Identification of human hexahydrocannabinol metabolites in urine.

Schirmer, Willi; Auwärter, Volker; Kaudewitz, Julia; Schürch, Stefan; Weinmann, Wolfgang (2023). Identification of human hexahydrocannabinol metabolites in urine. European journal of mass spectrometry, 29(5-6), pp. 326-337. Sage 10.1177/14690667231200139

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Hexahydrocannabinol (HHC) is a cannabinoid that has been known since 1940 but has only recently found its way into recreational use as a psychoactive drug. HHC has been used as a legal alternative to tetrahydrocannabinol (THC) in many countries, but first countries already placed it under their narcotic substances law. Our aim was to evaluate a reliable analytical method for the proof of HHC consumption by LC-MS/MS and GC-MS. We identified the two epimers of HHC and metabolites after HHC consumption by two volunteers (inhalation by use of a vaporizer and oral intake). LC-HR-MS/MS, LC-MS/MS and GC-MS with literature data (EI-MS spectra of derivatives) and reference compounds - as far as commercially available - were used for metabolite identification. Phase-II-metabolites (glucuronides) of HHC and OH-HHC were found in urine samples with LC-HR-MS/MS and LC-MS/MS. The main metabolite was tentatively identified with GC-MS as 4'OH-HHC (stereochemistry on C9 and C4' unknown). Another major side-chain hydroxylated metabolite found by LC-MS/MS could not be unambiguously identified. Both epimers of 11-OH-HHC were found in considerable amounts in urine. (8R, 9R)-8-OH-HHC was identified as a minor metabolite with GC-MS and LC-MS/MS. While (9S)-HHC was found in urine after oral intake and inhalation of HHC, the more psychoactive epimer (9R)-HHC was only found in urine after inhalation. Several other minor metabolites were detected but not structurally identified. We found that after oral or inhalative consumption the urinary main metabolites of a diastereomeric mixture of HHC are different from the respective, major Δ9-THC metabolites (11-OH-Δ9-THC and 11-nor-9-carboxy-Δ9-THC). Although a sensitive LC-MS/MS and GC-SIM-MS method were set-up for the reference compounds (9R)-11-nor-9-carboxy-HHC and (9S)-11-nor-9-carboxy-HHC, these oxidation products were not detected in urine with these techniques. To further increase sensitivity, a GC-MS/MS method was developed, and the 11-nor-9-carboxy metabolites of HHC were confirmed to be present as minor metabolites.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Service Sector > Institute of Legal Medicine
04 Faculty of Medicine > Service Sector > Institute of Legal Medicine > Forensic Chemistry and Toxicology
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Schirmer, Willi, Schürch, Stefan, Weinmann, Wolfgang


300 Social sciences, sociology & anthropology > 360 Social problems & social services
600 Technology > 610 Medicine & health
500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry








Pubmed Import

Date Deposited:

15 Sep 2023 14:23

Last Modified:

25 Nov 2023 00:14

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Uncontrolled Keywords:

GC-MS GC-MS/MS HHC LC-MS/MS cannabinoid hexahydrocannabinol metabolism


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