建立了超高效液相色谱-串联质谱(UPLC-MS/MS)测定化妆品中常见的6种抗生素(美满霉素、土霉素、四环素、金霉素、多西环素、氯霉素)及甲硝唑的方法,并用于实际样品的分析.样品经甲醇-0.1 mol/L甲酸溶液(体积比为1:1)超声提取后,以甲醇(含1%甲酸)-水(含1%甲酸)为流动相,经UPLC梯度洗脱分离后以多反应监测(MRM)模式质谱测定.方法的检出限为3～20 ng/g,回收率为87%～101%,工作曲线的线性相关系数大于0.995,线性范围为2～1 000μg/L(达3个数量级).对11份市售化妆品进行分析检测,其中2份检出氯霉素,质量分数分别为0.37%和0.19%;1份检出甲硝唑,质量分数为1.02%;美满霉素、土霉素、四环素、金霉素、多西环素未检出.
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