Abstract
A simple, sensitive and selective method is described for the simultaneous determination of low concentrations (less than 50 ng/ml) of underivatized methohexital and its hydroxy metabolite in small (0.1 ml) samples of human and rat plasma or whole blood by gas chromatography with nitrogen-selective detection. Moreover, the main metabolite in rat and man was identified as 4′-hydroxymethohexital by comparison of chromatograms from gas—liquid chromatography (GLC) with data obtained from GLC—mass spectrometry and 1H-nuclear magnetic resonance spectrometry of this metabolite, produced both by incubating methohexital with isolated rat liver microsomes and by isolating this metabolite from rat urine.
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