Simultaneous and sensitive analysis of THC, 11-OH-THC, THC-COOH, CBD, and CBN by GC-MS in plasma after oral application of small doses of THC and cannabis extract.

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Serval ID
serval:BIB_722ED4C9EAAC
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Simultaneous and sensitive analysis of THC, 11-OH-THC, THC-COOH, CBD, and CBN by GC-MS in plasma after oral application of small doses of THC and cannabis extract.
Journal
Journal of analytical toxicology
Author(s)
Nadulski T., Sporkert F., Schnelle M., Stadelmann A.M., Roser P., Schefter T., Pragst F.
ISSN
0146-4760 (Print)
ISSN-L
0146-4760
Publication state
Published
Issued date
2005
Peer-reviewed
Oui
Volume
29
Number
8
Pages
782-789
Language
english
Notes
Publication types: Clinical Trial ; Journal Article
Publication Status: ppublish
Abstract
Besides the psychoactive Delta(9)-tetrahydrocannabinol (THC), hashish and marijuana as well as cannabis-based medicine extracts contain varying amounts of cannabidiol (CBD) and of the degradation product cannabinol (CBN). The additional determination of these compounds is interesting from forensic and medical points of view because it can be used for further proof of cannabis exposure and because CBD is known to modify the effects of THC. Therefore, a method for the simultaneous quantitative determination of THC, its metabolites 11-hydroxy-Delta(9)-tetrahydrocannabinol (11-OH-THC) and 11-nor-9-carboxy-Delta(9)-tetrahydrocannabinol (THC-COOH), CBD and CBN from plasma was developed. The method was based on automatic solid-phase extraction with C(18) ec columns, derivatization with N,O-bistrimethylsilyltrifluoroacetamide (BSTFA), and gas chromatography-electron impact ionization-mass spectrometry (GC-EI-MS) with deuterated standards. The limits of detection were between 0.15 and 0.29 ng/mL for THC, 11-OH-THC, THC-COOH, and CBD and 1.1 ng/mL for CBN. The method was applied in a prospective pharmacokinetic study after single oral administration of 10 mg THC alone or together with 5.4 mg CBD in cannabis extract. The maximum plasma concentrations after cannabis extract administration ranged between 1.2 and 10.3 ng/mL (mean 4.05 ng/mL) for THC, 1.8 and 12.3 ng/mL (mean 4.9 ng/mL) for 11-OH-THC, 19 and 71 ng/mL (mean 35 ng/mL) for THC-COOH, and 0.2 and 2.6 ng/mL (mean 0.95 ng/mg) for CBD. The peak concentrations (mean values) of THC, 11-OH-THC, THC-COOH, and CBD were observed at 56, 82, 115, and 60 min, respectively, after intake. CBN was not detected. Caused by the strong first-pass metabolism, the concentrations of the metabolites were increased during the first hours after drug administration when compared to literature data for smoking. Therefore, the concentration ratio 11-OH-THC/THC was discussed as a criterion for distinguishing oral from inhalative cannabis consumption.
Keywords
Administration, Oral, Adolescent, Adult, Cannabidiol/blood, Cannabinol/blood, Cannabis, Cross-Over Studies, Double-Blind Method, Dronabinol/analogs & derivatives, Dronabinol/blood, Gas Chromatography-Mass Spectrometry/methods, Humans, Middle Aged, Plant Extracts/pharmacokinetics, Prospective Studies
Pubmed
Web of science
Open Access
Yes
Create date
04/02/2008 15:08
Last modification date
25/09/2019 6:09
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