Abstract
欧洲鸡蛋污染事件爆发后,氟虫腈及其代谢物氟甲腈、氟虫腈砜和氟虫腈亚砜残留受到人们较多关注。该研究通过优化前处理方法和色谱条件,建立了畜禽肝脏中氟虫腈及其代谢物的高效液相色谱-串联质谱测定分析方法。样品经10 mL乙腈提取,150 mg PSA、100 mg C18填料净化后,将提取液直接进样分析,以乙腈和水为流动相进行梯度洗脱,在Agilent ZORBAX SB-C18色谱柱(150 mm×2.1 mm, 3.5 μm)上进行色谱分离,采用电喷雾离子源,负离子扫描,多反应监测(MRM)模式测定,基质校正曲线,外标法定量。结果表明,氟虫腈及其代谢物在0.1~10 μg/L范围内线性关系良好,相关系数(r2)均大于0.995,方法的检出限和定量限分别为0.2 μg/kg和0.5 μg/kg。在0.5、1.0、10.0 μg/kg 3个加标水平下,氟虫腈及其代谢物的平均回收率为81.1%~99.8%,相对标准偏差(RSD)为6.1%~11.7%。应用建立的方法对99份畜禽肝脏样品进行检测,在4份样品中检测出氟虫腈砜,测定值为1.25~2.82 μg/kg。该方法简单,灵敏度和准确度高,适用于大批量畜禽肝脏样品中氟虫腈及其代谢物残留的日常测定。
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