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Uptake, Metabolism, and Effects on Detoxication Enzymes of Isoproturon in Spawn and Tadpoles of Amphibians.
Ecotoxicol. Environ. Saf. 52, 256-266 (2002)
Using ring-C-14-labeled isoproturon (1 mug/L), the uptake into spawn and tadpoles of Bombina bombina and Bombina variegata was investigated. Two percent of the applied radioactivity was found per gram fresh weight in the embryo after 24 h. Results indicate that the jelly mass of the spawn does not act as a sufficient physical barrier for protection against the uptake and influence of isoproturon (IPU) on the embryo. In vivo metabolism of ring-C-14-labeled IPU by the cytochrome P-450 system was analyzed in tadpoles. Different metabolites of IPU, such as N-demethylated and C-hydroxylated derivatives, and the olefinic metabolite were detected. In tadpoles of B. variegata, the activity of microsomal and soluble glutathione-S-transferase (sGSTs) toward different model substrates was measured after treatment with IPU. Activities of sGST increased corresponding to elevated stress by IPU dependent on exposure time and dose. Compared to the pure active ingredient IPU, the commercial phenyl-urea herbicide Tolkan Flo, consisting of IPU and an emulsifier, also caused significantly elevated enzymatic response.
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1.252
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25
32
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
isoproturon; herbicide; amphibians; spawn; tadpoles; microsomal and soluble gluthione-S-transferase
Language
english
Publication Year
2002
HGF-reported in Year
0
ISSN (print) / ISBN
0147-6513
e-ISSN
0147-6513
Quellenangaben
Volume: 52,
Issue: 3,
Pages: 256-266
Publisher
Elsevier
Reviewing status
Peer reviewed
Institute(s)
Institute of Groundwater Ecology (IGOE)
Research field(s)
Environmental Sciences
PSP Element(s)
FE 74331
Erfassungsdatum
2002-10-25