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采用超高效液相色谱-串联质谱(UPLC-MS/MS)在正离子模式下通过多反应监测(MRM)方式同时测定了鸡肝脏组织中3种四环素类药物、10种磺胺类药物以及8种喹诺酮类药物的残留.试样由McIlvaine缓冲液-乙腈(体积比为1∶4)、乙腈提取,合并上清液并用氮气吹干,用0.05 mol/L 磷酸三乙胺缓冲液-乙腈(体积比为85∶15)溶解残余物,经正己烷脱脂后,采用UPLC-MS/MS进行定性、定量分析.该方法对测定的21种药物的检出限均为 2 μg/kg,定量限均为5 μg/kg.在添加水平分别为5,10和50 μg/kg 时,21种药物的加标回收率为66.8% ~128.5% ,日内测定的相对标准偏差(RSD)为0.8% ~20.2% ,日间测定的RSD为2.2% ~15.3% .该方法可作为动物源性食品中这3类药物残留检测的确证方法.

参考文献

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