Ther Drug Monit. 2026 Jan 28. doi: 10.1097/FTD.0000000000001399. Online ahead of print.
ABSTRACT
BACKGROUND: With the patchwork legalization of cannabis in the United States and the loopholes surrounding “legal” highs, the prevalence of Δ8-tetrahydrocannabinol (Δ8-THC) has been rising, requiring the development of methods to extract, differentiate, and detect it separately from Δ9-tetrahydrocannabinol (Δ9-THC) and its metabolites. The authors focused on developing a method to detect the primary metabolite Δ8-carboxy-tetrahydrocannabinol (Δ8-THC-COOH) separately from Δ9-carboxy-tetrahydrocannabinol (Δ9-THC-COOH) in urine, a commonly collected sample in human performance toxicology.
METHODS: Liquid-liquid extraction with hydrolysis was used to isolate and extract metabolites from forensic urine samples. After evaporation, the extract was flash-derivatized using an MTBSTFA:ACN (1:3) solution, followed by gas chromatography-mass spectrometry analysis. The results were tabulated and subjected to statistical analysis.
RESULTS: Forensic human performance urine specimens (n = 127) were analyzed for ∆8-THC-COOH, ∆9-THC-COOH, and 7-carboxy-cannabidiol (7-COOH-CBD) between January 2023 and January 2024. In total, 52 samples contained only ∆9-THC-COOH, 70 contained both ∆8-THC-COOH and ∆9-THC-COOH, 3 contained only ∆8-THC-COOH, and 5 contained both 7-COOH-CBD and ∆9-THC-COOH, with 3 of these containing all 3 metabolites. The area abundances of their respective chromatographic peaks was used to calculate the ∆8:∆9 metabolite ratio when both ∆8-THC-COOH and ∆9-THC-COOH were detected. Despite a higher mean ratio in driving under the influence cases (13.87 versus 8.53), the difference between the mean values was not statistically significant (independent-sample t test: t (68) = -0.670, p = 0.505).
CONCLUSIONS: This study and its methodology provide insight into the effective separation and analysis of the compounds of interest, and discuss the potential differentiation of ∆8-THC-dominant products from traditional cannabis, and underscore the prevalence of ∆8-THC and ∆8-THC-dominant products in the current market, while highlighting the need for further studies on this topic.
PMID:41604141 | DOI:10.1097/FTD.0000000000001399