GC-MS-MS determination of gamma-hydroxybutyrate in blood and urine

Richard Paul*, Lolita Tsanaclis, Robert Kingston, Anthony Berry, Alan Guwy

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)


    A gas chromatographic-tandem mass spectrometric (GC-MS-MS) method for determining trace concentrations of gamma-hydroxybutyrate (GHB) in blood and urine has been developed. Multiple reaction monitoring was used to detect parent and daughter ions of GHB, 233 and 147, respectively, following liquid-liquid extraction with acetonitrile and derivatisation with N,O-bis[trimethylsilyl] trifluoroacetamide (BSTFA). Deuterated GHB was used as an internal standard. The assay produced excellent linearity and sensitivity without conversion to gamma butyrolactone. The lower limit of quantitation (LLOQ) in 50 μL of sample was 2.5 μg/mL. The expanded uncertainty values for intra- and interassay results were ± 0.097 and ± 0.123 ng/mL at a confidence level of 95% for blood and urine, respectively. Endogenous concentrations of GHB were found to be in the range of 0.3 to 6 μg/mL in urine and 0.5 to 2.3 μg/mL in blood, confirming previously suggested cut-off values for forensic analysis.

    Original languageEnglish
    Pages (from-to)375-379
    Number of pages5
    JournalJournal of Analytical Toxicology
    Issue number6
    Publication statusPublished - 2006


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