Volume 31, Issue 2 (April 1986)

    Confirmation of Syva Enzyme Multiple Immunoassay Technique (EMIT®) d.a.u. and Roche Abuscreen® Radioimmunoassay (RIA) (125I) Urine Cannabinoid Immunoassays by Gas Chromatographic/Mass Spectrometric (GC/MS) and Bonded-Phase Adsorption/Thin-Layer Chromatographic (BPA-TLC) Methods

    (Received 15 April 1985; accepted 9 August 1985)

    CODEN: JFSOAD

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    Abstract

    Thirty human urines screened positive by the Syva enzyme multiple immunoassay technique (EMIT®) d.a.u. urine cannabinoid assay were also positive for the major marijuana urinary metabolite 11-nor-Δ9-tetrahydrocannabinol-9-carboxylic acid (THC-COOH) when assayed by gas chromatographic/mass spectrometric (GC/MS) and a noninstrumental qualitative bonded-phase adsorption/thin-layer chromatographic (BPA-TLC) technique. The noninstrumental BPA-TLC procedure was the simpler of the two techniques to perform and interpret. Assay of these same samples by the Roche Abuscreen® radioimmunoassay (RIA) for cannabinoids (125I) revealed that reliance on the 100-ng/mL equivalent positive calibrator yielded a high incidence of false negative results (10 out of 30). The performance of these same 4 assays on 30 true negatives also was evaluated. All samples were negative for cannabinoids by EMIT and RIA, and for THC-COOH by BPA-TLC. GC/MS assay, however, detected spurious low levels of approximately S-ng/mL THC-COOH in two instances. Because of this, a reliability level of 10 ng/mL was set for the routine quantitative confirmation of THC-COOH by the GC/MS method.


    Author Information:

    Pierson, DJ
    Head, Chromatography Section, head, Immunoassay Section, and associate laboratory director, New York State Psychiatric Institute, Department of Neuropathology and Neurotoxicology, New York, NY

    Al Razi, J
    Head, Analytical Toxicology, Psychiatric Diagnostic Laboratories of America, Inc., South Plainfield, NJ

    Kogan, MJ
    Head, Chromatography Section, head, Immunoassay Section, and associate laboratory director, New York State Psychiatric Institute, Department of Neuropathology and Neurotoxicology, New York, NY

    Willson, NJ
    Head, Chromatography Section, head, Immunoassay Section, and associate laboratory director, New York State Psychiatric Institute, Department of Neuropathology and Neurotoxicology, New York, NY


    Stock #: JFS12280J

    ISSN: 0022-1198

    DOI: 10.1520/JFS12280J

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    Title Confirmation of Syva Enzyme Multiple Immunoassay Technique (EMIT®) d.a.u. and Roche Abuscreen® Radioimmunoassay (RIA) (125I) Urine Cannabinoid Immunoassays by Gas Chromatographic/Mass Spectrometric (GC/MS) and Bonded-Phase Adsorption/Thin-Layer Chromatographic (BPA-TLC) Methods
    Symposium , 0000-00-00
    Committee E30