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Enantioselective determination of acaricide etoxazole in orange pulp, peel, and whole orange by chiral liquid chromatography with tandem mass spectrometry

文献类型： 外文期刊

作者： Yao, Zhoulin 1 ; Li, Zuguang 3 ; Zhuang, Shulin 4 ; Li, Xiaoge 5 ; Xu, Mingfei 2 ; Lin, Mei 1 ; Wang, Qiang 2 ; Zhang, Hu 2 ;

作者机构： 1.Zhejiang Acad Agr Sci, Zhejiang Citrus Res Inst, Taizhou, Peoples R China

2.Zhejiang Acad Agr Sci, MOA Key Lab Pesticide Residue Detect, Inst Qual & Stand Agr Prod, Hangzhou 310021, Zhejiang, Peoples R China

3.Zhejiang Univ Technol, Coll Chem Engn, Hangzhou, Zhejiang, Peoples R China

4.Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310003, Zhejiang, Peoples R China

5.Chinese Acad Sci, Shanghai Inst Organ Chem, Shanghai 200032, Peoples R China

关键词： Absolute configuration;Chiral analysis;Etoxazole;Liquid chromatography with tandem mass spectrometry;Orange

期刊名称：JOURNAL OF SEPARATION SCIENCE （ 影响因子：3.645； 五年影响因子：2.943 ）

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收录情况： SCI

摘要： An efficient enantioselective method for the determination of etoxazole in orange pulp, peel, and whole orange was developed using liquid chromatography with tandem mass spectrometry. The enantioseparation was performed on a Chiralpak AD-3R column at 30 degrees C using acetonitrile with 0.1% formic acid solution (80: 20, v/v) as the mobile phase in less than 5 min. Quantification was achieved using matrix-matched standard calibration curves. The overallmean recoveries for two enantiomers from orange pulp and whole orange were 91.0-99.6% and the orange peel was 92.6-103.1%, with relative standard deviations of 0.8-5.4% intraday and 2.0-4.8% interday at 1, 10, and 100 mu g/kg levels, and 1.3-5.2% intraday and 3.5-4.3% interday at 5, 50, and 500 mu g/kg levels, respectively. The limits of quantification for all enantiomers in three matrices did not exceed 5 mu g/kg. Moreover, the absolute configuration of etoxazole enantiomers had been determined by the combination of experimental and predicted electronic circular dichroism spectra, and the first eluted enantiomer was confirmed as (S)-etoxazole on a Chiralpak AD-3R column while (R)-etoxazole was first on three cellulose chiral columns. The application of the proposed method to real sample analysis suggests its potential use in enantioselective determination of etoxazole enantiomers in citrus.

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