Enantioselective residue dissipation of hexaconazole in cucumber (Cucumis sativus L.), head cabbage (Brassica oleracea L. var. caulorapa DC.), and soils |
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Authors: | Wang Xinquan Zhang Hu Xu Hao Wang Xiangyun Wu Changxing Yang Hongda Li Zhen Wang Qiang |
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Institution: | State Key Laboratory Breeding Base for Zhejiang Sustainable Plant Pest Control, MOA Key Laboratory for Pesticide Residue Detection, Institute of Quality and Standard for Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China. |
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Abstract: | In this study, the enantioselective dissipation behavior of hexaconazole was investigated in cucumber fruit, head cabbage, and two different types of agricultural soils. The dissipation kinetics was determined by reverse-phase liquid chromatography-tandem mass spectrometry on a cellulose tris (3-chloro-4-methylphenylcarbamate) chiral column. Dissipation rates of hexaconazole enantiomers followed first-order kinetics; the residues of (+)-enantiomer decreased more rapidly than (-)-enantiomer in cucumber and head cabbage, resulting in relative enrichment of the (-)-form, while the two enantiomers showed similar degradation rates in the tested soils. These results indicate substantial enantioselectivity in the residue dissipation of hexaconazole enantiomers in cucumber and head cabbage; however, nonenantioselective dissipation was observed in the tested soils. |
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