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Determinationof3-chloro-l-tyrosineasanovelindicatorofchlorinepoisoningutilizinggaschromatography-massspectrometricanalysis

气相色谱-质谱法测定氯气中毒新标志物-3-氯-l-酪氨酸

Abstract

Chlorinegasexposureoccursinchemicalwarfare,industrialandhouseholdaccidents.Inforensicscience,thegenerationofchlorinegasbymixingsodiumhypochloritedetergentandstrongaciddetergentcannotbeoverlookedbecauseofthepossibilityofsuicidemethod(NaClO+2HCl→NaCl+H2O+Cl2).Thoughtypicalautopsyfindingsareobtainedinchlorineexposure,suchaspulmonaryedema,usefulbiomarkersdon’texist.Inthisresearch,wedevelopedananalyticalmethodof3-chloro-l-tyrosine(Cl-Tyr)inbloodasanovelmarkerofchlorinepoisoningutilizinggaschromatography–massspectrometry(GC–MS).Cl-Tyrwaspurifiedusingproteinprecipitationandcation-exchangesolidphaseextraction,derivatizedbythesilylationagentandsubjectedtoGC–MS.Thequantificationrangewas10–ng/mLandgoodreproducibilitywasobtained.WeappliedthedevelopedmethodtoanalyzeCl-Tyrinautopsysample,whichissuspectedofchlorinepoisoning,anddetected59.7ng/mLCl-Tyrinleftheartblood.Toourknowledge,thisisthefirstreportofdeterminationofthechlorinatedbiomoleculeinthehumanautopsysamplefromchlorinepoisoning.

摘要

氯气暴露发生在化学战、工业和家庭事故中。在法庭科学中,考虑到自杀的愿意,次氯酸钠洗涤剂与强酸洗涤剂混合产生氯气的可能性不容忽视(NaClO+2HCl)→NaCl+H2O+Cl2)。虽然在氯气暴露下可以获得典型的尸检结果,如肺水肿,但有用的生物标志物并不存在。在本研究中,我们利用气相色谱-质谱(GC-MS)建立了血液中3-氯-l-酪氨酸(Cl-Tyr)的分析方法,作为氯气中毒的一种新的标志物。采用蛋白质沉淀和阳离子交换固相萃取法纯化Cl-Tyr,经硅烷化试剂衍生化并进行GC-MS分析,定量范围为10-ng/mL,重现性好。应用所建立的方法对疑似氯气中毒的尸检样品中的Cl-Tyr进行分析,检测出左心血中的Cl-Tyr含量为59.7ng/mL。据我们所知,这是首次检测氯气中毒人员尸检样品中的氯代生物分子。

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