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  • Title: [Liquid chromatography-tandem mass spectrometry method for the determination of paraquat and diquat in plasma and urine].
    Author: Guo X, Li TD, Tian DC, Ma CH, Lin YR, Yun JP.
    Journal: Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi; 2021 Aug 20; 39(8):612-616. PubMed ID: 34488273.
    Abstract:
    Objective: To establish a LC-MS/MS method for determination of paraquat and diquat in plasma and urine samples. Methods: Plasma is precipitated by acetonitrile then diluent with phosphate buffer (pH=7) , urine is diluent with phosphate buffer (pH=7) , then diluent samples extracted with Oasis WCX solid-phase extraction column. Samples were analyzed using LC-MS/MS in multiple reaction monitoring (MRM) mode. The analytical column was XBridge®BEH-HILIC (100 mm×2.1 mm×2.5 μm) and the mobile phase were 100 mmol ammonium formate add 0.5% formic acid and acetonitrile. Paraquat was quantified by internal standard method and diquat by external standard method. Results: The calibration curves of paraquat and diquat were linear in the concentration range of 10.0~120.0 μg/L, the correlation coefficient (r) were 0.9985~0.9994. The limit of detection of paraquat in plasma and urine were 1.98 μg/L and 1.00 μg/L, respectively, the recovery rate were 100.2%~107.3%, the RSD were 1.6%~3.3%. The limit of detection of diquat in plasma and urine were 1.80 μg/L and 2.77 μg/L, respectively, the recovery rate were 85.3%~93.1%, the RSD were 1.8%~5.5%. Conclusion: This method is sensitive and accurate, and can simultaneously determine paraquat and diquat in plasma and urine. 目的： 建立血浆和尿液中百草枯和敌草快的液相色谱-串联质谱（LC-MS/MS）检测方法。 方法： 血浆经乙腈沉淀蛋白磷酸盐缓冲液（pH=7）稀释，尿样用磷酸盐缓冲液（pH=7）直接稀释，稀释后的样品经Oasis WCX固相萃取柱萃取。以100 mmol/L甲酸铵+0.5%甲酸水溶液和乙腈为流动相，经HILIC色谱柱分离，LC-MS/MS多反应监测模式检测，百草枯内标法定量，敌草快外标法定量。 结果： 百草枯和敌草快同在10.0~120.0 μg/L质量浓度范围内线性良好，相关系数为0.998 5~0.999 4。百草枯在血浆和尿液中最低检出限分别为1.98 μg/L和1.00 μg/L，样品加标回收率在100.2%~107.3%，相对标准偏差在1.6%~3.3%。敌草快在血浆和尿液中最低检出限分别为1.80 μg/L和2.77 μg/L，样品加标回收率在85.3%~93.1%，相对标准偏差在1.8%~5.5%。 结论： 本方法灵敏准确，能够对血浆和尿液中的百草枯和敌草快同时进行测定。.
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