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J Anal Toxicol. 1990 Jan-Feb;14(1):39-44.

Pretreatment of urine samples for the analysis of 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid using solid-phase extraction.

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1
Supelco, Inc., Bellefonte, PA 16823.

Abstract

An extraction and concentration procedure using a unique solid-phase extraction tube was developed for the analysis of 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid in urine. Absolute and relative recoveries of the drug metabolite were found to be greater than 85% and 92%, respectively. The extraction procedure allows quantitation of the drug metabolite by GC/MS, HPLC with UV detection, or GC with flame ionization detection. The extraction procedure was verified with urine samples obtained from marijuana users as well as spiked urine samples.

PMID:
2156110
[Indexed for MEDLINE]
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