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Trif C, Harpaz D, Eltzov E, Parcharoen Y, Pechyen C, Marks RS. Detection of Cannabinoids in Oral Fluid Specimens as the Preferred Biological Matrix for a Point-of-Care Biosensor Diagnostic Device. BIOSENSORS 2024; 14:126. [PMID: 38534233 DOI: 10.3390/bios14030126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 02/18/2024] [Accepted: 02/21/2024] [Indexed: 03/28/2024]
Abstract
An increasing number of countries have started to decriminalize or legalize the consumption of cannabis for recreational and medical purposes. The active ingredients in cannabis, termed cannabinoids, affect multiple functions in the human body, including coordination, motor skills, memory, response time to external stimuli, and even judgment. Cannabinoids are a unique class of terpeno-phenolic compounds, with 120 molecules discovered so far. There are certain situations when people under the influence of cannabis may be a risk to themselves or the public safety. Over the past two decades, there has been a growing research interest in detecting cannabinoids from various biological matrices. There is a need to develop a rapid, accurate, and reliable method of detecting cannabinoids in oral fluid as it can reveal the recent intake in comparison with urine specimens, which only show a history of consumption. Significant improvements are continuously made in the analytical formats of various technologies, mainly concerning improving their sensitivity, miniaturization, and making them more user-friendly. Additionally, sample collection and pretreatment have been extensively studied, and specific devices for collecting oral fluid specimens have been perfected to allow rapid and effective sample collection. This review presents the recent findings regarding the use of oral fluid specimens as the preferred biological matrix for cannabinoid detection in a point-of-care biosensor diagnostic device. A critical review is presented, discussing the findings from a collection of review and research articles, as well as publicly available data from companies that manufacture oral fluid screening devices. Firstly, the various conventional methods used to detect cannabinoids in biological matrices are presented. Secondly, the detection of cannabinoids using point-of-care biosensors is discussed, emphasizing oral fluid specimens. This review presents the current pressing technological challenges and highlights the gaps where new technological solutions can be implemented.
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Affiliation(s)
- Călin Trif
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Dorin Harpaz
- Institute of Biochemistry, Food Science and Nutrition, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
- Department of Postharvest Science of Fresh Fruit, Volcani Center, Agricultural Research Organization, Rishon LeZion 7505101, Israel
| | - Evgeni Eltzov
- Department of Postharvest Science of Fresh Fruit, Volcani Center, Agricultural Research Organization, Rishon LeZion 7505101, Israel
| | - Yardnapar Parcharoen
- Chulabhorn International College of Medicine, Thammasat University, Klong Luang 12120, Pathum Thani, Thailand
| | - Chiravoot Pechyen
- Center of Excellence in Modern Technology and Advanced Manufacturing for Medical Innovation, Thammasat University, Klong Luang 12120, Pathum Thani, Thailand
- Department of Materials and Textile Technology, Faculty of Science and Technology, Thammasat University, Klong Luang 12120, Pathum Thani, Thailand
| | - Robert S Marks
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
- The Ilse Katz Center for Meso and Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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Automation System for the Flexible Sample Preparation for Quantification of Δ9-THC-D3, THC-OH and THC-COOH from Serum, Saliva and Urine. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12062838] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In the life sciences, automation solutions are primarily established in the field of drug discovery. However, there is also an increasing need for automated solutions in the field of medical diagnostics, e.g., for the determination of vitamins, medication or drug abuse. While the actual metrological determination is highly automated today, the necessary sample preparation processes are still mainly carried out manually. In the laboratory, flexible solutions are required that can be used to determine different target substances in different matrices. A suitable system based on an automated liquid handler was implemented. It has been tested and validated for the determination of three cannabinoid metabolites in blood, urine and saliva. To extract Δ9-tetrahydrocannabinol-D3 (Δ9-THC-D3), 11-hydroxy-Δ9-tetrahydrocannabinol (THC-OH) and 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THC-COOH) from serum, urine and saliva both rapidly and cost-effectively, three sample preparation methods automated with a liquid handling robot are presented in this article, the basic framework of which is an identical SPE method so that they can be quickly exchanged against each other when the matrix is changed. If necessary, the three matrices could also be prepared in parallel. For the sensitive detection of analytes, protein precipitation is used when preparing serum before SPE and basic hydrolysis is used for urine to cleave the glucuronide conjugate. Recoveries of developed methods are >77%. Coefficients of variation are <4%. LODs are below 1 ng/mL and a comparison with the manual process shows a significant cost reduction.
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Chen HC, Lee PD, Chang YZ. Development of a rapid and sensitive LC-MS/MS assay for the quantification of commonly abused drugs in Asia in a micro-segment of a single hair using microwave-assisted extraction and dansyl chloride derivatization. J Pharm Biomed Anal 2022; 213:114678. [DOI: 10.1016/j.jpba.2022.114678] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 02/15/2022] [Accepted: 02/16/2022] [Indexed: 11/30/2022]
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Gorziza RP, Duarte JA, González M, Arroyo-Mora LE, Limberger RP. A systematic review of quantitative analysis of cannabinoids in oral fluid. J Forensic Sci 2021; 66:2104-2112. [PMID: 34405898 DOI: 10.1111/1556-4029.14862] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 07/12/2021] [Accepted: 08/03/2021] [Indexed: 11/30/2022]
Abstract
Cannabis sativa L. is a substance widely used around the world for recreational and medicinal purposes. Oral fluid has been investigated as an alternative biological matrix for demonstrating the illegal use of cannabis, particularly in situations where its recent use needs to be identified. In the last two decades, many methods have been developed to detect and quantify cannabinoids in oral fluid, especially for Δ9 -tetrahydrocannabinol, the primary psychoactive substance of cannabis. However, some aspects must be considered in the use of these techniques, such as cannabinoids recoveries or extraction efficiency from different oral fluid collection devices/containers. Pharmacokinetic studies have shown that the presence of minor cannabinoids and metabolites in the analysis of oral fluid may be valuable in interpreting tests, which indicates the need to improve the sensitivity of detecting low concentrations. The aim of this review is to summarize and to describe the methodologies for the quantitative analysis of cannabinoids in oral fluid that have previously been investigated. A systematic search for articles was performed of four different databases, using the descriptor "cannabinoids and oral fluid". Forty-seven studies that examined quantitative methods were identified. The analytical data described in these articles, including oral fluid collection, sample preparation, cannabinoids recovery and extraction efficiency, detection instruments, and quantification limits, were analyzed. The discussion of these particular features of cannabinoid analysis in oral fluid could help to improve or to develop methods for use in Forensic Toxicology.
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Affiliation(s)
- Roberta Petry Gorziza
- Department of Pharmacy, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | | | - Marina González
- Department of Pharmacy, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Luis E Arroyo-Mora
- Department of Forensic and Investigative Science, West Virginia University, Morgantown, West Virginia, USA
| | - Renata Pereira Limberger
- Department of Forensic and Investigative Science, West Virginia University, Morgantown, West Virginia, USA
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Khamis MM, Adamko DJ, El-Aneed A. STRATEGIES AND CHALLENGES IN METHOD DEVELOPMENT AND VALIDATION FOR THE ABSOLUTE QUANTIFICATION OF ENDOGENOUS BIOMARKER METABOLITES USING LIQUID CHROMATOGRAPHY-TANDEM MASS SPECTROMETRY. MASS SPECTROMETRY REVIEWS 2021; 40:31-52. [PMID: 31617245 DOI: 10.1002/mas.21607] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Accepted: 09/08/2019] [Indexed: 06/10/2023]
Abstract
Metabolomics is a dynamically evolving field, with a major application in identifying biomarkers for drug development and personalized medicine. Numerous metabolomic studies have identified endogenous metabolites that, in principle, are eligible for translation to clinical practice. However, few metabolomic-derived biomarker candidates have been qualified by regulatory bodies for clinical applications. Such interruption in the biomarker qualification process can be largely attributed to various reasons including inappropriate study design and inadequate data to support the clinical utility of the biomarkers. In addition, the lack of robust assays for the routine quantification of candidate biomarkers has been suggested as a potential bottleneck in the biomarker qualification process. In fact, the nature of the endogenous metabolites precludes the application of the current validation guidelines for bioanalytical methods. As a result, there have been individual efforts in modifying existing guidelines and/or developing alternative approaches to facilitate method validation. In this review, three main challenges for method development and validation for endogenous metabolites are discussed, namely matrix effects evaluation, alternative analyte-free matrices, and the choice of internal standards (ISs). Some studies have modified the equations described by the European Medicines Agency for the evaluation of matrix effects. However, alternative strategies were also described; for instance, calibration curves can be generated in solvents and in biological samples and the slopes can be compared through ratios, relative standard deviation, or a modified Stufour suggested approaches while quantifying mainly endogenous metabolitesdent t-test. ISs, on the contrary, are diverse; in which seven different possible types, used in metabolomics-based studies, were identified in the literature. Each type has its advantages and limitations; however, isotope-labeled ISs and ISs created through isotope derivatization show superior performance. Finally, alternative matrices have been described and tested during method development and validation for the quantification of endogenous entities. These alternatives are discussed in detail, highlighting their advantages and shortcomings. The goal of this review is to compare, apprise, and debate current knowledge and practices in order to aid researchers and clinical scientists in developing robust assays needed during the qualification process of candidate metabolite biomarkers. © 2019 John Wiley & Sons Ltd. Mass Spec Rev.
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Affiliation(s)
- Mona M Khamis
- College of Pharmacy and Nutrition, University of Saskatchewan, 107 Wiggins Rd, Saskatoon, Saskatchewan, S7N 5E5, Canada
| | - Darryl J Adamko
- Department of Pediatrics, College of Medicine, University of Saskatchewan, 103 Hospital Drive, Saskatoon, Saskatchewan, Canada
| | - Anas El-Aneed
- College of Pharmacy and Nutrition, University of Saskatchewan, 107 Wiggins Rd, Saskatoon, Saskatchewan, S7N 5E5, Canada
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Abd-Elsalam WH, Alsherbiny MA, Kung JY, Pate DW, Löbenberg R. LC–MS/MS quantitation of phytocannabinoids and their metabolites in biological matrices. Talanta 2019; 204:846-867. [PMID: 31357374 DOI: 10.1016/j.talanta.2019.06.053] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 06/09/2019] [Accepted: 06/11/2019] [Indexed: 12/27/2022]
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Luo YR, Han J, Yun C, Lynch KL. Azo coupling-based derivatization method for high-sensitivity liquid chromatography-tandem mass spectrometry analysis of tetrahydrocannabinol and other aromatic compounds. J Chromatogr A 2019; 1597:109-118. [PMID: 30910385 DOI: 10.1016/j.chroma.2019.03.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 03/01/2019] [Accepted: 03/14/2019] [Indexed: 10/27/2022]
Abstract
An azo coupling-based derivatization method is reported for high-sensitivity liquid chromatography-tandem mass spectrometry (LC-MS/MS) quantitation of tetrahydrocannabinol (THC) and other aromatic compounds, i.e. phenols and amines. Through the azo coupling of a diazonium to an analyte, it produces a derivatized analyte which has enhanced ionization efficiency and results in high-response fragments in tandem mass spectrometry. The derivatization method was applied to six typical aromatic compounds using three different diazonium salts as derivatization reagents, demonstrating its applicability to a variety of analytes and reagents. The derivatization reaction can be directly carried out in neat samples, and after derivatization the samples can be immediately sent to the LC-MS/MS instrument for analysis. These advantages facilitate a one-step sample preparation procedure that can be completed in less than one hour, allowing for a "derivatize & shoot" lab workflow. The derivatization method was applied to establish an LC-MS/MS assay for the quantitation of THC in human breath samples. The derivatization conditions were studied in this application, including the effects of acidity, organic solvent, and diazonium concentration in the reaction. The THC derivatization assay was validated and achieved a limit of quantitation (LOQ) of 0.50 pg/ml using either of the two regio-isomers of the azo-derivative of THC (THC-DRV). To prove that the derivatization method has compatibility with complex-matrix samples, a THC derivatization assay for serum samples was established, in which the azo coupling reaction was directly carried out in crude protein-precipitated supernatants. An LOQ of 5.0 pg/ml was achieved. In addition, excellent correlation between THC derivatization and non-derivatization assays was found in the analysis of whole blood samples.
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Affiliation(s)
- Yiqi Ruben Luo
- Department of Laboratory Medicine, University of California, San Francisco, and Zuckerberg San Francisco General Hospital, San Francisco, CA, USA.
| | - Jichun Han
- Applin Biotech Inc., Hangzhou, Zhejiang, China
| | - Cassandra Yun
- Department of Laboratory Medicine, University of California, San Francisco, and Zuckerberg San Francisco General Hospital, San Francisco, CA, USA
| | - Kara L Lynch
- Department of Laboratory Medicine, University of California, San Francisco, and Zuckerberg San Francisco General Hospital, San Francisco, CA, USA
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Desrosiers NA, Huestis MA. Oral Fluid Drug Testing: Analytical Approaches, Issues and Interpretation of Results. J Anal Toxicol 2019; 43:415-443. [DOI: 10.1093/jat/bkz048] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/12/2019] [Accepted: 05/23/2019] [Indexed: 12/19/2022] Open
Abstract
AbstractWith advances in analytical technology and new research informing result interpretation, oral fluid (OF) testing has gained acceptance over the past decades as an alternative biological matrix for detecting drugs in forensic and clinical settings. OF testing offers simple, rapid, non-invasive, observed specimen collection. This article offers a review of the scientific literature covering analytical methods and interpretation published over the past two decades for amphetamines, cannabis, cocaine, opioids, and benzodiazepines. Several analytical methods have been published for individual drug classes and, increasingly, for multiple drug classes. The method of OF collection can have a significant impact on the resultant drug concentration. Drug concentrations for amphetamines, cannabis, cocaine, opioids, and benzodiazepines are reviewed in the context of the dosing condition and the collection method. Time of last detection is evaluated against several agencies' cutoffs, including the proposed Substance Abuse and Mental Health Services Administration, European Workplace Drug Testing Society and Driving Under the Influence of Drugs, Alcohol and Medicines cutoffs. A significant correlation was frequently observed between matrices (i.e., between OF and plasma or blood concentrations); however, high intra-subject and inter-subject variability precludes prediction of blood concentrations from OF concentrations. This article will assist individuals in understanding the relative merits and limitations of various methods of OF collection, analysis and interpretation.
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Affiliation(s)
| | - Marilyn A Huestis
- Lambert Center for the Study of Medicinal Cannabis and Hemp, Institute of Emerging Health Professions, Thomas Jefferson University, Philadelphia, PA, USA
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Reinstadler V, Lierheimer S, Boettcher M, Oberacher H. A validated workflow for drug detection in oral fluid by non-targeted liquid chromatography-tandem mass spectrometry. Anal Bioanal Chem 2019; 411:867-876. [PMID: 30519959 PMCID: PMC6338695 DOI: 10.1007/s00216-018-1504-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 11/05/2018] [Accepted: 11/19/2018] [Indexed: 12/16/2022]
Abstract
Oral fluid is recognized as an important specimen for drug testing. Common applications are monitoring in substance abuse treatment programs, therapeutic drug monitoring, pain management, workplace drug testing, clinical toxicology, and driving under the influence of drugs (DRUID). In this study, we demonstrate that non-targeted LC-MS/MS with subsequent compound identification by tandem mass spectral library search is a valuable tool for comprehensive detection and confirmation of drugs in oral fluid samples. The workflow developed involves solid-phase extraction and chromatographic separation on reversed phase materials. Mass spectrometric detection is accomplished on a quadrupole-quadrupole-time-of-flight instrument operated with data-dependent acquisition control. The workflow was optimized for 500 μl of neat oral fluid collected with the Greiner Bio-One saliva collection system. The fitness of the developed method was tested and proven by analyzing blank and spiked samples as well as 59 authentic patient samples. We could demonstrate that compounds with logP values in the range 0.5-5.5 are efficiently detected at low nanograms per milliliter concentrations. The true positive and true negative rates of automated library search were equal or close to 100%. The beauty of the non-targeted LC-MS/MS approach is the ability to detect compounds hardly included in routinely applied targeted assays, and this was demonstrated by detecting the synthetic opioid U-47700 in two patient samples. Graphical abstract ᅟ.
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Affiliation(s)
- Vera Reinstadler
- Institute of Legal Medicine and Core Facility Metabolomics, Medical University of Innsbruck, Muellerstr. 44, 6020, Innsbruck, Austria
| | - Stefan Lierheimer
- MVZ Labor Dessau GmbH, Bauhüttenstr. 6, 06847, Dessau-Roßlau, Germany
| | - Michael Boettcher
- MVZ Labor Dessau GmbH, Bauhüttenstr. 6, 06847, Dessau-Roßlau, Germany
| | - Herbert Oberacher
- Institute of Legal Medicine and Core Facility Metabolomics, Medical University of Innsbruck, Muellerstr. 44, 6020, Innsbruck, Austria.
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Abstract
Oral fluid has become an important matrix for drugs of abuse analysis. These days the applicability is challenged by the fact that an increasing number of new psychoactive drugs are coming on the market. Synthetic cannabinoids and synthetic cathinones have been the main drug classes, but the diversity is increasing and other drugs like piperazines, phenethylamines, tryptamines, designer opioids and designer benzodiazepines are becoming more prevalent. Many of the substances are very potent, and low doses ingested will lead to low concentrations in biological media, including oral fluid. This review will highlight the phenomenon of new psychoactive substances and review methods for oral fluid drug testing analysis using on-site tests, immunoassays and chromatographic methods.
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Cela-Pérez MC, Bates F, Jiménez-Morigosa C, Lendoiro E, de Castro A, Cruz A, López-Rivadulla M, López-Vilariño JM, González-Rodríguez MV. Water-compatible imprinted pills for sensitive determination of cannabinoids in urine and oral fluid. J Chromatogr A 2015; 1429:53-64. [PMID: 26718187 DOI: 10.1016/j.chroma.2015.12.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Revised: 11/18/2015] [Accepted: 12/04/2015] [Indexed: 11/28/2022]
Abstract
A novel molecularly imprinted solid phase extraction (MISPE) methodology followed by liquid chromatography tandem mass spectrometry (LC-MS/MS) has been developed using cylindrical shaped molecularly imprinted pills for detection of Δ(9)-tetrahydrocannabinol (THC), 11-nor-Δ(9)-tetrahydrocannabinol carboxylic acid (THC-COOH), cannabinol (CBN) and cannabidiol (CBD) in urine and oral fluid (OF). The composition of the molecular imprinted polymer (MIP) was optimized based on the screening results of a non-imprinted polymer library (NIP-library). Thus, acrylamide as functional monomer and ethylene glycol dimethacrylate as cross-linker were selected for the preparation of the MIP, using catechin as a mimic template. MISPE pills were incubated with 0.5 mL urine or OF sample for adsorption of analytes. For desorption, the pills were transferred to a vial with 2 mL of methanol:acetic acid (4:1) and sonicated for 15 min. The elution solvent was evaporated and reconstituted in methanol:formic acid (0.1%) 50:50 to inject in LC-MS/MS. The developed method was linear over the range from 1 to 500 ng mL(-1) in urine and from 0.75 to 500 ng mL(-1) in OF for all four analytes. Intra- and inter-day imprecision were <15%. Extraction recovery was 50-111%, process efficiency 15.4-54.5% and matrix effect ranged from -78.0 to -6.1%. Finally, the optimized and validated method was applied to 4 urine and 5 OF specimens. This is the first method for the determination of THC, THC-COOH, CBN and CBD in urine and OF using MISPE technology.
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Affiliation(s)
- M Concepción Cela-Pérez
- Grupo de Polímeros, Centro de Investigaciones Tecnológicas, Universidad de A Coruña, Campus de Esteiro s/n, 15403 Ferrol, Spain
| | - Ferdia Bates
- Grupo de Polímeros, Centro de Investigaciones Tecnológicas, Universidad de A Coruña, Campus de Esteiro s/n, 15403 Ferrol, Spain
| | - Cristian Jiménez-Morigosa
- Servicio de Toxicología, Instituto de Ciencias Forenses, Universidad de Santiago de Compostela, San Francisco s/n, 15782 Santiago de Compostela, Spain
| | - Elena Lendoiro
- Servicio de Toxicología, Instituto de Ciencias Forenses, Universidad de Santiago de Compostela, San Francisco s/n, 15782 Santiago de Compostela, Spain.
| | - Ana de Castro
- Servicio de Toxicología, Instituto de Ciencias Forenses, Universidad de Santiago de Compostela, San Francisco s/n, 15782 Santiago de Compostela, Spain
| | - Angelines Cruz
- Servicio de Toxicología, Instituto de Ciencias Forenses, Universidad de Santiago de Compostela, San Francisco s/n, 15782 Santiago de Compostela, Spain
| | - Manuel López-Rivadulla
- Servicio de Toxicología, Instituto de Ciencias Forenses, Universidad de Santiago de Compostela, San Francisco s/n, 15782 Santiago de Compostela, Spain
| | - José M López-Vilariño
- Grupo de Polímeros, Centro de Investigaciones Tecnológicas, Universidad de A Coruña, Campus de Esteiro s/n, 15403 Ferrol, Spain.
| | - M Victoria González-Rodríguez
- Grupo de Polímeros, Centro de Investigaciones Tecnológicas, Universidad de A Coruña, Campus de Esteiro s/n, 15403 Ferrol, Spain
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Quantification of 11-nor-9-carboxy-δ9-tetrahydrocannabinol in human oral fluid by gas chromatography-tandem mass spectrometry. Ther Drug Monit 2015; 36:225-33. [PMID: 24622724 DOI: 10.1097/01.ftd.0000443071.30662.01] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A sensitive and specific method for the quantification of 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THCCOOH) in oral fluid collected with the Quantisal and Oral-Eze devices was developed and fully validated. Extracted analytes were derivatized with hexafluoroisopropanol and trifluoroacetic anhydride and quantified by gas chromatography-tandem mass spectrometry with negative chemical ionization. Standard curves, using linear least-squares regression with 1/x weighting were linear from 10 to 1000 ng/L with coefficients of determination >0.998 for both collection devices. Bias was 89.2%-112.6%, total imprecision 4.0%-5.1% coefficient of variation, and extraction efficiency >79.8% across the linear range for Quantisal-collected specimens. Bias was 84.6%-109.3%, total imprecision 3.6%-7.3% coefficient of variation, and extraction efficiency >92.6% for specimens collected with the Oral-Eze device at all 3 quality control concentrations (10, 120, and 750 ng/L). This effective high-throughput method reduces analysis time by 9 minutes per sample compared with our current 2-dimensional gas chromatography-mass spectrometry method and extends the capability of quantifying this important oral fluid analyte to gas chromatography-tandem mass spectrometry. This method was applied to the analysis of oral fluid specimens collected from individuals participating in controlled cannabis studies and will be effective for distinguishing passive environmental contamination from active cannabis smoking.
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Andås HT, Krabseth HM, Enger A, Marcussen BN, Haneborg AM, Christophersen AS, Vindenes V, Øiestad EL. Detection Time for THC in Oral Fluid After Frequent Cannabis Smoking. Ther Drug Monit 2014; 36:808-14. [DOI: 10.1097/ftd.0000000000000092] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Desrosiers NA, Scheidweiler KB, Huestis MA. Quantification of six cannabinoids and metabolites in oral fluid by liquid chromatography-tandem mass spectrometry. Drug Test Anal 2014; 7:684-94. [DOI: 10.1002/dta.1753] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2014] [Revised: 10/07/2014] [Accepted: 10/24/2014] [Indexed: 12/16/2022]
Affiliation(s)
- Nathalie A. Desrosiers
- Chemistry and Drug Metabolism, Intramural Research Program; National Institute on Drug Abuse, National Institutes of Health; 251 Bayview Boulevard Baltimore MD 21224 USA
- Program in Toxicology; University of Maryland Baltimore; 620 W. Lexington St Baltimore MD 21201 USA
| | - Karl B. Scheidweiler
- Chemistry and Drug Metabolism, Intramural Research Program; National Institute on Drug Abuse, National Institutes of Health; 251 Bayview Boulevard Baltimore MD 21224 USA
| | - Marilyn A. Huestis
- Chemistry and Drug Metabolism, Intramural Research Program; National Institute on Drug Abuse, National Institutes of Health; 251 Bayview Boulevard Baltimore MD 21224 USA
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Míguez-Framil M, Cocho JÁ, Tabernero MJ, Bermejo AM, Moreda-Piñeiro A, Bermejo-Barrera P. An improved method for the determination of ∆9-tetrahydrocannabinol, cannabinol and cannabidiol in hair by liquid chromatography–tandem mass spectrometry. Microchem J 2014. [DOI: 10.1016/j.microc.2014.05.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Thieme D, Sachs U, Sachs H, Moore C. Significant enhancement of 11-Hydroxy-THC detection by formation of picolinic acid esters and application of liquid chromatography/multi stage mass spectrometry (LC-MS3): Application to hair and oral fluid analysis. Drug Test Anal 2014; 7:577-85. [DOI: 10.1002/dta.1739] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 09/30/2014] [Accepted: 10/01/2014] [Indexed: 11/12/2022]
Affiliation(s)
- Detlef Thieme
- Institute of Doping Analysis; Dresdner str. 12 01731 Kreischa Germany
| | - Ulf Sachs
- Albert-Ludwigs-University; Albertstr. 21 79104 Freiburg Germany
| | - Hans Sachs
- Forensic Toxicological Center; Bayerstr. 53 80335 Munich Germany
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Yang NC, Song TY, Chang YZ, Chen MY, Hu ML. Up-regulation of nicotinamide phosphoribosyltransferase and increase of NAD+ levels by glucose restriction extend replicative lifespan of human fibroblast Hs68 cells. Biogerontology 2014; 16:31-42. [PMID: 25146190 DOI: 10.1007/s10522-014-9528-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Accepted: 08/13/2014] [Indexed: 10/24/2022]
Abstract
Calorie restriction (CR) extends lifespan in a remarkable range of organisms. However, the mechanisms of CR related to the longevity effects are not fully elucidated to date. Using human fibroblast Hs68 (Hs68) cells cultured at a lower level of medium glucose (i.e., glucose restriction; GR) to mimic CR, we investigated the crucial role of nicotinamide phosphoribosyltransferase (Nampt), nicotinamide adenine dinucleotide (NAD(+)), and nicotinamide (NAM) in GR-extended replicative lifespan of Hs68 cells. We found that GR extended the lifespan of Hs68 cells, in parallel to significantly increased expression of Nampt, intracellular NAD(+) levels, and SIRT1 activities, and to significantly decreased NAM levels. The lifespan-extending effects of GR were profoundly diminished by FK866 (a noncompetitive inhibitor of Nampt) and blocked by sirtinol (a noncompetitive inhibitor of sirtuins). However, the steady-state intracellular NAM level (averaged 2.5 μM) was much lower than the IC50 of NAM on human SIRT1 (about 50 μM). All these results suggest that up-regulation of Nampt play an important role in GR-extended lifespan of Hs68 cells by increasing the intracellular NAD(+) levels followed by activating SIRT1 activity in Hs68 cells. In contrast, the role of NAM depletion is limited.
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Affiliation(s)
- Nae-Cherng Yang
- School of Nutrition, Chung Shan Medical University, No.110, Sec.1, Jianguo N. Rd., Taichung City, 40201, Taiwan, ROC,
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18
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Abstract
The use of alternative matrices such as oral fluid and hair has increased in the past decades because of advances in analytical technology. However, there are still many issues that need to be resolved. Standardized protocols of sample pretreatment are needed to link the detected concentrations to final conclusions. The development of suitable proficiency testing schemes is required. Finally, interpretation issues such as link to effect, adulteration, detection markers and thresholds will hamper the vast use of these matrices. Today, several niche areas apply these matrices with success, such as drugs and driving for oral fluid and drug-facilitated crimes for hair. Once those issues are resolved, the number of applications will markedly grow in the future.
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Lee D, Huestis MA. Current knowledge on cannabinoids in oral fluid. Drug Test Anal 2014; 6:88-111. [PMID: 23983217 PMCID: PMC4532432 DOI: 10.1002/dta.1514] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 06/21/2013] [Accepted: 06/24/2013] [Indexed: 11/09/2022]
Abstract
Oral fluid (OF) is a new biological matrix for clinical and forensic drug testing, offering non-invasive and directly observable sample collection reducing adulteration potential, ease of multiple sample collections, lower biohazard risk during collection, recent exposure identification, and stronger correlation with blood than urine concentrations. Because cannabinoids are usually the most prevalent analytes in illicit drug testing, application of OF drug testing requires sufficient scientific data to support sensitive and specific OF cannabinoid detection. This review presents current knowledge of OF cannabinoids, evaluating pharmacokinetic properties, detection windows, and correlation with other biological matrices and impairment from field applications and controlled drug administration studies. In addition, onsite screening technologies, confirmatory analytical methods, drug stability, and effects of sample collection procedure, adulterants, and passive environmental exposure are reviewed. Delta-9-tetrahydrocannabinol OF concentrations could be >1000 µg/L shortly after smoking, whereas minor cannabinoids are detected at 10-fold and metabolites at 1000-fold lower concentrations. OF research over the past decade demonstrated that appropriate interpretation of test results requires a comprehensive understanding of distinct elimination profiles and detection windows for different cannabinoids, which are influenced by administration route, dose, and drug use history. Thus, each drug testing program should establish cut-off criteria, collection/analysis procedures, and storage conditions tailored to its purposes. Building a scientific basis for OF testing is ongoing, with continuing OF cannabinoids research on passive environmental exposure, drug use history, donor physiological conditions, and oral cavity metabolism needed to better understand mechanisms of cannabinoid OF disposition and expand OF drug testing applicability. Published 2013. This article is a U.S. Government work and is in the public domain in the USA.
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Affiliation(s)
- Dayong Lee
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, 21224, USA
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20
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Battista N, Sergi M, Montesano C, Napoletano S, Compagnone D, Maccarrone M. Analytical approaches for the determination of phytocannabinoids and endocannabinoids in human matrices. Drug Test Anal 2013; 6:7-16. [DOI: 10.1002/dta.1574] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 09/05/2013] [Accepted: 09/27/2013] [Indexed: 12/30/2022]
Affiliation(s)
- Natalia Battista
- Faculty of Bioscience and Technology for Food, Agriculture and Environment; University of Teramo; Teramo Italy
- European Center for Brain Research/Santa Lucia Foundation; Rome Italy
| | - Manuel Sergi
- Faculty of Bioscience and Technology for Food, Agriculture and Environment; University of Teramo; Teramo Italy
| | | | - Sabino Napoletano
- Department of Chemistry; Sapienza University of Rome; Rome Italy
- Department of Public Safety, Ministry of Interior; Forensic Service/GIPS; Ancona Italy
| | - Dario Compagnone
- Faculty of Bioscience and Technology for Food, Agriculture and Environment; University of Teramo; Teramo Italy
| | - Mauro Maccarrone
- European Center for Brain Research/Santa Lucia Foundation; Rome Italy
- Center of Integrated Research; Campus Bio-Medico University of Rome; Rome Italy
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21
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Anizan S, Milman G, Desrosiers N, Barnes AJ, Gorelick DA, Huestis MA. Oral fluid cannabinoid concentrations following controlled smoked cannabis in chronic frequent and occasional smokers. Anal Bioanal Chem 2013; 405:8451-61. [PMID: 23954944 PMCID: PMC3823692 DOI: 10.1007/s00216-013-7291-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 08/01/2013] [Accepted: 08/02/2013] [Indexed: 11/25/2022]
Abstract
Oral fluid (OF) is an alternative biological matrix for monitoring cannabis intake in drug testing, and drugged driving (DUID) programs, but OF cannabinoid test interpretation is challenging. Controlled cannabinoid administration studies provide a scientific database for interpreting cannabinoid OF tests. We compared differences in OF cannabinoid concentrations from 19 h before to 30 h after smoking a 6.8% THC cigarette in chronic frequent and occasional cannabis smokers. OF was collected with the Statsure Saliva Sampler™ OF device. 2D-GC-MS was used to quantify cannabinoids in 357 OF specimens; 65 had inadequate OF volume within 3 h after smoking. All OF specimens were THC-positive for up to 13.5 h after smoking, without significant differences between frequent and occasional smokers over 30 h. Cannabidiol (CBD) and cannabinol (CBN) had short median last detection times (2.5-4 h for CBD and 6-8 h for CBN) in both groups. THCCOOH was detected in 25 and 212 occasional and frequent smokers' OF samples, respectively. THCCOOH provided longer detection windows than THC in all frequent smokers. As THCCOOH is not present in cannabis smoke, its presence in OF minimizes the potential for false positive results from passive environmental smoke exposure, and can identify oral THC ingestion, while OF THC cannot. THC ≥ 1 μg/L, in addition to CBD ≥ 1 μg/L or CBN ≥ 1 μg/L suggested recent cannabis intake (≤13.5 h), important for DUID cases, whereas THC ≥ 1 μg/L or THC ≥ 2 μg/L cutoffs had longer detection windows (≥30 h), important for workplace testing. THCCOOH windows of detection for chronic, frequent cannabis smokers extended beyond 30 h, while they were shorter (0-24 h) for occasional cannabis smokers.
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Affiliation(s)
- Sebastien Anizan
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute of Drug Abuse, NIH, 251 Bayview Boulevard, Baltimore, 20892 MD, USA
| | - Garry Milman
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute of Drug Abuse, NIH, 251 Bayview Boulevard, Baltimore, 20892 MD, USA
| | - Nathalie Desrosiers
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute of Drug Abuse, NIH, 251 Bayview Boulevard, Baltimore, 20892 MD, USA
- Program in Toxicology, University of Maryland Baltimore, 660 West Redwood Street, Baltimore, 21224 MD, USA
| | - Allan J. Barnes
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute of Drug Abuse, NIH, 251 Bayview Boulevard, Baltimore, 20892 MD, USA
| | - David A. Gorelick
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute of Drug Abuse, NIH, 251 Bayview Boulevard, Baltimore, 20892 MD, USA
| | - Marilyn A. Huestis
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute of Drug Abuse, NIH, 251 Bayview Boulevard, Baltimore, 20892 MD, USA
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22
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Sergi M, Montesano C, Odoardi S, Mainero Rocca L, Fabrizi G, Compagnone D, Curini R. Micro extraction by packed sorbent coupled to liquid chromatography tandem mass spectrometry for the rapid and sensitive determination of cannabinoids in oral fluids. J Chromatogr A 2013; 1301:139-46. [DOI: 10.1016/j.chroma.2013.05.072] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 05/10/2013] [Accepted: 05/29/2013] [Indexed: 11/26/2022]
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23
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Analysis of 11-nor-9-carbonyl-∆9-tetrahydrocannabinol in human blood and bile by liquid chromatography–tandem mass spectrometry after derivatization with ethyl chloroformate and amines. Forensic Toxicol 2013. [DOI: 10.1007/s11419-013-0200-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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24
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Concheiro M, Lee D, Lendoiro E, Huestis MA. Simultaneous quantification of Δ(9)-tetrahydrocannabinol, 11-nor-9-carboxy-tetrahydrocannabinol, cannabidiol and cannabinol in oral fluid by microflow-liquid chromatography-high resolution mass spectrometry. J Chromatogr A 2013; 1297:123-30. [PMID: 23726246 PMCID: PMC3918468 DOI: 10.1016/j.chroma.2013.04.071] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 04/16/2013] [Accepted: 04/19/2013] [Indexed: 10/26/2022]
Abstract
Δ(9)-Tetrahydrocannabinol (THC) is the primary target in oral fluid (OF) for detecting cannabis intake. However, additional biomarkers are needed to solve interpretation issues, such as the possibility of passive inhalation by identifying 11-nor-9-carboxy-THC (THCCOOH), and determining recent cannabis smoking by identifying cannabidiol (CBD) and/or cannabinol (CBN). We developed and comprehensively validated a microflow liquid chromatography (LC)-high resolution mass spectrometry method for simultaneous quantification of THC, THCCOOH, CBD and CBN in OF collected with the Oral-Eze(®) and Quantisal™ devices. One milliliter OF-buffer solution (0.25mL OF and 0.5mL of Oral-Eze buffer, 1:3 dilution, or 0.75mL Quantisal buffer, 1:4 dilution) had proteins precipitated, and the supernatant subjected to CEREX™ Polycrom™ THC solid-phase extraction (SPE). Microflow LC reverse-phase separation was achieved with a gradient mobile phase of 10mM ammonium acetate pH 6 and acetonitrile over 10min. We employed a Q Exactive high resolution mass spectrometer, with compounds identified and quantified by targeted-MSMS experiments. The assay was linear 0.5-50ng/mL for THC, CBD and CBN, and 15-500pg/mL for THCCOOH. Intra- and inter-day and total imprecision were <10.8%CV and bias 86.5-104.9%. Extraction efficiency was 52.4-109.2%, process efficiency 12.2-88.9% and matrix effect ranged from -86 to -6.9%. All analytes were stable for 24h at 5°C on the autosampler. The method was applied to authentic OF specimens collected with Quantisal and Oral-Eze devices. This method provides a rapid simultaneous quantification of THCCOOH and THC, CBD, CBN, with good selectivity and sensitivity, providing the opportunity to improve interpretation of cannabinoid OF results by eliminating the possibility of passive inhalation and providing markers of recent cannabis smoking.
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Affiliation(s)
- Marta Concheiro
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, 251 Bayview Boulevard, Suite 200, Room 05A721, Baltimore, MD 21224, USA
| | - Dayong Lee
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, 251 Bayview Boulevard, Suite 200, Room 05A721, Baltimore, MD 21224, USA
| | - Elena Lendoiro
- Servicio de Toxicología Forense, Dpto. Anatomía Patológica y Ciencias Forenses, Facultad de Medicina, Universidad de Santiago de Compostela C/San Francisco s/n, Santiago de Compostela (A Coruña) 15782, Spain
| | - Marilyn A. Huestis
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, 251 Bayview Boulevard, Suite 200, Room 05A721, Baltimore, MD 21224, USA
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25
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Scheidweiler KB, Himes SK, Chen X, Liu HF, Huestis MA. 11-Nor-9-carboxy-∆9-tetrahydrocannabinol quantification in human oral fluid by liquid chromatography-tandem mass spectrometry. Anal Bioanal Chem 2013; 405:6019-27. [PMID: 23681203 PMCID: PMC3773502 DOI: 10.1007/s00216-013-7027-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 04/23/2013] [Accepted: 04/25/2013] [Indexed: 10/26/2022]
Abstract
Currently, ∆9-tetrahydrocannabinol (THC) is the analyte quantified for oral fluid cannabinoid monitoring. The potential for false-positive oral fluid cannabinoid results from passive exposure to THC-laden cannabis smoke raises concerns for this promising new monitoring technology. Oral fluid 11-nor-9-carboxy-∆9-tetrahydrocannabinol (THCCOOH) is proposed as a marker of cannabis intake since it is not present in cannabis smoke and was not measureable in oral fluid collected from subjects passively exposed to cannabis. THCCOOH concentrations are in the picogram per milliliter range in oral fluid and pose considerable analytical challenges. A liquid chromatography-tandem mass spectrometry (LCMSMS) method was developed and validated for quantifying THCCOOH in 1 mL Quantisal-collected oral fluid. After solid phase extraction, chromatography was performed on a Kinetex C18 column with a gradient of 0.01% acetic acid in water and 0.01% acetic acid in methanol with a 0.5-mL/min flow rate. THCCOOH was monitored in negative mode electrospray ionization and multiple reaction monitoring mass spectrometry. The THCCOOH linear range was 12-1,020 pg/mL (R(2) > 0.995). Mean extraction efficiencies and matrix effects evaluated at low and high quality control (QC) concentrations were 40.8-65.1 and -2.4-11.5%, respectively (n = 10). Analytical recoveries (bias) and total imprecision at low, mid, and high QCs were 85.0-113.3 and 6.6-8.4% coefficient of variation, respectively (n = 20). This is the first oral fluid THCCOOH LCMSMS triple quadrupole method not requiring derivatization to achieve a <15 pg/mL limit of quantification. The assay is applicable for the workplace, driving under the influence of drugs, drug treatment, and pain management testing.
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Affiliation(s)
- Karl B Scheidweiler
- Chemistry and Drug Metabolism, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Biomedical Research Center, 251 Bayview Boulevard Suite 200 Room 05A-721, Baltimore, MD 21224, USA
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26
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Oral fluid for the detection of drugs of abuse using immunoassay and LC–MS/MS. Bioanalysis 2013; 5:1555-69. [DOI: 10.4155/bio.13.115] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The utility of oral fluid as a sample matrix for the analysis of drugs has been increasing in popularity over the last few years. This is largely because of collection advantages over other matrices, but also due to the rapid improvements in analytical assays including highly sensitive liquid reagent format enzyme immunoassays and LC–MS/MS. This review will highlight improvements in assay formats, sensitivity, laboratory equipment and sample processing using low sample volumes to expand drug test profiles.
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27
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Fabritius M, Giroud C. Letter to the Editor regarding “Simultaneous determination of ∆9-tetrahydrocannabinol and 11-nor-9-carboxy-∆9-tetrahydrocannabinol in oral fluid using isotope dilution liquid chromatography tandem mass spectrometry”. Anal Bioanal Chem 2012; 405:435-7. [DOI: 10.1007/s00216-012-6515-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Accepted: 10/22/2012] [Indexed: 10/27/2022]
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28
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He X, Kozak M, Nimkar S. Ultra-Sensitive Measurements of 11-Nor-Δ9-Tetrahydrocannabinol-9-Carboxylic Acid in Oral Fluid by Microflow Liquid Chromatography–Tandem Mass Spectrometry Using a Benchtop Quadrupole/Orbitrap Mass Spectrometer. Anal Chem 2012; 84:7643-7. [DOI: 10.1021/ac3019476] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiang He
- ThermoFisher Scientific, 355
River Oaks Parkway, San Jose, California 95134, United States
| | - Marta Kozak
- ThermoFisher Scientific, 355
River Oaks Parkway, San Jose, California 95134, United States
| | - Subodh Nimkar
- ThermoFisher Scientific, 355
River Oaks Parkway, San Jose, California 95134, United States
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29
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Coulter C, Garnier M, Moore C. Analysis of Tetrahydrocannabinol and its Metabolite, 11-Nor- 9-Tetrahydrocannabinol-9-Carboxylic Acid, in Oral Fluid using Liquid Chromatography with Tandem Mass Spectrometry. J Anal Toxicol 2012; 36:413-7. [DOI: 10.1093/jat/bks039] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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