Determination of 11-nor-Δ9-tetrahydrocannabinol-9-carboxylic acid in urine using high-performance liquid chromatography and electrospray ionization mass spectrometry

被引:35
作者
Breindahl, T [1 ]
Andreasen, K [1 ]
机构
[1] Hjorring Bronderslev Hosp, Dept Clin Chem, DK-9800 Hjorring, Denmark
来源
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES | 1999年 / 732卷 / 01期
关键词
11-nor-Delta(9)-tetrahydrocannabinol-9-carboxylic acid;
D O I
10.1016/S0378-4347(99)00276-5
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
High-performance liquid chromatography with electrospray ionization mass spectrometry was used to determine 11-nor-Delta(9)-tetrahydrocannabinol-9-carboxylic acid (THC-COOH) in urine. After basic hydrolysis of conjugates, the compound was extracted using SPEC-PLUS-3ML-C-18 solid-phase extraction columns. A deuterium labelled internal standard (d(3)-THCCOOH) was added prior to hydrolysis. Separation was performed on a reversed-phase Zorbax Eclipse XDB-C-8 analytical column (150x3.0 mm LD.) using a gradient program from 60 to 80% acetonitrile (4 mM formic acid) at a flow-rate of 0.5 ml/min. The compounds were detected by single ion monitoring of m/z 345 and m/z 348 for the protonated molecules [THC-COOH+H](+) and [d(3)-THC-COOH+H](+), respectively. The precision and accuracy were tested on spiked urine samples in the range 2.5-125 ng/ml. The mean recovery was 95% (n=58), coefficients of variations were 2.2-4.3% and the limit of detection 2 ng/ml. Diagnostic qualifying ions of THC-COOH (m/z 327 and m/z 299) and d(3)-THC-COOH (m/z 330) were generated using up-front collision-induced dissociation. The relative ion intensities in clinical samples (n=21) were within +/-20% deviation compared with standards. Using this tolerance and the presence of the ions m/z 327 and m/z 299 at the correct retention times as the acceptance criteria for identification of THC-COOH positive samples, the limit of detection was 15 ng/ml. The LC-MS method complies with the current recommendations on drugs of abuse testing, in which mass spectrometric detection is emphasized. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:155 / 164
页数:10
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