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.
J Agric Food Chem. 2012 Mar 7;60(9):2212-8. doi: 10.1021/jf204523t. Epub 2012 Feb 21.
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.
在这项研究中，考察了己唑醇在黄瓜果实、结球甘蓝和两种不同类型农业土壤中的对映体选择性消解行为。通过纤维素三（3-氯-4-甲基苯基碳酸酯）手性柱上的反相液相色谱-串联质谱法确定了消解动力学。己唑醇对映体的消解动力学遵循一级动力学；在黄瓜和结球甘蓝中，（+）-对映体的残留比（-）-对映体更快地减少，导致（-）-形式相对富集，而在测试土壤中，两种对映体表现出相似的降解速率。这些结果表明己唑醇对映体在黄瓜和结球甘蓝中的残留消解存在显著的对映体选择性；然而，在测试土壤中观察到非对映体选择性消解。
