Journal
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
Volume 86, Issue 5, Pages 470-475Publisher
SPRINGER
DOI: 10.1007/s00128-011-0249-4
Keywords
Triclosan; Photodegradation; Frontier electron density; Thyroid hormone activity
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The photodegradation pathways of 2-(2,4-dichlorophenoxy)-5-chlorophenol (triclosan) in water were studied. The main purposes were to identify structures of intermediates derived by radical reaction using TiO2 advanced oxidation processes and to evaluate the endocrine disrupting activities in treated triclosan during oxidative reactions. Intermediates such as dichlorophenols, 2,8-dibenzo-p-dioxin, tetrachlorinated diphenyl ether (tetraclosan) and hydroxylated triclosan were produced by photoreaction. The estrogen, thyroid hormone and retinoid X receptor activities of the treated triclosan were measured with the yeast two-hybrid assay. It was found that tetraclosan and 2,4-dichlorophenol have stronger thyroid hormone activities than triclosan in the presence of S9.
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