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  • Title: Confirmation of EMIT cannabinoid assay results by bonded phase adsorption with thin layer chromatography.
    Author: Willson NJ, Kogan MJ, Pierson DJ, Newman E.
    Journal: J Toxicol Clin Toxicol; 1983 Jul; 20(5):465-73. PubMed ID: 6366244.
    Abstract:
    Clinical urine specimens were screened for the presence of cannabinoids using the EMIT Cannabinoid Assay. Aliquots of these samples were also analyzed for 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid (THCA), the major cannabis metabolite in urine, by a technique which combines bonded phase adsorption (BPA) and thin layer chromatography (TLC). A 100% agreement between EMIT and BPA-TLC results was observed when at least 20 mL of urine was assayed by BPA-TLC. Bonded phase adsorption coupled with thin layer chromatography appears to be a suitable technique for the confirmation of positive EMIT Cannabinoid Assay results.
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