Determination of Clotrimazole Residue in Animal-Derived Food by Gas Chromatography-Tandem Mass Spectrometry with Isotope Dilution
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摘要: 建立了动物源食品(猪肉、鸡肉、猪脂肪、猪心、猪肝、猪肾)中克霉唑残留量的同位素稀释气相色谱-串联质谱(GC-MS/MS)测定方法。样品经加速溶剂提取后,用凝胶渗透色谱净化。采用HP-5 MS色谱柱(30 m×0.25 mm×0.25 μm)进行分离,多反应监测(MRM)模式检测,同位素内标法定量。实验结果表明,克霉唑在1~100 μg/L浓度范围内线性良好,决定系数(R2)为0.9995,定量限(LOQ,S/N≥10)为2.0 μg/kg。在2.0、5.0、20.0 μg/kg加标水平下,回收率在82.6%~116.5%之间,相对标准偏差为5.2%~13.5%。该方法灵敏度高、准确性好,能够满足动物源食品中克霉唑残留量的确证和定量分析。
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关键词:
- 动物源食品 /
- 克霉唑 /
- 残留 /
- 同位素稀释 /
- 气相色谱-串联质谱法
Abstract: An isotope dilution gas chromatography-tandem mass spectrometry(GC-MS/MS)method for the determination of clotrimazole residues in animal-derived food(Pork,chicken,pig fat,pig heart,pig liver,pig kidney)was established. The samples were extracted with accelerated solvent extraction,and cleaned up by gel permeation chromatography. HP-5 MS chromatographic column(30 m×0.25 mm×0.25 μm)was used for separation,multi-reaction monitoring(MRM)mode detection,and isotope internal standard method for quantification. Results showed that there was a good linearity for clotrimazole in the range of 1~100 μg/L with a correlation coefficient(R2)of 0.9995. The limit of quantitation(LOQ,S/N≥10)of the method was 2.0 μg/kg. The average recoveries at three spiking levels(2.0,5.0,20.0 μg/kg)were 82.6%~116.5%. Relative standard deviation(RSD)were 5.2%~13.5%. This method has high sensitivity and accuracy,and can be used for the confirmation and quantitative analysis of clotrimazole residues in animal-originated foodstuffs. -
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