期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 24, 期 1, 页码 226-235出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-016-7387-5
关键词
Nanoparticle; Microcystis aeruginosa; Extracellular polymeric substances; Physicochemical characteristics; Behavior; Stability
资金
- National Science Funds for Creative Research Groups of China [51421006]
- Outstanding Youth Fund of Natural Science Foundation of Jiangsu, China [BK20160038]
- National Science Funds for Distinguished Young Scholars [51225901]
- National Natural Science Foundation of China [51479047, 51422902]
- Fundamental Research Funds for the Central Universities [2015B22014]
- PAPD
Extracellular polymeric substances (EPS) are key components of the cyanobacterium Microcystis aeruginosa and play an important role in cyanobacteria blooms formation. Here, we analyzed the effects of 48-h exposure to nanosized CeO2 (n-CeO2), CuO (n-CuO), and ZnO (n-ZnO) on the production and composition of EPS of M. aeruginosa. Toxicity experiments revealed that soluble nanoparticles (NPs) (n-ZnO, n-CuO) demonstrated higher toxicity to cells and caused membrane damage. The production of LB-EPS increased by 34.48, 20.09, and 46.33 %, and TB-EPS increased by -5.78, 22.3, and -2.67 % in the presence of n-CeO2, n-CuO, and n-ZnO NPs, respectively, and polysaccharides are the main incremental portion compared with protein and humic acids. Three-dimensional excitation-emission fluorescence spectra revealed the enhancement of fulvic-humic-like and disappearance of tyrosine aromatic substances in TB-EPS compared with the slight changes observed in LB-EPS. Fourier-transform infrared spectroscopy illustrated the susceptibility of -NH2 and double-bonded carbon and oxygen in amides to three types of NPs. These results improve our understanding of the potential influence of NPs on the aggregation behaviors of cyanobacteria and formation process of cyanobacteria blooms.
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