Comprehensive analysis of synthetic cannabinoids and metabolites in oral fluid by online solid-phase extraction coupled
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RESEARCH PAPER
Comprehensive analysis of synthetic cannabinoids and metabolites in oral fluid by online solid-phase extraction coupled to liquid chromatography-triple quadrupole-mass spectrometry Carmen T. Mulet 1,2 & Anamary Tarifa 1,2 & Anthony P. DeCaprio 1,2 Received: 2 June 2020 / Revised: 13 August 2020 / Accepted: 28 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The class of novel psychoactive substances known as synthetic cannabinoids (SC) includes illicit compounds that are sprayed on plant material and smoked or sold as liquids to be vaporized in e-cigarettes. In toxicological analysis of SC, fast analytical methods are needed for the detection and confirmation of parent drugs and metabolites at very low levels. While various analytical methods have been developed for SC in blood and urine, few are available for alternative matrices such as oral fluid (OF). There are numerous advantages to using OF as a sample matrix for SC analysis, including non-invasive collection, lesser risk of adulteration, and presence of both parent drug and metabolites. Here we report a validated online solid-phase extraction (online SPE) method coupled to LC-QqQ-MS for rapid confirmation and quantitation of 72 structurally diverse SC parent drugs and metabolites in OF with 2.5 min of preconcentration time and a total elution time of < 10 min. The use of online SPE for sample pretreatment facilitates rapid and consistent processing and greatly increases sample throughput. The method was fully validated according to relevant guidelines (ANSI/ASB Standard 036). Bias and precision values were within ± 20% for all compounds in human OF matrix. Method detection and quantitation limits ranged from 0.4 to 3.8 ng/mL and from 1.1 to 11.6 ng/mL, respectively. Recovery, matrix effects, process efficiency, carryover, and stability were also within acceptable limits for the majority of compounds. Successful application of the method was demonstrated using blank human OF fortified with SC in addition to a set of authentic OF specimens previously tested by another laboratory. Keywords Method validation . Synthetic cannabinoids . Metabolites . Oral fluid . Online SPE . LC-QqQ-MS
Introduction “K2,” “Spice,” and “Black Mamba” are just some of the commonly referred to street names for the abused class of novel psychoactive substances (NPS) known as synthetic cannabinoids (SC) [1]. The attraction for these drugs, often by teenagers and young adults, is that they are marketed as “cheap, synthetic marijuana” that cannot be detected by traditional Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00216-020-02926-9) contains supplementary material, which is available to authorized users. * Anthony P. DeCaprio [email protected] 1
Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th Street, OE-116, Miami, FL 33199, USA
2
International Forensic Research Institute, Florida International University, 11200 SW 8th Street, OE-116, Miami, FL 3
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