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Schermann JM, Hoellinger H, Bourdon R, Fournier E. Methodology for the detection and quantitation of delta9-tetrahydrocannabinol in plasma by dansylation and double labelling. Clin Chim Acta 1977; 79:401-9. [PMID: 19182 DOI: 10.1016/0009-8981(77)90436-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Agurell S, Gustafsson B, Holmstedt B, Leander K, Lindgren JE, Nilsson I, Sandberg F, Asberg M. Quantitation of 1-tetrahydrocannabinol in plasma from cannabis smokers. J Pharm Pharmacol 1973; 25:554-8. [PMID: 4147053 DOI: 10.1111/j.2042-7158.1973.tb09156.x] [Citation(s) in RCA: 78] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Abstract
A method to identify and accurately measure non-labelled Δ1-tetrahydrocannabinol (Δ1-THC) in blood of cannabis smokers has been developed. It consists of the following steps: To a 5 ml plasma sample is added deuterated Δ1-THC (Δ1-THC-d2) as internal standard. After extraction with light petroleum and evaporation, the Δ1-THC containing fraction is separated by chromatography on Sephadex LH-20 (1 times 40 cm) using light petroleum-chloroform-ethanol (10:10:1) as eluant. A fraction containing Δ1-THC is collected and subjected to mass fragmentography (LKB 9000; 3% OV-17/Gas-Chrom Q; 230°). The mass spectrometer was adjusted to record the intensities of m/e 299 and 314 of Δ1-THC and m/e 301 and 316 of Δ1-THC-d2. The standard curve was made by plotting peak height m/e 299/m/e 301. Peak levels of 19–26 ng ml−1 were reached within 10 min after smoking a cigarette containing 10 mg Δ1-THC.
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