建立了食品中多杀菌素(spinosyn)A和D残留的液相色谱-串联质谱(HPLC-MS/MS)检测方法.甘蓝等食品样品经乙腈-水(50:50,v/v)提取、HLB固相萃取柱净化后,采用HPLC-MS/MS进行检测分析,利用外标法定量.质谱分析采用电喷雾电离,正离子扫描,多反应监测模式.结果表明,柱净化后无明显的基质效应,多杀菌素在1~20 μg/L内具有较好的线性关系,其相关系数可达0.999 9;样品中添加1~10μg/kg的多杀菌素,其回收率为76.2%~114.0%,相对标准偏差(n=10)小于10%;检出限(信噪比(S/N)=3):多杀菌素A为0.2μg/kg,多杀菌素D为0.5μg/kg;定量限(S/N=10):多杀菌素A为0.5μg/kg,多杀菌素D为1.0μg/kg.在最佳实验条件下,对来自福建厦门的969份食品样品进行了检测,其中15份样品检测结果呈阳性.实验结果表明,该方法提取效果好,具有良好的灵敏度、回收率和重复性.
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