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Analytical development for low molecular weight xenobiotic compounds

H H Maurer1, J W Arlt, T Kraemer

  • 1Department of Toxicology, University of Saarland, Homburg (Saar), Germany.

Archives of Toxicology. Supplement. = Archiv Fur Toxikologie. Supplement
|January 1, 1997
PubMed
Summary

Analytical toxicology challenges are met by gas chromatography-mass spectrometry (GC-MS) for low mass compounds and liquid chromatography-mass spectrometry (LC-MS) for non-volatiles, enabling precise xenobiotic detection and quantification in biosamples.

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Area of Science:

  • Analytical Chemistry
  • Toxicology
  • Mass Spectrometry

Background:

  • Detecting and quantifying xenobiotics in biological samples presents significant analytical challenges.
  • Gas Chromatography-Mass Spectrometry (GC-MS) is a highly sensitive and specific method for analyzing low-mass xenobiotics.
  • Liquid Chromatography-Mass Spectrometry (LC-MS) is essential for non-volatile compound analysis.

Purpose of the Study:

  • To outline and demonstrate effective GC-MS and LC-MS procedures for xenobiotic analysis in toxicology.
  • To address the specific challenges of detecting and quantifying diverse xenobiotics in various biosamples.

Main Methods:

  • Developed systematic toxicological analysis (STA) using GC-MS with acid hydrolysis, extraction, and acetylation for basic/neutral drugs.

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  • Established GC-MS procedures with extractive alkylation for acidic xenobiotics in urine.
  • Implemented electrospray LC-MS for non-volatile xenobiotics, including toxic peptides and phase II metabolites.

    • Main Results:

    • GC-MS, particularly with negative chemical ionization (NCI) and selected ion monitoring (SIM) using stable isotopes, provides sensitive and specific quantification.
    • Specific GC-MS protocols effectively identified and quantified acidic and basic/neutral xenobiotics in urine.
    • LC-MS proved effective for analyzing non-volatile compounds like alpha- and beta-amanitin.

    Conclusions:

    • GC-MS is the preferred method for analyzing low-mass xenobiotics in analytical toxicology.
    • LC-MS is the method of choice for the detection of non-volatile xenobiotics.
    • These validated methods enhance the precise detection and quantification of xenobiotics in biosamples.