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Solid-phase extraction, identification, and quantitation of 11-nor-delta-9-tetrahydrocannabinol-9-carboxylic acid
G R Nakamura1, R D Meeks, W J Stall
1U.S. Army Criminal Investigation Laboratory-Pacific, APO San Francisco, CA.
Journal of Forensic Sciences
|July 1, 1990
Abstract:
A procedure has been developed to extract and recover minute amounts of delta-9-carboxytetrahydrocannabinol (THC-COOH) from urine. A new non-isotopic internal standard is introduced to permit a chromatographic assay of the metabolite. The method affords a 91% recovery of 20 ng/mL of the THC-COOH acid from spiked urine with the assurance of a 3.8% coefficient of variation.