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

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Abstract

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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Funding

This study was supported by grants from the Special Fund for Agro-scientific Research in the Public Interest (Grant No. 201503107-12), Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ14B070004, LQ15B050001), the National Natural Science Foundation of China (Grant No. 31501556), and the Special Fund for Public Projects of Zhejiang Province (Grant No.2016C32042).

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Authors and Affiliations

  1. Northeast Agricultural University, Harbin, 150030, China

    Lidong Wang, Yuhan Sun, Xuewei Yang & Changshan Zhao

  2. Institute of Quality and Standard of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China

    Xiangyun Wang, Shanshan Di, Peipei Qi & Xinquan Wang

  3. Agricultural Ministry Key Laboratory for Pesticide Residue Detection, Hangzhou, 310021, China

    Xiangyun Wang, Shanshan Di, Peipei Qi & Xinquan Wang

  4. Key Laboratory of Detection for Pesticide Residues and Control of Zhejiang, Hangzhou, 310021, China

    Xiangyun Wang, Shanshan Di, Peipei Qi & Xinquan Wang

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  1. Lidong Wang
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  2. Xiangyun Wang
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  3. Shanshan Di
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  4. Peipei Qi
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  5. Yuhan Sun
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  7. Changshan Zhao
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  8. Xinquan Wang
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Correspondence to Changshan Zhao or Xinquan Wang.

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Responsible editor: Thomas D. Bucheli

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Wang, L., Wang, X., Di, S. et al. Enantioselective analysis and degradation of isofenphos-methyl in vegetables by liquid chromatography-tandem mass spectrometry. Environ Sci Pollut Res 25, 18772–18780 (2018). https://doi.org/10.1007/s11356-018-1707-x

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