光谱学与光谱分析 |
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FTIR Spectrum and Detoxication of Extracellular Polymeric Substances Secreted by Microorganism |
ZHANG Hai-ou1, ZHOU Wei-zhi1, 2*, MA Yu-hong1, ZHAO Hai-xia1, ZHANG Yu-zhong2 |
1. School of Environmental Science and Engineering, Shandong University, Ji’nan 250100, China 2. State Key Lab of Microbial Technology, Shandong University, Ji’nan 250100, China |
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Abstract In order to explore the effect of extracelluar polymeric substances (EPS) on resistance and removal of heavy metals, the production of EPS, secreted by cadmium-resistant strain (SCSE425-7) and cadmium-removal strain (SCSE709-6) was investigated combined with Fourier transform infrared spectroscopy (FTIR). The results showed that the high resistance to cadmium of strain SCSE425-7 was related to the high production of soluble EPS, whereas SCSE709-6 secreted more insoluble EPS resulting in better cadmium removal performance. It was indicated that soluble extracellular carbohydrates may help the bacteria to enhance resistance to Cd2+, and insoluble EPS could contribute to Cd2+ removal effectively. The FTIR spectra showed that the peaks of amide and carboxyl were main functional groups for Cd2+ adsorption.
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Received: 2013-01-30
Accepted: 2013-04-10
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Corresponding Authors:
ZHOU Wei-zhi
E-mail: wzzhou@sdu.edu.cn
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