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Irawan A, Muchiri RN, Parker NB, van Breemen RB, Ates S, Bionaz M. Cannabinoid residuals in tissues of lambs fed spent hemp biomass and consumer's exposure assessment. Food Chem Toxicol 2024; 191:114848. [PMID: 38971552 DOI: 10.1016/j.fct.2024.114848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2024] [Revised: 07/03/2024] [Accepted: 07/03/2024] [Indexed: 07/08/2024]
Abstract
Spent hemp biomass (SHB) contains trace amounts of cannabinoids, including Δ9-tetrahydrocannabinol (Δ9-THC), that may accumulate in the tissues of animals consuming SHB. We measured cannabinoid residues in the liver, adipose tissue, and muscle of finishing lambs fed either 10% or 20% SHB for 8 weeks, or 4 weeks followed by 4 weeks SHB withdrawal. We detected multiple cannabinoids in the liver at a similar proportion to the SHB. However, CBD and Δ9-THC were enriched >20-fold in the adipose and muscle, compared to their proportion in SHB. The highest concentration of Δ9-THC was detected in adipose tissue and was 7.4-times higher than in muscle. Most cannabinoids were undetectable in tissues after 4 weeks of clearance. The consumers' exposure assessment on Δ9-THC revealed tissue levels of total THC (THCA+Δ9-THC) that exceed the acute reference dose of 1 μg/kg BW across population groups. When consuming meat from the lambs fed 10% and 20% SHB, the maximum total THC exposure was 2.03 and 7.32 μg/kg BW, respectively, equal to or below the Lowest Observed Adverse Effect Level of 36 μg/kg BW, the No Observed Adverse Effect Level of 12 μg/kg BW or a tolerable dose intake of 7 μg/kg BW.
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Affiliation(s)
- Agung Irawan
- Department of Animal and Rangeland Sciences, Oregon State University, Corvallis, 97331, USA; Universitas Sebelas Maret, Surakarta, Central Java 57126, Indonesia
| | - Ruth N Muchiri
- Department of Pharmaceutical Sciences, Linus Pauling Institute, Oregon State University, Corvallis, 97331, USA
| | - Nathan B Parker
- Department of Animal and Rangeland Sciences, Oregon State University, Corvallis, 97331, USA
| | - Richard B van Breemen
- Department of Pharmaceutical Sciences, Linus Pauling Institute, Oregon State University, Corvallis, 97331, USA
| | - Serkan Ates
- Department of Animal and Rangeland Sciences, Oregon State University, Corvallis, 97331, USA.
| | - Massimo Bionaz
- Department of Animal and Rangeland Sciences, Oregon State University, Corvallis, 97331, USA.
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2
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Swaminathan M, Tarifa A, DeCaprio AP. Development and validation of a method for analysis of 25 cannabinoids in oral fluid and exhaled breath condensate. Anal Bioanal Chem 2024; 416:4325-4340. [PMID: 38864915 DOI: 10.1007/s00216-024-05369-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2024] [Revised: 05/23/2024] [Accepted: 05/27/2024] [Indexed: 06/13/2024]
Abstract
Currently, there is a significant demand in forensic toxicology for biomarkers of cannabis exposure that, unlike ∆9-tetrahydrocannabinol, can reliably indicate time and frequency of use, be sampled with relative ease, and correlate with impairment. Oral fluid (OF) and exhaled breath condensate (EBC) are alternative, non-invasive sample matrices that hold promise for identifying cannabis exposure biomarkers. OF, produced by salivary glands, is increasingly utilized in drug screening due to its non-invasive collection and is being explored as an alternative matrix for cannabinoid analysis. EBC is an aqueous specimen consisting of condensed water vapor containing water-soluble volatile and non-volatile components present in exhaled breath. Despite potential advantages, there are no reports on the use of EBC for cannabinoid detection. This study developed a supported liquid extraction approach and LC-QqQ-MS dMRM analytical method for quantification of 25 major and minor cannabinoids and metabolites in OF and EBC. The method was validated according to the ANSI/ASB 036 standard and other published guidelines. LOQ ranged from 0.5 to 6.0 ng/mL for all cannabinoids in both matrices. Recoveries for most analytes were 60-90%, with generally higher values for EBC compared to OF. Matrix effects were observed with some cannabinoids, with effects mitigated by use of matrix-matched calibration. Bias and precision were within ± 25%. Method applicability was demonstrated by analyzing ten authentic OF and EBC samples, with positive detections of multiple analytes in both matrices. The method will facilitate comprehensive analysis of cannabinoids in non-invasive sample matrices for the development of reliable cannabis exposure biomarkers.
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Affiliation(s)
- Meena Swaminathan
- Department of Chemistry & Biochemistry, Florida International University, 11200 SW 8th St., Miami, FL, 33199, USA
| | - Anamary Tarifa
- Department of Chemistry & Biochemistry and Global & Forensic Justice Center, Florida International University, Miami, FL, 33199, USA
| | - Anthony P DeCaprio
- Department of Chemistry & Biochemistry, Florida International University, 11200 SW 8th St., Miami, FL, 33199, USA.
- Department of Chemistry & Biochemistry and Global & Forensic Justice Center, Florida International University, Miami, FL, 33199, USA.
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3
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Lv M, Zhi Y, Zhou L, Qiao Z, Di B, Liu W, Chen H. Development of new matrix reference materials for quantitative urine analysis in drug tests. Anal Bioanal Chem 2024; 416:1427-1441. [PMID: 38270632 DOI: 10.1007/s00216-024-05142-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 01/08/2024] [Accepted: 01/09/2024] [Indexed: 01/26/2024]
Abstract
Accurate quantitative analyses require standardized methods to control and improve the analytical process in the laboratory. The availability of urine reference materials (RMs) may offer a feasible option to improve the accuracy of urine analysis and to control matrix effects. This paper presents the complete process of the development of matrix RMs in urine, including sample preparation, homogeneity, and stability studies, as well as uncertainty assessment. A freeze-drying process was developed, and freeze-dried human and pig urine samples were prepared and verified to have comparable homogeneity to liquid samples and higher stability than liquid human, pig, and artificial urine samples at 4℃ or room temperature and under extreme conditions. A total of 21 authentic urine samples from August 2022 were measured with freeze-dried RMs and spiked urine samples, and the reliability of the quantification of the RMs was compared. The freeze-dried human urine matrix RM appeared to be an excellent tool for daily quality control, as it showed high stability and gave the most consistent results with spiked samples.
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Affiliation(s)
- Min Lv
- Department of Forensic Toxicology, Shanghai Key Laboratory of Forensic Medicine, Academy of Forensic Science, No. 1347, Guangfu West Road, Putuo District, Shanghai, 200063, China
- School of Pharmacy, China Pharmaceutical University, No. 639, Longmian Avenue, Jiangning District, Nanjing, 211198, China
| | - Yujie Zhi
- Department of Forensic Toxicology, Shanghai Key Laboratory of Forensic Medicine, Academy of Forensic Science, No. 1347, Guangfu West Road, Putuo District, Shanghai, 200063, China
- School of Pharmacy, China Pharmaceutical University, No. 639, Longmian Avenue, Jiangning District, Nanjing, 211198, China
| | - Liying Zhou
- Department of Forensic Toxicology, Shanghai Key Laboratory of Forensic Medicine, Academy of Forensic Science, No. 1347, Guangfu West Road, Putuo District, Shanghai, 200063, China
| | - Zheng Qiao
- Department of Forensic Toxicology, Shanghai Key Laboratory of Forensic Medicine, Academy of Forensic Science, No. 1347, Guangfu West Road, Putuo District, Shanghai, 200063, China
| | - Bin Di
- School of Pharmacy, China Pharmaceutical University, No. 639, Longmian Avenue, Jiangning District, Nanjing, 211198, China
| | - Wei Liu
- Department of Forensic Toxicology, Shanghai Key Laboratory of Forensic Medicine, Academy of Forensic Science, No. 1347, Guangfu West Road, Putuo District, Shanghai, 200063, China
| | - Hang Chen
- Department of Forensic Toxicology, Shanghai Key Laboratory of Forensic Medicine, Academy of Forensic Science, No. 1347, Guangfu West Road, Putuo District, Shanghai, 200063, China.
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4
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Koch N, Jennotte O, Lechanteur A, Deville M, Charlier C, Cardot JM, Chiap P, Evrard B. An Intravenous Pharmacokinetic Study of Cannabidiol Solutions in Piglets through the Application of a Validated Ultra-High-Pressure Liquid Chromatography Coupled to Tandem Mass Spectrometry Method for the Simultaneous Quantification of CBD and Its Carboxylated Metabolite in Plasma. Pharmaceutics 2024; 16:140. [PMID: 38276510 PMCID: PMC10820640 DOI: 10.3390/pharmaceutics16010140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Revised: 01/12/2024] [Accepted: 01/18/2024] [Indexed: 01/27/2024] Open
Abstract
Cannabidiol (CBD) has multiple therapeutic benefits that need to be maximized by optimizing its bioavailability. Numerous formulations are therefore being developed and their pharmacokinetics need to be studied, requiring analytical methods and data from intravenous administration. As CBD is susceptible to hepatic metabolism, the requirement of any method is to quantify metabolites such as 7-COOH-CBD. We demonstrated that CBD and 7-COOH-CBD could be simultaneously and correctly quantified in piglet plasma by using an UHPLC-MS/MS technique. The validated method allowed for an accurate bioanalysis of an intravenously injected solution consisting of CBD-HPβCD complexes. The experimental pharmacokinetic profile of CBD showed multi-exponential decay characterized by a fast apparent distribution half-life (0.25 h) and an elimination half-life of two hours. The profile of 7-COOH-CBD was not linked with the first-pass metabolism, since 80% of the maximum metabolite concentration was reached at the first sampling time point, without any decrease during the period of study. A two-compartment model was optimal to describe the experimental CBD profile. This model allowed us to calculate macro-micro constants and volumes of distribution (Vss = 3260.35 ± 2286.66 mL) and clearance (1514.5 ± 261.16 mL·h-1), showing that CBD is rapidly distributed to peripheral tissues once injected and slowly released into the bloodstream.
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Affiliation(s)
- Nathan Koch
- Laboratory of Pharmaceutical Technology and Biopharmacy, Center for Interdisciplinary Research on Medicines (CIRM), University of Liège, 4000 Liège, Belgium; (O.J.); (A.L.); (B.E.)
| | - Olivier Jennotte
- Laboratory of Pharmaceutical Technology and Biopharmacy, Center for Interdisciplinary Research on Medicines (CIRM), University of Liège, 4000 Liège, Belgium; (O.J.); (A.L.); (B.E.)
| | - Anna Lechanteur
- Laboratory of Pharmaceutical Technology and Biopharmacy, Center for Interdisciplinary Research on Medicines (CIRM), University of Liège, 4000 Liège, Belgium; (O.J.); (A.L.); (B.E.)
| | - Marine Deville
- Department of Toxicology, Center for Interdisciplinary Research on Medicines (CIRM), Academic Hospital of Liège, 4000 Liège, Belgium; (M.D.); (C.C.); (P.C.)
| | - Corinne Charlier
- Department of Toxicology, Center for Interdisciplinary Research on Medicines (CIRM), Academic Hospital of Liège, 4000 Liège, Belgium; (M.D.); (C.C.); (P.C.)
| | | | - Patrice Chiap
- Department of Toxicology, Center for Interdisciplinary Research on Medicines (CIRM), Academic Hospital of Liège, 4000 Liège, Belgium; (M.D.); (C.C.); (P.C.)
| | - Brigitte Evrard
- Laboratory of Pharmaceutical Technology and Biopharmacy, Center for Interdisciplinary Research on Medicines (CIRM), University of Liège, 4000 Liège, Belgium; (O.J.); (A.L.); (B.E.)
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5
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Christodoulou MC, Constantinou MS, Louppis AP, Christou A, Stavrou IJ, Kapnissi-Christodoulou CP. Determination of cannabinoids in human cerumen samples by use of UPLC-MS/MS as a potential biomarker for drug use. J Pharm Biomed Anal 2023; 231:115412. [PMID: 37087774 DOI: 10.1016/j.jpba.2023.115412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 04/19/2023] [Accepted: 04/19/2023] [Indexed: 04/25/2023]
Abstract
A quantitative analytical procedure was developed and validated by the use of Ultra- Performance Liquid Chromatography tandem Mass Spectrometry (UPLC-MS/MS) for the determination of Cannabidiol (CBD), Cannabinol (CBN), Δ9-Tetrahydrocannabinol (Δ9-THC), Cannabichromene (CBC), Cannabigerol (CBG) and 11-Nor- 9- Carboxy- Tetrahydrocannabinol (THC-COOH) in an unconventional biological matrix, cerumen. All the investigated calibration curves were characterized by high correlation values (R2 ≥ 0.9965). The LODs and LOQs ranged from 0.004 to 0.009 μg g-1 and 0.012-0.029 μg g-1, respectively. Intra-assay and inter-assay precision were found to be 0.6-2.5%, and 0.8-2.2%, respectively. All recovery values of cannabinoids, with the use of the optimum cotton swab, at low (0.008 μg g-1 of cerumen), medium (0.037 μg g-1of cerumen) and high (0.16 μg g-1 of cerumen) control levels, were estimated to be above 86%. The method developed here permitted the analysis of real cerumen samples obtained from fourteen cannabis users. In twelve out of fourteen cases, Δ9-THC was found to be positive, while in six cases, three major cannabinoids, CBN, CBG and Δ9-THC were quantified at concentrations 0.02-0.21 μg g-1, 0.01-0.24 μg g-1 and 0.01-4.86 μg g-1, respectively. Subject #8 has the highest amount of the detected substances in both left and right ear, with Δ9-THC at a concentration of 1.85 and 4.86 μg g-1, CBG 0.06 and 0.24 μg g-1, CBN 0.10 and 0.21 μg g-1, respectively. In addition, a detection window for the substances Δ9-Tetrahydrocannabinol, Cannabinol and Cannabigerol, in cerumen, was defined with success. In this case, Δ9-THC reached a maximum detection frame of up to fifteen days after smoking 0.5 g of marijuana cigarette. ANOVA-one-way analysis also indicated that the average earwax production of non-cannabis users differs significantly from the one of cannabis users (p = 0.048, <0.05). On the other hand, no significant difference was noticed between male and female users as the p value exceeded 0.05. In addition, no significant effect was observed on earwax production in regard to age, frequency and the last time of use (p > 0.05). These last three factors proved to have a significant impact on cannabinoids concentrations, since p values were less than 0.05.
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Affiliation(s)
| | - M S Constantinou
- Analytical Department, MC Analysis Centre LTD, 2563 Nicosia, Cyprus
| | - A P Louppis
- Analytical Department, MC Analysis Centre LTD, 2563 Nicosia, Cyprus
| | - A Christou
- Department of Chemistry, University of Cyprus, 1678 Nicosia, Cyprus
| | - I J Stavrou
- Department of Life Sciences, European University Cyprus, 2404 Nicosia, Cyprus
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6
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Antunes M, Barroso M, Gallardo E. Analysis of Cannabinoids in Biological Specimens: An Update. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:2312. [PMID: 36767678 PMCID: PMC9915035 DOI: 10.3390/ijerph20032312] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 01/25/2023] [Accepted: 01/25/2023] [Indexed: 06/18/2023]
Abstract
Cannabinoids are still the most consumed drugs of abuse worldwide. Despite being considered less harmful to human health, particularly if compared with opiates or cocaine, cannabis consumption has important medico-legal and public health consequences. For this reason, the development and optimization of sensitive analytical methods that allow the determination of these compounds in different biological specimens is important, involving relevant efforts from laboratories. This paper will discuss cannabis consumption; toxicokinetics, the most detected compounds in biological samples; and characteristics of the latter. In addition, a comprehensive review of extraction methods and analytical tools available for cannabinoid detection in selected biological specimens will be reviewed. Important issues such as pitfalls and cut-off values will be considered.
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Affiliation(s)
- Mónica Antunes
- CICS-UBI—Health Sciences Research Centre, University of Beira Interior, Avenida Infante D. Henrique, 6201-506 Covilha, Portugal
- Serviço de Química e Toxicologia Forenses, Instituto Nacional de Medicina Legal e Ciências Forenses, Delegação do Sul, Rua Manuel Bento de Sousa 3, 1169-201 Lisboa, Portugal
| | - Mário Barroso
- Serviço de Química e Toxicologia Forenses, Instituto Nacional de Medicina Legal e Ciências Forenses, Delegação do Sul, Rua Manuel Bento de Sousa 3, 1169-201 Lisboa, Portugal
| | - Eugenia Gallardo
- CICS-UBI—Health Sciences Research Centre, University of Beira Interior, Avenida Infante D. Henrique, 6201-506 Covilha, Portugal
- Laboratório de Fármaco-Toxicologia, UBIMedical, Universidade da Beira Interior, EM506, 6200-284 Covilha, Portugal
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7
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Cheng JYK, Hui JWS, Chan WS, So MH, Hong YH, Leung WT, Ku KW, Yeung HS, Lo KM, Fung KM, Ip CY, Dao KL, Cheung BKK. Interpol review of toxicology 2019-2022. Forensic Sci Int Synerg 2022; 6:100303. [PMID: 36597440 PMCID: PMC9799715 DOI: 10.1016/j.fsisyn.2022.100303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Jack Yuk-ki Cheng
- Government Laboratory, Hong Kong Special Administrative Region of China
| | | | - Wing-sum Chan
- Government Laboratory, Hong Kong Special Administrative Region of China
| | - Man-ho So
- Government Laboratory, Hong Kong Special Administrative Region of China
| | - Yau-hin Hong
- Government Laboratory, Hong Kong Special Administrative Region of China
| | - Wai-tung Leung
- Government Laboratory, Hong Kong Special Administrative Region of China
| | - Ka-wai Ku
- Government Laboratory, Hong Kong Special Administrative Region of China
| | - Hoi-sze Yeung
- Government Laboratory, Hong Kong Special Administrative Region of China
| | - Kam-moon Lo
- Government Laboratory, Hong Kong Special Administrative Region of China
| | - Kit-mai Fung
- Government Laboratory, Hong Kong Special Administrative Region of China
| | - Chi-yuen Ip
- Government Laboratory, Hong Kong Special Administrative Region of China
| | - Kwok-leung Dao
- Government Laboratory, Hong Kong Special Administrative Region of China
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8
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Djilali E, Pappalardo L, Posadino AM, Giordo R, Pintus G. Effects of the Storage Conditions on the Stability of Natural and Synthetic Cannabis in Biological Matrices for Forensic Toxicology Analysis: An Update from the Literature. Metabolites 2022; 12:metabo12090801. [PMID: 36144208 PMCID: PMC9501240 DOI: 10.3390/metabo12090801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 08/23/2022] [Accepted: 08/24/2022] [Indexed: 11/24/2022] Open
Abstract
The use and abuse of cannabis, be it for medicinal or recreational purposes, is widely spread among the population. Consequently, a market for more potent and consequently more toxic synthetic cannabinoids has flourished, and with it, the need for accurate testing of these substances in intoxicated people. In this regard, one of the critical factors in forensic toxicology is the stability of these drugs in different biological matrices due to different storage conditions. This review aims to present the most updated and relevant literature of studies performed on the effects of different storage conditions on the stability of cannabis compounds present in various biological matrices, such as blood and plasma, urine, and oral fluids, as well as in alternative matrices, such as breath, bile fluid, hair, sweat, cerumen, and dried blood spots.
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Affiliation(s)
- Elias Djilali
- Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah P.O. Box 26666, United Arab Emirates
| | - Lucia Pappalardo
- Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah P.O. Box 26666, United Arab Emirates
- Correspondence:
| | - Anna Maria Posadino
- Department of Biomedical Sciences, University of Sassari, 07100 Sassari, Italy
| | - Roberta Giordo
- College of Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai P.O. Box 505055, United Arab Emirates
| | - Gianfranco Pintus
- Department of Biomedical Sciences, University of Sassari, 07100 Sassari, Italy
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9
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Detection of Eight Cannabinoids and One Tracer in Wastewater and River Water by SPE-UPLC–ESI-MS/MS. WATER 2022. [DOI: 10.3390/w14040588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The consumption of illicit drugs represents a global social and economic problem. Using suitable analytical methods, monitoring, and detection of different illegal drugs residues and their metabolites in wastewater samples can help combat this problem. Our article defines a method to develop, validate, and practically applicate a rapid and robust analytical process for the evaluation of six naturally occurring cannabinoids (CBG, CBD, CBDV, CBN, THC, THCV), two cannabinoids in acidic form (CBDA, THCA-A), and the major cannabis-related human metabolite (THC-COOH). After SPE offline enrichment, we used a UPLC–ESI-MS/MS system, which permitted the determination of several by-products. Studied matrices were samples of different origins: (i) effluent water from a wastewater treatment plant in the Porto urban area; (ii) environmental water from Febros River, the last left-bank tributary of the Douro River. The multi-residue approach was substantiated and successfully employed to analyze the water samples collected in the above locations. The rapid and precise quantification of nine different cannabinoids in different water samples occurred within nine minutes at the ng L−1 level. The appearance of dozens of ng L−1 of some cannabis secondary metabolites, such as CBD, CBDA, CBN, THCA-A, indicates this plant species’ widespread usage among the general population in the considered area.
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10
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Borden SA, Saatchi A, Palaty J, Gill CG. A direct mass spectrometry method for cannabinoid quantitation in urine and oral fluid utilizing reactive paper spray ionization. Analyst 2022; 147:3109-3117. [DOI: 10.1039/d2an00743f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactive paper spray mass spectrometry mitigates many of the challenges associated with direct cannabinoid measurements, allowing for rapid, reliable and quantitative measurements in oral fluid and in urine at clinically relevant levels.
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Affiliation(s)
- Scott A. Borden
- Applied Environmental Research Laboratories, Department of Chemistry, Vancouver Island University, Nanaimo, BC, Canada
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
| | - Armin Saatchi
- Applied Environmental Research Laboratories, Department of Chemistry, Vancouver Island University, Nanaimo, BC, Canada
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
| | - Jan Palaty
- LifeLabs Medical Laboratories, Burnaby, BC, Canada
| | - Chris G. Gill
- Applied Environmental Research Laboratories, Department of Chemistry, Vancouver Island University, Nanaimo, BC, Canada
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
- Department of Chemistry, Simon Fraser University, Burnaby, BC, Canada
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
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