Microbial detoxification of bifenthrin by a novel yeast and its potential for contaminated soils treatment.

PloS One
Shaohua ChenYanbo Zhang

Abstract

Bifenthrin is one the most widespread pollutants and has caused potential effect on aquatic life and human health, yet little is known about microbial degradation in contaminated regions. A novel yeast strain ZS-02, isolated from activated sludge and identified as Candida pelliculosa based on morphology, API test and 18S rDNA gene analysis, was found highly effective in degrading bifenthrin over a wide range of temperatures (20-40 °C) and pH (5-9). On the basis of response surface methodology (RSM), the optimal degradation conditions were determined to be 32.3 °C and pH 7.2. Under these conditions, the yeast completely metabolized bifenthrin (50 mg · L(-1)) within 8 days. This strain utilized bifenthrin as the sole carbon source for growth as well as co-metabolized it in the presence of glucose, and tolerated concentrations as high as 600 mg · L(-1) with a q(max), K(s) and K(i) of 1.7015 day(-1), 86.2259 mg · L(-1) and 187.2340 mg · L(-1), respectively. The yeast first degraded bifenthrin by hydrolysis of the carboxylester linkage to produce cyclopropanecarboxylic acid and 2-methyl-3-biphenylyl methanol. Subsequently, 2-methyl-3-biphenylyl methanol was further transformed by biphenyl cleavage to form 4-trifluoromethoxy phenol, ...Continue Reading

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Citations

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Datasets Mentioned

BETA
JN700989

Methods Mentioned

BETA
chemical modification

Software Mentioned

BLAST
matrix laboratory ( MATLAB )
statistic analysis system ( SAS )
CLUSTALX
SAS
MEGA

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