title: A rapid sample-preparation technique for thin-layer chromatographic analysis for 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid in human urine.
abstract: In this rapid TLC method of analysis for the urinary cannabinoid metabolite, 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid (THC-COOH), hydrolyzed urine specimens are aspirated through a porous, alkyl-silica extraction layer located along the lower edge of a biphasic thin-layer chromatogram; THC-COOH is simultaneously extracted from the sample and concentrated on the TLC plate for subsequent migration and detection. The method, evaluated in a blind study, identified all samples containing THC-COOH greater than or equal to 20 micrograms/L. The technique increases samples throughput, sensitivity, and specificity as compared with conventional TLC methods and is applicable to a wide variety of compounds.
authors.affiliation: Analytical Systems, Division of Marion Laboratories, Inc., Irvine, CA 92718.
authors.forename: D L
authors.initials: DL
authors.lastname: King
authors.forename: M J
authors.initials: MJ
authors.lastname: Gabor
authors.forename: P A
authors.initials: PA
authors.lastname: Martel
authors.forename: C M
authors.initials: CM
authors.lastname: O'Donnell
mesh_terms: D002855:Chromatography, Thin Layer / Q000295:instrumentation / Q000379:methods*; D013759:Dronabinol / Q000031:analogs & derivatives* / Q000652:urine; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans
chemical_list: C016780:11-nor-delta(9)-tetrahydrocannabinol-9-carboxylic acid; D013759:Dronabinol