350/452 nm) were originated from humic-like substances and fluorescence of peak B (Ex/ Em = 275/338 nm) was attributed to protein-like substances. Fluorescence of peaks A, B, and C could be quenched by Cu(II). The effective quenching constants (lg Ka) were 2.8–5.84 for peak A, 6.4–9.24 for peak B, and 3.48–6.68 for peak C, respectively. The values of lg Ka showed a decreasing trend with increasing temperature, indicating that the quenching processes were static in nature. The binding constants (lg Kb) followed the order of peak A > peak B > peak C, implying that the humic-like substances in EPS have greater Cu(II) binding capacity than the protein-like substances. The binding site number, n, in EPS-Cu(II) complexes for peaks A, B, and C was less than 1. This suggests the negative cooperativity between multiple binding sites and the presence of more than one Cu binding site.

KeywordBiosorption conditional Binding Constant extracellular Polymeric Substances (Eps) fluorescence Quenching
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10975
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Recommended Citation
GB/T 7714
Pan Xiangliang;Liu Jing;Song Wenjuan;Zhang Daoyong. Biosorption of Cu(II) to extracellular polymeric substances (EPS) from Synechoeystis sp.: a fluorescence quenching study[J]. Frontiers of Environmental Science and Engineering in China,2012,6(4):493-497.
APA Pan Xiangliang;Liu Jing;Song Wenjuan;Zhang Daoyong.(2012).Biosorption of Cu(II) to extracellular polymeric substances (EPS) from Synechoeystis sp.: a fluorescence quenching study.Frontiers of Environmental Science and Engineering in China,6(4),493-497.
MLA Pan Xiangliang;Liu Jing;Song Wenjuan;Zhang Daoyong."Biosorption of Cu(II) to extracellular polymeric substances (EPS) from Synechoeystis sp.: a fluorescence quenching study".Frontiers of Environmental Science and Engineering in China 6.4(2012):493-497.
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