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  • Title: Development and validation of a method for the quantitation of Delta9 tetrahydrocannabinol in human plasma by high performance liquid chromatography after solid-phase extraction.
    Author: Abbara C, Galy R, Benyamina A, Reynaud M, Bonhomme-Faivre L.
    Journal: J Pharm Biomed Anal; 2006 Jun 07; 41(3):1011-6. PubMed ID: 16500063.
    Abstract:
    A high performance liquid chromatography (HPLC) procedure for the determination of Delta9 tetrahydrocannabinol (THC) in human plasma is described. A two-step solid-phase extraction on CN cartridges was coupled with a reversed phase HPLC system. THC was eluted using a mobile phase composed of methanol, acetonitrile and tetrabutylammonium perchlorate solution (0.005 M, pH 3.2), through a C18 Nucleosil column and detected at a wavelength of 215 nm. Calibration curve was linear over the range 5-100 ng/ml with a lower limit of quantification validated at 5 ng/ml. Extraction recovery using the developed extraction procedure was higher than 85%. This method is presently used for the quantification of THC in plasma samples from regular cannabis smokers.
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