title: Removal and reductive dechlorination of triclosan by Chlorella pyrenoidosa.
abstract: Triclosan that is widely used as antimicrobial agent has been detected as contaminant in various aquatic environments. In this work, removal and biodegradation of triclosan in water by using a ubiquitous green alga, Chlorella pyrenoidosa was investigated. When C. pyrenoidosa was exposed to a series concentration of triclosan from 100 to 800ngmL(-1), more than 50% of triclosan was eliminated by algal uptake from the culture medium during the first 1h exposure and reached equilibrium after the 6h treatment. In the biodegradation experiments, a removal percentage of 77.2% was obtained after C. pyrenoidosa was cultivated with 800ngmL(-1) triclosan for 96h. A major metabolite from the reductive dechlorination of triclosan was identified by using liquid chromatography coupled with electrospray ionization-mass spectrometry. The ultrastructural morphology of algal cells grown in the presence of triclosan was observed by using transmission electron microscopy and the growth of algal cells was detected. It was found that the trilcosan treatment resulted in the disruption of the chloroplast and the release of organic material into aquatic environment, which indicated that triclosan may affect membrane metabolism.
authors: Beijing Normal University-Hong Kong Baptist University, United International College, Zhuhai, China.
authors: Shujuan
authors: S
authors: Wang
authors: Xian
authors: X
authors: Wang
authors: Karen
authors: K
authors: Poon
authors: Yini
authors: Y
authors: Wang
authors: Shangfu
authors: S
authors: Li
authors: Hongxia
authors: H
authors: Liu
authors: Shuhai
authors: S
authors: Lin
authors: Zongwei
authors: Z
authors: Cai
mesh_terms: D001673:Biodegradation, Environmental; D002708:Chlorella / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D054879:Halogenation; D010084:Oxidation-Reduction; D014260:Triclosan / Q000302:isolation & purification* / Q000378:metabolism* / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000378:metabolism* / Q000633:toxicity
chemical_list: D014874:Water Pollutants, Chemical; D014260:Triclosan
keywords: Chlorella pyrenoidosa; Reductive dechlorination; Removal; Triclosan