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Evaluation of a solid-phase extraction method for benzoylecgonine urine analysis in a high-throughput forensic urine drug-testing laboratory.
- Source :
-
Journal of analytical toxicology [J Anal Toxicol] 2002 Oct; Vol. 26 (7), pp. 401-5. - Publication Year :
- 2002
-
Abstract
- A novel extraction and derivatization procedure for the cocaine metabolite benzoylecgonine (BZE) was developed and evaluated for use in a high-volume forensic urine analysis laboratory. Extractions utilized a Speedisk 48 positive pressure extraction manifold and polymer-based cation-exchange extraction columns. Samples were derivatized by the addition of pentafluoropropionic anhydride and pentafluoropropanol. All analyses were performed in selected ion monitoring mode; ions included m/z 421, 300, 272, 429, and 303 with m/z 421 to 429 ratio used for quantitation. The average extraction efficiency was 80%. Seventy-five common over-the-counter products, including prescription drugs, drug metabolites, and other drugs of abuse, demonstrated no significant interference with respect to chromatography or quantitation. The limit of detection and limit of quantitation were calculated at 12.5 ng/mL, and the assay was linear from 12.5 to 20,000 ng/mL with an r2 of 0.99932. A series of 20 precision samples (100 ng/mL) produced an average response of 97.8 ng/mL and a percent coefficient of variation of 4.1%. A set of 79 archived human urine samples that had previously been found to contain BZE were analyzed by 3 separate laboratories. The results did not differ significantly from prior quantitation or between laboratories. The Speedisk has proven viable for a high-volume production facility reducing overall cost of analysis by decreasing analysis time and minimizing waste production while meeting strict forensic requirements.
- Subjects :
- Chemistry Techniques, Analytical methods
Cocaine-Related Disorders diagnosis
Efficiency
Forensic Medicine
Gas Chromatography-Mass Spectrometry methods
Humans
Reproducibility of Results
Chromatography, Ion Exchange methods
Cocaine analogs & derivatives
Cocaine urine
Cocaine-Related Disorders urine
Substance Abuse Detection methods
Subjects
Details
- Language :
- English
- ISSN :
- 0146-4760
- Volume :
- 26
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Journal of analytical toxicology
- Publication Type :
- Academic Journal
- Accession number :
- 12422992
- Full Text :
- https://doi.org/10.1093/jat/26.7.401