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Ionic Liquid-Based Liquid-Liquid Microextraction for Benzodiazepine Analysis in Postmortem Blood Samples.

Marieke De Boeck1, Wim Dehaen2, Jan Tytgat1

  • 1Toxicology and Pharmacology, Department of Pharmaceutical and Pharmacological Sciences, University of Leuven (KU Leuven), Campus Gasthuisberg O&N II, P.O. Box 922, Herestraat 49, 3000, Leuven, Belgium.

Journal of Forensic Sciences
|March 25, 2018
PubMed
Summary
This summary is machine-generated.

Ionic liquid-based dispersive liquid-liquid microextraction (IL-DLLME) shows promise for analyzing benzodiazepines in postmortem blood. While generally comparable to solid-phase extraction, matrix variability requires further investigation for specific compounds.

Keywords:
Bland-AltmanLC-MS/MSforensic scienceforensic toxicologyionic liquid-based liquid-liquid microextractionpostmortem cases

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Area of Science:

  • Forensic Toxicology
  • Analytical Chemistry
  • Sample Preparation Techniques

Background:

  • Advancements in sample preparation seek faster, greener methods.
  • Ionic liquid-based dispersive liquid-liquid microextraction (IL-DLLME) is a promising technique.
  • IL-DLLME has not been previously assessed for postmortem sample analysis.

Purpose of the Study:

  • To evaluate the applicability of IL-DLLME coupled with LC-MS/MS for benzodiazepine analysis in postmortem blood.
  • To compare the IL-DLLME method with a validated solid-phase extraction (SPE) method.

Main Methods:

  • Ionic liquid-based dispersive liquid-liquid microextraction (IL-DLLME).
  • Liquid chromatography-tandem mass spectrometry (LC-MS/MS).
  • Comparison with validated solid-phase extraction (SPE) and Bland-Altman analysis.

Main Results:

  • IL-DLLME coupled with LC-MS/MS demonstrated usability for postmortem blood analysis.
  • Results were comparable to SPE, with notable exceptions for flurazepam and temazepam (>55% difference).
  • Potential reasons for discrepancies include postmortem matrix variability and the use of a single nondeuterated internal standard.

Conclusions:

  • IL-DLLME is a viable technique for benzodiazepine analysis in postmortem blood.
  • Further research is needed to address matrix effects and optimize internal standardization for challenging compounds.
  • The method offers a potentially faster and more environmentally friendly alternative for forensic toxicology.