期刊
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
卷 89, 期 5, 页码 1563-1571出版社
SPRINGER
DOI: 10.1007/s00253-010-2947-y
关键词
Extracellular polymeric substances; Salinity; Partial nitrification; Excitation-emission matrix
资金
- National Natural Science Foundation of China [50778156]
- Chinese Academy of Science [KZCXZ-YM-451]
In this study, the characteristics of extracellular polymeric substance (EPS) fractions of biofilm during the process of establishing a partial nitrification under salt stress were analyzed in terms of concentrations, molecular weight distribution, and three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy. A partial nitrification was formed successfully with a salinity of 1%. Results indicated that the amount of total EPS increased from 54.2 mg g(-1) VSS-1 on day 1 to 99.6 mg g(-1) VSS-1 on day 55 due to the NaCl concentration changed from 0 to 10.0 g L-1 in a biofilm reactor. The changes of loosely bound EPS (LB-EPS) compounds under different salt concentrations appeared to be more significant than those of the tightly bound EPS. A clear release of polysaccharides in the LB-EPS fraction was detected during the enhancement of salinity. This was considered as a protective response of bacteria to the salinity. Three fluorescence peaks were identified in the EEM fluorescence spectra of the EPS fraction samples. Two peaks were assigned to the protein-like fluorophores, and the third peak was located at the excitation/emission wavelengths of 275 nm/425-435 nm of the spectra of EPS fractions till the salinity maintained constant at 1%. This information is valuable for understanding the characteristics of EPS isolated from biomass in a saline nitrogen removal system.
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