Identification of di- and tri-substituted hydroxy and ketone metabolites of Δ1-tetrahydrocannabinol in mouse liver

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Abstract
In vivo liver metabolites of Δ1-tetrahydrocannabinol (Δ1-THC) were examined with a gas chromatograph—mass spectrometer—computer system as trimethylsilyl (TMS), [2H9]TMS and methyloxime-TMS derivatives. In addition to the reported monohydroxy, acid, and hydroxyacid metabolites, the following multiply substituted metabolites were identified: 2“,7-, 3”,7-, and 6β,7-dihydroxy-Δ1-THC; 2“,6α,7-, and 3”,6α,7-trihydroxy-Δ1-THC; 2“-, 3”-, and 7-hydroxy-6-oxo-Δ1-THC, and 2“,7- and 3”,7-dihydroxy-6-oxo-Δ1-THC. The ketones and hydroxyacids were reduced to common alcohols with lithium aluminium deuteride and the number of deuterium atoms in the product was used to distinguish the metabolic alcohols from those produced by reduction.