Abstract
The vesicant sulfur mustard (SM) is a banned chemical warfare agent that is controlled by the Organisation for the Prohibition of Chemical Weapons (OPCW). Bioanalytical procedures are mandatory for proving an alleged use and incorporation of SM into the body. We herein present the development and application of a novel optimized procedure suitable for qualitative verification analysis of plasma targeting the SM-adduct of human serum albumin (HSA) alkylated at the cysteine(34) residue. Diluted human plasma is directly mixed with pronase in an ultrafiltration device (10 kDa cut-off) for proteolysis (4 h, 37 degrees C). Following ultrafiltration the filtrate is diluted and analyzed by microbore liquid chromatography-electrospray ionization high resolution tandem-mass spectrometry (mu LC-ESI HR MS/MS) targeting the alkylated dipeptide hydroxyethylthioethyl-CysPro (HETE-CP). A hybrid quadrupole time-of-flight mass spectrometer provided high mass spectrometric resolution in the MS/MS mode enabling highest selectivity and sensitivity (lower limit of detection corresponding to 9.8 nM SM in plasma). Kinetics of HETE-CP formation from heparin-, citrate-, and EDTA-plasma as well as serum are presented and the influence of different EDTA and pronase concentrations was characterized. The novel procedure was applied to plasma samples provided by the OPCW as well as to patients' plasma derived from real cases of SM-poisoning. (C) 2015 ELSEVIER. All rights reserved.
Item Type: | Journal article |
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Faculties: | Chemistry and Pharmacy > Department of Chemistry |
Subjects: | 500 Science > 540 Chemistry |
ISSN: | 0378-4274 |
Language: | English |
Item ID: | 48282 |
Date Deposited: | 27. Apr 2018, 08:15 |
Last Modified: | 04. Nov 2020, 13:25 |