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Simultaneous determination of Δ9-tetrahydrocannabinol and 11-nor-9-carboxy-Δ9-tetrahydrocannabinol in oral fluid using isotope dilution liquid chromatography tandem mass spectrometry

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Abstract

The detection and confirmation of cannabinoids in oral fluid are important in forensic toxicology. Currently, the presence of Δ9-tetrahydrocannabinol (THC) is used for the detection of cannabis in oral fluid. A low concentration of 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THC-COOH) is found in oral fluid, which suggested a convenient and low-sensitivity confirmation assay can be used in a routine forensic laboratory. In this study, a highly sensitive isotope dilution liquid chromatography–tandem mass spectrometry method following dansylation was successfully developed for simultaneous determination of THC and THC-COOH in oral fluid. The dansylated derivatives dramatically demonstrated and enhanced the sensitivity of THC and THC-COOH. To avoid signal influenced by the matrix, a 5-min liquid chromatography gradient program was evaluated and optimized, which reduced the sample diffusion and caused sharp peaks (less than 12 s) and thus helped to achieve detection at a low level. The sensitivity, accuracy, and precision were also evaluated, and high quantitative accuracy and precision were obtained. The limit of quantitation of this approach was 25 pg/mL for THC and 10 pg/mL for THC-COOH in oral fluid. Finally, the method was successfully applied to eight suspected cannabis users. Among them, in six oral fluid samples THC-COOH was determined at a concentration from 13.1 to 47.2 pg/mL.

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Acknowledgements

The authors would like to thank the Food and Drug Administration, Department of Health, Republic of China, and the National Science Council of the Republic of China, Taiwan, for financial support of this research (NSC 98-2113-M-040 -002).

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Authors and Affiliations

  1. Institute of Medical and Molecular Toxicology, Chung Shan Medical University, Taichung, 402, Taiwan

    Pin Duo Lee, Yuan-Jhe Chang & Yan-Zin Chang

  2. School of Medical Laboratory and Biotechnology, Chung Shan Medical University, Taichung, 402, Taiwan

    Keh-Liang Lin

  3. Drug Testing Center, Department of Clinical Laboratory, Chung Shan Medical University Hospital, Taichung, 403, Taiwan

    Yan-Zin Chang

  4. Institute of Medicine, Chung Shan Medical University, Taichung, 402, Taiwan

    Yan-Zin Chang

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  1. Pin Duo Lee
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  2. Yuan-Jhe Chang
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Correspondence to Yan-Zin Chang.

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Lee, P.D., Chang, YJ., Lin, KL. et al. Simultaneous determination of Δ9-tetrahydrocannabinol and 11-nor-9-carboxy-Δ9-tetrahydrocannabinol in oral fluid using isotope dilution liquid chromatography tandem mass spectrometry. Anal Bioanal Chem 402, 851–859 (2012). https://doi.org/10.1007/s00216-011-5439-8

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  • DOI: https://doi.org/10.1007/s00216-011-5439-8

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