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Qualitative method validation and uncertainty evaluation via the binary output: II - Application to a multi-analyte LC-MS/MS method for oral fluid

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Qualitative method validation and uncertainty evaluation via the binary output: II - Application to a multi-analyte LC-MS/MS method for oral fluid

Desharnais, Brigitte ORCID: https://orcid.org/0000-0001-7373-656X, Lajoie, Marie-Jo, Laquerre, Julie, Mireault, Pascal and Skinner, Cameron D. (2019) Qualitative method validation and uncertainty evaluation via the binary output: II - Application to a multi-analyte LC-MS/MS method for oral fluid. Journal of Analytical Toxicology . ISSN 0146-4760 (Submitted)

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Abstract

A study of impaired driving rates in the province of Québec is currently planned following the legalization of recreational cannabis in Canada. Oral fluid (OF) samples are to be collected with a Quantisal device and sent to the laboratory for analysis. In order to prepare for this project, a qualitative decision point analysis method monitoring for the presence of 97 drugs and metabolites in OF was validated according to the guidelines presented in the first part of this paper (I – Validation guidelines and statistical foundations).

This high throughput method uses incubation with a precipitation solvent (acetone:acetonitrile 30:70 v:v) to boost drug recovery from the collecting device and improve stability of benzodiazepines (e.g. α-hydroxyalprazolam, clonazepam, 7-aminoclonazepam, flunitrazepam, 7-aminoflunitrazepam, N-desmethylflunitrazepam, nitrazepam). The Quantisal device has polyglycol in its stabilizing buffer but timed use of the mass spectrometer waste valve proved sufficient to avoid the glycol interferences for nearly all analytes. Interferences from OF matrices and 140 potentially interfering compounds, carryover, ion ratios, stability, recovery, reproducibility, robustness, false positive rate, false negative rate, selectivity, sensitivity and reliability rates were tested in the validation process. Five of the targeted analytes (olanzapine, oxazepam, 7-aminoclonazepam, flunitrazepam and nitrazepam) did not meet the set validation criteria but will be monitored for identification purposes (no comparison to a cut-off level).

Blind internal proficiency teting was performed, where six OF samples were tested and analytes were classified as “negative”, “likely positive” or “positive” with success. The final validated OF qualitative decision point method covers 92 analytes, and the presence of 5 additional analytes is screened in this high hroughput analysis.

Divisions:Concordia University > Faculty of Arts and Science > Chemistry and Biochemistry
Item Type:Article
Refereed:No
Authors:Desharnais, Brigitte and Lajoie, Marie-Jo and Laquerre, Julie and Mireault, Pascal and Skinner, Cameron D.
Journal or Publication:Journal of Analytical Toxicology
Corporate Authors:Laboratoire de sciences judiciaires et de médecine légale, Department of Toxicology, 1701 Parthenais Street, Montréal, Québec, Canada H2K 3S7, Concordia University, Department of Chemistry & Biochemistry, 7141 Sherbrooke Street West, Montréal, Québec, Canada H4B 1R6
Date:19 June 2019
Projects:
  • Qualitative method validation guidelines
Funders:
  • National Sciences and Engineering Research Council of Canada
  • Fonds de recherche du Québec - Nature et technologies
Keywords:Qualitative decision point methods, oral fluid, saliva, Quantisal, liquid chromatography mass spectrometry, oral fluid, roadside survey
ID Code:985534
Deposited By: BRIGITTE DESHARNAIS
Deposited On:27 Jun 2019 14:24
Last Modified:27 Jun 2019 14:24

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