Journal
AQUATIC TOXICOLOGY
Volume 172, Issue -, Pages 103-110Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aquatox.2016.01.002
Keywords
Triclosan; Eutrophication; Toxicity; Biotransformation; Photodegradation
Categories
Funding
- National Natural Science Foundation of China [41103064]
- National Major Science and Technology Projects for Pollution Control and Management [2012ZX07104-002-005, 2012ZX07101-007-002]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
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Cyanobacteria can co-exist in eutrophic waters with chemicals or other substances derived from personal care products discharged in wastewater. In this work, we investigate the interactions between the antimicrobial agent triclosan (TCS) and the bloom-forming cyanobacteria Microcystis aeruginosa. M. aeruginosa was very sensitive to TCS with the 96 h lowest observed effect concentration of 1.0 and 10 mu g/L for inhibition of growth and photosynthetic activity, respectively. Exposure to TCS at environmentally relevant levels (0.1-2.0 mu g/L) also affected the activities of superoxide dismutase (SOD) and the generation of reduced glutathione (GSH), while microcystin production was not affected. Transmission electron microscope (TEM) examination showed the destruction of M. aeruginosa cell ultrastructure during TCS exposure. TCS however, can be biotransformed by M. aeruginosa with methylation as a major biotransformation pathway. Furthermore, the presence of M. aeruginosa in solution promoted the photodegradation of TCS. Overall, our results demonstrate that M. aeruginosa plays an important role in the dissipation of TCS in aquatic environments but high residual TCS can exert toxic effects on M. aeruginosa. (C) 2016 Elsevier B.V. All rights reserved.
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