Interactions between the antimicrobial agent triclosan and the bloom-forming cyanobacteria Microcystis aeruginosa

Aquatic Toxicology
Xiaolong HuangChenxi Wu

Abstract

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 96h lowest observed effect concentration of 1.0 and 10μg/L for inhibition of growth and photosynthetic activity, respectively. Exposure to TCS at environmentally relevant levels (0.1-2.0μg/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.

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Citations

May 10, 2017·Environmental Science. Processes & Impacts·Michael A StravsJuliane Hollender
Dec 24, 2018·Applied Microbiology and Biotechnology·Beata Żyszka-HaberechtJacek Lipok
May 30, 2019·International Journal of Molecular Sciences·Krystian Miazek, Beata Brozek-Pluska
May 12, 2018·Environmental Science and Pollution Research International·Lalliansanga NilSeung Mok Lee
Feb 20, 2021·Journal of Environmental Management·Ranbin LiuXiaodi Hao
Dec 4, 2020·Journal of Hazardous Materials·Sufia HenaJean-Philippe Croué
Jun 13, 2021·Environmental Science and Pollution Research International·Rafaela Dos Santos CostaJulio Alejandro Navoni
Aug 28, 2021·Environmental Pollution·Saurav KumarChandra Bhushan Kumar

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