建立了高效液相色谱-共振瑞利散射光谱联用测定大鼠血清中奈替米星的方法.采用的色谱条件为:以C18柱为分离柱,以甲醇(含0.22%三氟乙酸)-20 mmol/L醋酸钠水溶液(8∶92,v/v)为流动相进行等度洗脱.以滂胺天蓝为分子探针,奈替米星在柱后与滂胺天蓝结合生成离子缔合物,产生强烈的共振瑞利散射信号,荧光检测器在激发波长(λex)和发射波长(λem)均为365 nm下进行检测.在优化的检测条件下,奈替米星的检出限(信噪比为3)为0.7 mg/L.以妥布霉素为内标物,以内标法定量,奈替米星与妥布霉素的峰面积比与奈替米星的质量浓度之间的线性响应范围为1.2～30 mg/L.该方法可应用于大鼠血清中奈替米星的药代动力学研究,可为生物样品中氨基糖苷类抗生素的测定提供一种新的选择.
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