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建立了同时测定配合饲料中喹诺酮类、磺胺类、大环内酯类和硝基呋喃类共计29种兽药的超高效液相色谱-电喷雾串联四极杆质谱(UPLC-ESI-MS/MS)检测方法.饲料样品用甲醇-乙腈(1∶1,v/v)混合溶液提取,提取液经Oasis HLB 固相萃取柱净化,采用 UPLC-ESI-MS/MS检测.以甲醇和含0.1% (v/v)甲酸的水溶液作为流动相,进行梯度洗脱,用C18色谱柱分离,正离子模式扫描,多反应监测模式检测. 29种兽约在0.01 ~5.0 mg/L范围内线性关系良好,相关系数(r)均大于 0.99;在复合预混饲料、全价配合饲料、浓缩饲料中4个添加水平下29种兽药的平均回收率在61.2% ~94.3%范围内,相对标准偏差(RSD)为2.2%~15.0%;方法的检出限(以信噪比大于10计)为0.01 mg/kg或0.05 mg/kg.该方法简便、快速、准确,重现性好,灵敏度高,适用于配合饲料中多种兽药的同时检测.

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