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Improved gas chromatography–negative ion chemical ionization tandem mass spectrometric method for determination of 11-nor-Δ9-tetrahydrocannabinol-9-carboxylic acid in hair using mechanical pulverization and bead-assisted liquid–liquid extraction

Bead-assisted Liquid–liquid Extraction11-Nor-δ9-tetrahydrocannabinol-9-carboxylic AcidBiochemistryGas ChromatographyMedicineMass SpectrometryMechanical PulverizationAnalytical ChemistryLiquid ChromatographyChromatographic AnalysisPharmacologyChromatographyDrug Analysis