Analytical and Bioanalytical Chemistry

, Volume 408, Issue 3, pp 825–838

Quantification of phosphatidylethanol 16:0/18:1, 18:1/18:1, and 16:0/16:0 in venous blood and venous and capillary dried blood spots from patients in alcohol withdrawal and control volunteers

  • Natalie Kummer
  • Ann-Sofie Ingels
  • Sarah M. R. Wille
  • Catherine Hanak
  • Paul Verbanck
  • Willy E. E. Lambert
  • Nele Samyn
  • Christophe P. Stove
Research Paper

Abstract

Phosphatidylethanol species (PEths) are promising biomarkers of alcohol consumption. Here, we report on the set-up, validation, and application of a novel UHPLC-ESI-MS/MS method for the quantification of PEth 16:0/18:1, PEth 18:1/18:1, and PEth 16:0/16:0 in whole blood (30 μL) and in venous (V, 30 μL) or capillary (C, 3 punches (3 mm)) dried blood spots (DBS). The methods were linear from 10 (LLOQ) to 2000 ng/mL for PEth 16:0/18:1, from 10 (LLOQ) to 1940 ng/mL for PEth 18:1/18:1, and from 19 (LLOQ) to 3872 ng/mL for PEth 16:0/16:0. Extraction efficiencies were higher than 55 % (RSD < 18 %) and matrix effects compensated for by IS were between 77 and 125 % (RSD < 10 %). Accuracy, repeatability, and intermediate precision fulfilled acceptance criteria (bias and RSD below 13 %). Validity of the procedure for determination of PEth 16:0/18:1 in blood was demonstrated by the successful participation in a proficiency test. The quantification of PEths in C-DBS was not significantly influenced by the hematocrit, punch localization, or spot volume. The stability of PEths in V-DBS stored at room temperature was demonstrated up to 6 months. The method was applied to authentic samples (whole blood, V-DBS, and C-DBS) from 50 inpatients in alcohol withdrawal and 50 control volunteers. Applying a cut-off value to detect inpatients at 221 ng/mL for PEth 16:0/18:1 provided no false positive results and a good sensitivity (86 %). Comparison of quantitative results (Bland-Altman plot, Passing-Bablok regression, and Wilcoxon signed rank test) revealed that V-DBS and C-DBS were valid alternatives to venous blood for the detection of alcohol consumption.

Graphical Abstract

Passing-Bablok regression analysis of PEth 16:0/18:1 concentrations measured in blood and in capillary DBS, demonstrating equivalence of PEth concentrations in both matrices

Keywords

Biological samples Drug monitoring/drug screening Forensics/toxicology Sampling 

Supplementary material

216_2015_9169_MOESM1_ESM.pdf (1 mb)
ESM 1(PDF 1.01 mb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Natalie Kummer
    • 1
  • Ann-Sofie Ingels
    • 1
  • Sarah M. R. Wille
    • 1
  • Catherine Hanak
    • 2
  • Paul Verbanck
    • 2
  • Willy E. E. Lambert
    • 3
  • Nele Samyn
    • 1
  • Christophe P. Stove
    • 3
  1. 1.Federal Public Service JusticeNational Institute of Criminalistics and CriminologyBrusselsBelgium
  2. 2.Laboratory of Psychological Medicine and Addictology, ULB Neuroscience Institute (UNI)Université Libre de Bruxelles (ULB)BrusselsBelgium
  3. 3.Laboratory of Toxicology, Faculty of Pharmaceutical SciencesGhent UniversityGhentBelgium

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