An Enhanced Butyrylcholinesterase Method to Measure Organophosphorus Nerve Agent Exposure in Humans
Published Date:Mar 07 2014
Source:Anal Bioanal Chem. 406(21):5187-5194.
Chemical Warfare Agents
In Vitro Techniques
Organophosphorus Nerve Agent
Tandem Mass Spectrometry
Pubmed Central ID:PMC4836380
Funding:CC999999/Intramural CDC HHS/United States
Description:Organophosphorus nerve agent (OPNA) adducts to butyrylcholinesterase (BChE) can be used to confirm exposure in humans. A highly accurate method to detect G- and V-series OPNA adducts to BChE in 75 μL of filtered blood, serum, or plasma has been developed using immunomagnetic separation (IMS) coupled with liquid chromatography tandem mass spectrometry (LC-MS/MS). The reported IMS method captures > 88 % of the BChE in a specimen and corrects for matrix effects on peptide calibrators. The optimized method has been used to quantify baseline BChE levels (unadducted and OPNA-adducted) in a matched-set of serum, plasma, and whole blood (later processed in-house for plasma content) from 192 unexposed individuals to determine the interchangeability of the tested matrices. The results of these measurements demonstrate the ability to accurately measure BChE regardless of the format of the blood specimen received. Criteria for accepting or denying specimens were established through a series of sample stability and processing experiments. The results of these efforts are an optimized and rugged method that is transferrable to other laboratories and an increased understanding of the BChE biomarker in matrix.
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