Enantioselective residue dissipation of hexaconazole in cucumber (Cucumis sativus L.), head cabbage (Brassica oleracea L. var. caulorapa DC.), and soils.
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.
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.
Xinquan
X
Wang
Hu
H
Zhang
Hao
H
Xu
Xiangyun
X
Wang
Changxing
C
Wu
Hongda
H
Yang
Zhen
Z
Li
Qiang
Q
Wang
D001937:Brassica / Q000737:chemistry* / Q000378:metabolism; D056148:Chromatography, Reverse-Phase; D028462:Cucumis / Q000737:chemistry* / Q000378:metabolism; D005659:Fungicides, Industrial; D007700:Kinetics; D015203:Reproducibility of Results; D012987:Soil / Q000032:analysis*; D013237:Stereoisomerism; D053719:Tandem Mass Spectrometry; D014230:Triazoles / Q000032:analysis* / Q000737:chemistry* / Q000378:metabolism
D005659:Fungicides, Industrial; D012987:Soil; D014230:Triazoles; C409722:hexaconazole