数字农科院2.0

Enantioseparation and dissipation of acephate and its highly toxic metabolite methamidophos in pakchoi by supercritical fluid chromatography tandem mass spectrometry

文献类型： 外文期刊

作者： Jiang, Linjie;Geng, Yue;Wang, Lu;Peng, Yi;Jing, Wei;Xu, Yaping;Liu, Xiaowei

作者机构：

关键词： acephate;dissipation;enantioselective separation;methamidophos;pakchoi

期刊名称： Journal of Separation Science

ISSN： 1615-9306

年卷期： 2022 年

页码：

收录情况： SCIE（2022版） ; EI（2022版）

摘要： Acephate is widely used in crops as racemate. However, the enantioselective dissipation of acephate enantiomers has not been investigated in pakchoi. A sensitive and effective approach was established for determining residues of acephate and its highly toxic metabolite methamidophos enantiomers by supercritical fluid chromatography tandem mass spectrometry. Baseline separations for their enantiomers were achieved by using a Chiralcel OD-H column. The optimal chromatographic conditions were obtained as follows: CO2/ethanol (95/5) as mobile phase; flow rate, 3.0 mL/min; column temperature, 40 degrees C. The mean recoveries (RSDs) of analytes were in the range of 77-83.1% (6.1-9.9%), 75.4-87.5% (9.3-13.2%), and 81.5-84.2% (7.1-13.4%) at three fortification levels (0.005, 0.05, and 0.5 mg/kg for each enantiomer) for interday assay (n = 18). The method was used to evaluate the enantioselective dissipation of acephate and methamidophos in pakchoi. S-acephate dissipated faster than R-acephate, while the concentration of R-methamidophos was higher than that of S-methamidophos during the entire study period. The results indicated that the R-enantiomer of acephate and methamidophos was preferentially enriched in pakchoi. The established analysis approach and the study data provided useful information for the rational use of acephate in agriculture.

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