a method for the assay of delta 1-tetrahydrocannabinol ( delta 1-thc ) in plasma using combined gas chromatography-mass spectrometry with metastable ion monitoring is described . delta 1-thc was extracted with hexane and the extracts were methylated with diazomethane to shift the peaks produced by endogenous plasma constituents away from the cannabinoid region .
C0039663
delta 1-thc
C0006864
cannabinoid