建立了同时测定番茄酱中链霉素和双氢链霉素残留量的串联双柱净化-液相色谱-串联质谱方法.样品中的残留物用磷酸盐缓冲液(pH 4)提取,经分散固相萃取净化和串联双柱固相萃取净化后,用极性色谱柱在梯度洗脱条件下分离待测物,采用正离子电喷雾离子源(ESI+)在多反应监测( MRM)扫描模式下进行测定,外标法定量.链霉素和双氢链霉素在0.01~0.2 mg/L质量浓度范围内线性关系良好,相关系数(r)大于0.999.链霉素和双氢链霉素的定量限均为0.02 mg/kg,回收率为71%~101%,相对标准偏差为2.3%~15%.该方法操作简便,净化效果好,灵敏,准确,适用于检测和分析番茄酱及其制品中链霉素和双氢链霉素残留量.
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