超高效液相色谱-串联质谱法检测猪肉和猪肾中残留的10种镇静剂类药物

Determination of ten sedative residues in pork and kidney by ultra performance liquid chromatography-tandem mass spectrometry

建立了猪肉和猪肾中安眠酮、氯丙嗪、异丙嗪、地西泮、硝西泮、奥沙西泮、替马西泮、咪达唑仑、三唑仑和唑吡旦10种镇静剂类药物残留检测的超高效液相色谱-串联质谱分析方法。样品经酶解后,调节pH值呈碱性,分别用乙酸乙酯和叔丁基甲醚进行萃取,高速冷冻离心去除脂肪等杂质。提取液经WatersAcquityUPLCBEHC18色谱柱分离,以0.1%甲酸乙腈溶液和0.1%甲酸水溶液为流动相进行梯度洗脱。电喷雾正离子(ESI+)模式电离,多反应监测(MRM)模式检测,基质匹配标准溶液法进行定量。结果表明:10种镇静剂在2～100μg/L范围内呈良好的线性关系,相关系数(r)均大于0.998;10种镇静剂的检出限(S/N>3)为0.5μg/kg,定量限(S/N>10)为1μg/kg。3个添加水平的回收率为64.5%～111.4%,批内、批间相对标准偏差(RSD)均小于15%。该方法具有简便快捷、灵敏度高、定性准确等特点。

An ultra performance liquid chromatography-tandem mass spectrometry （UPLC-MS/MS）method was established for the determination of methaqualone, chloropromazine, promethazine, diazepam, nitrazepam, oxazepam, temazepam, midazolam, triazolam and zolpidem residues in pork and kidney. After enzymolysis, the samples were extracted by ethyl acetate and tert-butyl methyl ether, separately. The separation of the ten sedatives was performed on a Waters Acquity UPLC system with a BEH C18 column. The mobile phases were acetonitrile （containing 0.1% formic acid） and water （containing 0.1% formic acid） at a flow rate of 0.3 mL/min. The electrospray was operated in the positive ionization mode and the ten sedatives were identified by multiple reaction monitoring （MRM） mode. The method of matrix-matched standard solution was adopted as the quantitative method. The calibration curves showed good linearity within the concentrations of 2-100 μg/L with the correlation coefficients r0.998. The limits of detection of the ten sedatives were 0.5 μg/kg, and the limit of quantification was 1 μg/kg. The recoveries of the ten sedatives were 64.5%-111.4% at the spiked levels of 2, 5 and 10 μg/kg. The relative standard deviations of intra- and inter-day coefficients of variation were both less than 15%. This method is simple, sensitive and accurate in the determination of sedative residues.