Stereoselective dissipation of epoxiconazole in grape (Vitis vinifera cv. Kyoho) and soil under field conditions

文献类型： 外文期刊

第一作者： Liang, Hongwu

作者： Liang, Hongwu;Li, Li;Li, Wei;Qiu, Jing;Liang, Hongwu;Zhou, Zhiqiang;Liu, Fengmao;Qiu, Lihong

作者机构：

关键词： epoxiconazole;stereoselectivity;dissipation;LC-MS/MS;grape;soil

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Stereoselective dissipation of epoxiconazole had been studied in grape and soil during plant growing under field conditions in this paper. A sensitive and rapid chiral method was developed and validated for the determination of epoxiconazole stereoisomers in grape and soil based on liquid chromatography coupled with triple quadrupole mass spectrometry (LC-MS/MS). Phenomenex Lux Cellulose-1 column was used for enantioseparation with a mixture of acetonitrile/water (90/10, v/v) as mobile phase at flow rate of 0.3 mL min~(-1). Fortified recoveries in grape and soil samples ranged from 76.0% to 91.9% and relative standard deviations were less than 11.4% with fortified levels of 0.025-1.0 mg kg~(-1) The limits of detection and quantification were 0.005 mg kg~(-1) and 0.025 mg kg~(-1), respectively, with linear calibration curves extending up to 5.0 mg kg~(-1) The field experimental results showed that dissipations of epoxiconazole stereoisomers in grape followed first-order kinetics (R~2 > 0.92) and stereoselectivity occurred in 2 h after spraying. The (-)-stereoisomer with half-life of 9.3 d degraded faster than (+)-stereoisomer with that of 13.2 d, and resulted in relative enrichment of (+)-stereoisomer. However, the stereoisomeric dissipations in soil were triphasic ("increase-decrease-steady") with lower dissipation rates, and also occurred with preferential degradation of (-)-stereoisomer under field condition. The results for stereoselective dissipations can be applied for food and environmental assessments of chiral pesticides.

分类号： X5

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