Mass spectrometry of cannabinoids

Area of Science:

• Analytical Chemistry
• Organic Chemistry
• Mass Spectrometry

Background:

• Cannabinoids are complex molecules with diverse pharmacological effects.
• Understanding cannabinoid fragmentation is crucial for accurate identification and quantification.
• Previous studies have explored cannabinoid mass spectrometry but detailed fragmentation mechanisms require further elucidation.

Purpose of the Study:

• To elucidate the fragmentation mechanisms of various cannabinoids.
• To identify key fragment ions and their formation pathways.
• To establish a comprehensive understanding of cannabinoid fragmentation for analytical applications.

Main Methods:

• Gas-liquid chromatography-mass spectrometry (GLC-MS) was employed for analysis.
• A range of cannabinoids were analyzed, including cannabidiol, cannabinol, and tetrahydrocannabinol isomers.
• Fragmentation was studied using varying electron energies during GLC elution.

Main Results:

• Specific fragmentation pathways were identified, including methyl radical loss, ring closure, McLafferty rearrangement, and retro Diels-Alder reactions.
• Key fragment ions observed were m/e 314, 299, 271, 258, 246, 243, and 231.
• Isomer-specific fragmentation patterns were observed, aiding in structural differentiation.

Conclusions:

• The study provides a detailed mechanistic understanding of cannabinoid fragmentation.
• GLC-MS is a powerful tool for analyzing complex cannabinoid mixtures.
• The identified fragmentation pathways enhance the reliability of cannabinoid identification and analysis.