Enantioselective analysis and degradation of isofenphos-methyl in vegetables by liquid chromatography-tandem mass spectrometry

文献类型： 外文期刊

第一作者： Wang, Lidong

作者： Wang, Lidong;Sun, Yuhan;Yan, Xuewei;Zhao, Changshan;Wang, Xiangyun;Di, Shanshan;Qi, Peipei;Wang, Xinquan;Wang, Xiangyun;Di, Shanshan;Qi, Peipei;Wang, Xinquan;Wang, Xiangyun;Di, Shanshan;Qi, Peipei;Wang, Xinquan

作者机构：

关键词： Isofenphos-methyl; Enantioselective degradation; Cowpea; Cucumber; Pepper; LC-MS/MS

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

年卷期： 2018 年 25 卷 19 期

页码：

收录情况： SCI

摘要： The enantioselective degradation of isofenphos-methyl in cowpea, cucumber, and pepper under field conditions was investigated to elucidate the enantioselective environmental behaviors of this pesticide. The concentrations of the enantiomers were determined by liquid chromatography-tandem mass spectrometry (LC-MS/MS). The degradation rates of isofenphos-methyl enantiomers were the fastest in cowpea, followed by cucumber and pepper, with half-lives ranging from 1.48 to 8.06 days. The enantioselective degradation of isofenphos-methyl was characterized by calculating and comparing the values of enantiomer fraction (EF) and enantiomeric selectivity (ES). The degradation rates and enantioselectivities of isofenphos-methyl were different for the three vegetables. (R)-(-)-isofenphos-methyl was degraded faster than (S)-(+)-isofenphos-methyl in cowpea and cucumber, whereas (S)-(+)-isofenphos-methyl underwent preferential degradation in pepper. These results could serve as a reference for the study of enantioselective behavior of isofenphos-methyl in plants and further food safety evaluation, where the enantiomeric differences should be considered in the risk assessment.

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