Abstract
建立了婴幼儿配方乳粉中三聚氰胺、氯霉素、甲硝唑和洛硝达唑残留的高效液相色谱-串联四极杆质谱联用测定方法。样品经碱性乙腈提取,以MGⅢ-C18色谱柱(150 mm×2.1 mm,5!m)分离,流动相为60 mmol/L乙酸铵溶液(含0.4‰甲酸)和甲醇,梯度洗脱,流速为0.25 mL/min。采用多反应监测正离子或负离子模式,可以同时对婴幼儿配方乳粉中的三聚氰胺、氯霉素、甲硝唑和洛硝达唑进行快速定性和定量测定。在优化条件下,4种化合物检出限为0.3~50.0!g/kg,方法回收率为61.4%~96.2%,相对标准偏差(RSD)为1.8%~9.8%。采用本方法测定了多种市售婴幼儿配方奶粉。本方法操作简单、测定结果准确,可用于婴幼儿配方奶粉中三聚氰胺、氯霉素、甲硝唑和洛硝达唑残留的同时快速测定。
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