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Residue Determination of cis-Epoxiconazole Enantiomers in Fruit and Tea by Ultra Performance Convergence Chromatography Combined with Quadrupole Time-of-Flight Mass Spectrometry

文献类型： 外文期刊

作者： Zhao Yue-Chen;Cui Xin-Yi;Zhang Xin-Zhong;Luo Feng-Jian;Zhou Li;Chen Zong-Mao

作者机构：

关键词： Chiral enantiomers;Residue analysis;cis-Epoxiconazole;Apple;Grape;Tea;Ultra performance;convergence chromatography combined with quadrupole time-of-flight mass spectrometry

期刊名称： CHINESE JOURNAL OF ANALYTICAL CHEMISTRY

ISSN： 0253-3820

年卷期： 2016 年 44 卷 8 期

页码：

收录情况： SCI

摘要： A chiral separation and residue determination method for cis-epoxiconazole enantiomers in apple, grape and tea samples was developed and validated by ultra performance convergence chromatography used to separate cis-epoxiconazole enantiomers and the chromatography conditions ( mobile phase modifier and proportion, column temperature, automated backpressure regulator, and auxiliary solvent) were optimized. Samples were extracted by acetonitrile, and respectively purified by Cleanert TPT or Pesti-Carb solid phase extraction ( SPE) columns, then analyzed by UPC2-QTOF/MS. The optimum conditions were as follows: mobile phase was CO2/isopropanol ( 95 : 5, V/V), flow. rate was 2. 0 mL/min, automated backpressure regulator ( ABPR) was 13. 79 MPa, column temperature was 30 degrees C, with a post. column mauxiliary solvent of methanol/water ( 1:1, V/V) containing 2 mmol/L ammonium formate. The analyte was quantified by matrix external standard method. The results showed that linear range of this method was 0. 01-1. 00 mg/L, and the correlation coefficients were above 0. 99. The recoveries of cis-epoxiconazole enantiomers at three spiked levels ( 0. 005, 0. 025 and 0. 25 mg/kg) in fruit matrix were 67. 9%-92. 8% with relative standard deviations (RSDs, n = 6) less than 10%, and the limit of quantification ( LOQ) of enantiomers was 0. 005 mg/kg. The recoveries of cis-epoxiconazole enantiomers at three spiked levels ( 0. 01, 0. 05 and 0. 5 mg/kg) in black tea were 74. 1% -84. 0% with RSDs ( n = 6) less than 8%, and the LOQ for these two enantiomers was 0. 01 mg/kg. This method is rapid, convenient and reliable, and could meet the requirement of residue analysis.

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