Microbial metabolism of fluazifop-butyl

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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‐trifluoromethyl pyridyl) hydroxy acetate.

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