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Erschienen in: Forensic Toxicology 1/2023

06.07.2022 | Original Article

Analysis of degradation products of nerve agents in biological fluids by ion chromatography–tandem mass spectrometry

verfasst von: Mai Otsuka, Hajime Miyaguchi

Erschienen in: Forensic Toxicology | Ausgabe 1/2023

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Abstract

Purpose

The detection of hydrolysis products of nerve agents (alkyl methylphosphonic acids; RMPAs) in biological samples from victims is important to confirm exposure to nerve agents. However, analysis of RMPAs is difficult due to their high hydrophilicity. The aim of this study was to develop ion chromatography–tandem mass spectrometry (IC–MS/MS) methods using commercially available equipment and columns to analyze RMPAs in human urine and serum with high sensitivity and without using complicate techniques.

Methods

A Dionex IonPac AS11-HC anion-exchange column was used to analyze six RMPAs (MPA, EMPA, IMPA, iBuMPA, CHMPA, and PMPA). For pretreatments of biological fluids, we developed two pretreatment methods (Method 1: dilution and ultrafiltration; Method 2: removal of chloride ions with Ag cartridges).

Results

Six RMPAs including highly hydrophilic methylphosphonic acid and ethyl methylphosphonic acid could be analyzed with sufficient retention times and peak shape. The detection limits of RMPAs were improved using Dionex OnGuard II Ba/Ag/H cartridges and MetaSEP IC–Ag cartridges (urine: 0.5–5 ng/mL; serum: 1–5 ng/mL). These methods were also applied to the test samples for the Organisation for the Prohibition of Chemical Weapons Biomedical Proficiency Tests.

Conclusions

RMPAs could be sufficiently analyzed by IC–MS/MS. In addition, the limits of detection were superior to those obtained in our previous study involving LC–MS/MS or derivatization–LC–MS/MS method. For analysis of biological samples, an appropriate pretreatment method can be chosen according to the amount of sample available for analysis and expected RMPA concentrations.
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Metadaten
Titel
Analysis of degradation products of nerve agents in biological fluids by ion chromatography–tandem mass spectrometry
verfasst von
Mai Otsuka
Hajime Miyaguchi
Publikationsdatum
06.07.2022
Verlag
Springer Nature Singapore
Erschienen in
Forensic Toxicology / Ausgabe 1/2023
Print ISSN: 1860-8965
Elektronische ISSN: 1860-8973
DOI
https://doi.org/10.1007/s11419-022-00633-x

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