Journal of Environmental Science and Health, Part B: Pesticides, Food Contaminants and Agricultural Wastes 1993-10-01

Microbial metabolism of fluazifop-butyl.

M Nègre, M Gennari, V Andreoni, R Ambrosoli, L Celi

Index: J. Environ. Sci. Health B 28(5) , 545-76, (1993)

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Abstract

A microbial mixed culture able to grow on fluazifop-butyl and fluazifop was isolated. Fluazifop degradation by this microbial population was studied either when the herbicide was applied as the sole carbon source or in the presence of a second carbon source (sodium acetate or sodium propionate). The degradation rate was enhanced by sodium propionate. The degradation was found to be stereoselective. The S-enantiomer of fluazifop was degraded at a much higher rate than the R-enantiomer. Fluazifop disappearance was accompanied by formation of three metabolites which were identified by UV, IR, MS and NMR analyses. The metabolites were shown to be: 4-(5-trifluoromethyl-2-pyridyl)oxyphenol, 5-trifluoromethyl-2- hydroxypyridine and 2-(5-trifluoro-methyl pyridyl)hydroxy acetate.