Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1073, Issue 1-2, Pages 355-361Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2004.10.052
Keywords
solid-phase extraction protocol; polymeric strong cation exchange sorbent; LC-MS; GC-MS
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A novel solid-phase extraction (SPE) method was developed for extraction and cleanup of 11-nor-9-carboxy-Delta(9)-tetrahydrocannabinol (THC-COOH), the major metabolite of the active principle of marijuana, Delta(9)-tetrahydrocannabinol, from urine samples. The protocol utilizes a polymeric mixed-mode cationic sorbent, Strata-X-C, which exhibits strong retention for the metabolite facilitating a more rigorous organic wash to eliminate matrix components/endogenous materials. Acetonitrile containing acetic acid was used as the elution solvent and is compatible with both LC-MS and GC-MS modes of analysis. The hydrophobic retention of Strata-X-C was demonstrated to be higher than a neutral polymeric sorbent, Strata-X, of the same backbone but devoid of the cation-exchange moiety (sulfonic acid), by LC studies employing homologous paraben probes. Simultaneously, the polar (non-ionic) interaction capability of Strata-X-C is also greater than that of Strata-X, as assessed through regioisomeric nitrophenol probes. These two features enable the metabolite to be retained strongly on Strata-X-C. Good linearity and precision was obtained for THC-COOH by GC-MS analysis of its trimethylsilyl derivative in the range 1-50 ng. A simplified room temperature instantaneous derivatization procedure was developed that is suitable for high-throughput screening of THC-COOH. (c) 2004 Elsevier B.V. All rights reserved.
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