Identification of 48 homologues of phosphatidylethanol in blood by LC-ESI-MS/MS

Gnann, H; Engelmann, C; Skopp, G; Winkler, M; Auwärter, V; Dresen, S; Ferreirós, N; Wurst, F M; Weinmann, W (2010). Identification of 48 homologues of phosphatidylethanol in blood by LC-ESI-MS/MS. Analytical and bioanalytical chemistry, 396(7), pp. 2415-23. Heidelberg: Springer 10.1007/s00216-010-3458-5

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Phosphatidylethanol (PEth) is an abnormal phospholipid carrying two fatty acid chains. It is only formed in the presence of ethanol via the action of phospholipase D (PLD). Its use as a biomarker for alcohol consumption is currently under investigation. Previous methods for the analysis of PEth included high-performance liquid chromatography (HPLC) coupled to an evaporative light scattering detector (ELSD), which is unspecific for the different homologues--improved methods are now based on time of flight mass spectrometry (TOF-MS) and tandem mass spectrometry (MS/MS). The intention of this work was to identify as many homologues of PEth as possible. A screening procedure using multiple-reaction monitoring (MRM) for the identified homologues has subsequently been established. For our investigations, autopsy blood samples collected from heavy drinkers were used. Phosphatidylpropanol 16:0/18:1 (internal standard) was added to the blood samples prior to liquid-liquid extraction using borate buffer (pH 9), 2-propanol and n-hexane. After evaporation, the samples were redissolved in the mobile phase and injected into the LC-MS/MS system. Compounds were separated on a Luna Phenyl Hexyl column (50 mm x 2 mm, 3 microm) by gradient elution, using 2 mM ammonium acetate and methanol/acetone (95/5; v/v). A total of 48 homologues of PEth could be identified by using precursor ion and enhanced product ion scans (EPI).

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute of Legal Medicine > Forensic Chemistry and Toxicology

UniBE Contributor:

Weinmann, Wolfgang

ISSN:

1618-2642

Publisher:

Springer

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:11

Last Modified:

04 May 2014 23:05

Publisher DOI:

10.1007/s00216-010-3458-5

PubMed ID:

20127079

Web of Science ID:

000275752600005

URI:

https://boris.unibe.ch/id/eprint/1753 (FactScience: 203704)

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