建立了同时分离检测牛奶中的氨苄西林、阿莫西林、青霉素V和头孢氨苄4种β-内酰胺类抗生素的固相萃取-胶束电动色谱法.牛奶样品经沉淀蛋白后,采用HLB固相萃取柱净化浓缩;以含十二烷基硫酸钠(SDS)的磷酸盐为缓冲液,胶束电动色谱分离,210 nm波长下检测.分离电压为18 kV,于9 min内达到基线分离.各组分在0.5～20 mg/L范围内呈良好的线性关系,相关系数(r2)为0.994 3～0.997 6;检出限为0.16～0.20 mg/L;除了阿莫西林外,回收率均大于70%.该方法准确可靠,重复性好,灵敏度高,可以用于牛奶中β-内酰胺类抗生素的定量检测.
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