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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.