Abstract

人体体液中有机磷酸酯(OPEs)浓度的测定对于了解人体OPEs的暴露水平以及评估人体健康风险具有重要意义。然而,目前的研究大多数集中于尿液中OPEs代谢物含量的分析测定,将其作为人体OPEs暴露的生物标志物,而对人体血液中OPEs的分析研究较少,仅有的少量研究涉及的OPEs种类有限。该研究在优化前处理过程(固相萃取,SPE)和色谱分离的基础上,建立了人体血液中16种OPEs的超高效液相色谱-串联质谱(UPLC-MS-MS)测定方法。血液样品经过乙腈摇床萃取后,经ENVI-18 SPE小柱净化,然后采用Acquity UPLC BEH C18色谱柱,以甲醇/5 mmol/L的乙酸铵水溶液为流动相进行梯度洗脱对目标物进行分离,最后进行LC-MS/MS测定。质谱分析采用电喷雾正离子模式电离,多重反应监测模式测定,内标法定量。在优化的检测条件下,16种OPEs的检出限为0.0038~0.882 ng/mL。除磷酸三甲酯(TMP)外,其余15种OPEs在3个浓度水平的血液基质加标回收率为53.1%~126%,相对标准偏差为0.15%~12.6%。样品的基质效应检测发现,4种OPEs存在明显的基质抑制,选用合适的同位素内标进行定量,可以部分消除基质影响。该方法样品前处理简单,灵敏度高,适用于人体血液样品中OPEs阻燃剂的测定。15个人体血液样本分析结果表明,OPEs的总浓度范围为1.50~7.99 ng/mL,其中8种OPEs的检出率均高于50%,磷酸三异丁酯(TiBP)、磷酸三(2-氯乙基)酯(TCEP)和磷酸三(1-氯-2-丙基)磷酸酯(TCIPP)为主要的OPEs,表明人体存在较为普遍的OPEs暴露,应该引起关注。

Highlights

  • Human blood is a matrix that is in contact with all body organs and tissues, and the blood lev⁃ els of compounds may better represent the doses that reach target tissues

  • A method based on liquid chromatography⁃tandem mass spectrometry ( LC⁃MS / MS) was developed for the simultaneous determination of 16 OPEs in human blood, and the extraction efficiency of the solid phase extraction ( SPE) column for OPEs was verified

  • The OPEs were analyzed by high performance liquid chromatography⁃tandem mass spectrometry

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Summary

Introduction

Human blood is a matrix that is in contact with all body organs and tissues, and the blood lev⁃ els of compounds may better represent the doses that reach target tissues. Only a few studies have investigated the occurrence of OPEs in human blood by different analytical methods, and the variety of OPEs considered is limited.

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