The partitioning ofΔ 1-tetrahydrocannabinol into erythrocyte membranes in vivo and its effect on membrane fluidity1into erythrocyte membranes in vivo and its effect on membrane fluidity1

Abstract
Δ 1-Tetrahydrocannabinol (Δ 1-THC) has been quantified directly in erythrocyte membranes from drug-treated mice using gas chromatography/mass spectrometry. Concentrations of approximately 6 ngΔ 1-THC/mg membrane protein (10−5 M) were found when effects of the drug on behavior were prevalent. At these concentrations the drug produced a decrease in membrane order as measured by ESR.