Determination of ethyl sulfate in human serum and urine by capillary zone electrophoresis

Jung, Balthasar; Caslavska, Jitka; Thormann, Wolfgang (2008). Determination of ethyl sulfate in human serum and urine by capillary zone electrophoresis. Journal of chromatography A, 1206(1), pp. 26-32. Amsterdam: Elsevier Science 10.1016/j.chroma.2008.05.086

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The use of capillary zone electrophoresis (CZE) with indirect absorbance detection for the analysis of ethyl sulfate (EtS) in serum and urine was investigated. EtS is a direct metabolite of ethanol employed as marker for recent alcohol consumption. Fused-silica capillaries of 60 cm total length were either coated with cetyltrimethylammonium bromide (CTAB, 50 microm I.D. capillary) or poly(diallyldimethylammonium chloride) (PDADMAC, 100 microm I.D. capillary) to allow CZE analyses to be performed with reversed polarity. At pH 2.2 with a maleic acid/phthalic acid background electrolyte, both approaches provided reliable EtS serum levels down to 0.2 mg L(-1) (1.6 microM) for the analysis of solid-phase extracts that were prepared after chloride precipitation. Analysis of urines diluted to a conductivity of 5 S m(-1) and analyzed in the two capillary formats resulted in limits of quantification (LOQs) of 2 and 1 mg L(-1), respectively. With urines adjusted to 10 S m(-1) via dilution or condensation, an LOQ of 0.6 mg L(-1) (4.8 microM) was obtained in the CTAB coated capillary whereas in the PDADMAC-coated capillary of equal length not all matrix components were resolved from EtS. The developed assays are robust and suitable to monitor EtS in samples of individuals who consumed as little as one standard drink of an alcoholic beverage containing about 14 g of ethanol.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Service Sector > Institute of Clinical Pharmacology and Visceral Research [discontinued]
UniBE Contributor:	Jung, Balthasar, Thormann, Wolfgang
ISSN:	0021-9673
ISBN:	18571184
Publisher:	Elsevier Science
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 15:05
Last Modified:	05 Dec 2022 14:20
Publisher DOI:	10.1016/j.chroma.2008.05.086
PubMed ID:	18571184
Web of Science ID:	000260073800005
URI:	https://boris.unibe.ch/id/eprint/28336 (FactScience: 120150)