建立了液相色谱-串联质谱法同时测定牛奶和奶粉中4种青霉素(青霉素G、青霉素V、阿莫西林、氨苄西林)及其4种β-内酰胺酶酶解产物(青霉素G脱羧噻唑酸、青霉素V脱羧噻唑酸、阿莫西林脱羧噻唑酸、氨苄西林脱羧噻唑酸)残留的方法.样品采用乙腈-水提取,浓缩后经HLB柱净化,用液相色谱-串联质谱检测,外标法定量.结果表明,青霉素原药在4 ~ 200 μg/L,酶解产物在10 ~ 500 μg/L范围呈良好线性,线性相关系数均大于0.99;样品检出限为5 ~50 μg/kg(S/N≥3),定量限为8~ 100 μg/kg(S/N≥10);对牛奶和奶粉样品分别进行3个水平的加标回收实验(n=6),牛奶中青霉素及其酶解产物的平均回收率为83.48%~96.97%,相对标准偏差为3.86%~10.87%;奶粉中青霉素及其酶解产物的平均回收率为82.70%~95.14%,相对标准偏差为3.02%~ 9.81%.该方法稳定、可靠,适用于牛奶和奶粉中青霉素类药物及其酶解代谢产物的测定.
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