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Enantioselective degradation of the chiral alpha-cypermethrin and detection of its metabolites in five plants

Yao, Guojun, Gao, Jing, Zhang, Chuntao, Jiang, Wenqi, Wang, Peng, Liu, Xueke, Liu, Donghui, Zhou, Zhiqiang
Environmental science and pollution research international 2019 v.26 no.2 pp. 1558-1564
cabbage, cucumbers, cypermethrin, enantiomers, enantioselectivity, foliar spraying, food safety, gas chromatography, half life, human health, humans, metabolism, metabolites, risk, tomatoes
Alpha-cypermethrin (α-cypermethrin), an important chiral pyrethroid insecticide, is frequently detected in human samples. Because of the possible human health risks caused by α-cypermethrin, we studied dynamics, residues, and metabolism of α-cypermethrin in five common vegetables (tomato, cucumber, rape, cabbage, and pepper) on enantiomeric levels after foliar spray. α-Cypermethrin was qualified by a HP-5 column and its enantiomers could be separated by gas chromatograph (GC) using a BGB-172 chiral column. The results of degradation showed that α-cypermethrin dissipated rapidly in vegetables with half-lives being only 2.85–8.88 days. Stereoselective degradation was observed on pepper and cucumber while the two metabolites (cis-DCCA and 3-PBA) of α-cypermethrin were not detected during its dissipation in all plants. This is the first evidence of enantioselective degradation of α-cypermethrin in the five common vegetables and the results should be considered in future environmental risk and food safety evaluations.