Identification of Cannabinoids in Baked Goods by UHPLC/MS

Importance of the Topic

Accurate detection of cannabinoids in complex food matrices such as baked goods is crucial for forensic investigations and regulatory compliance. Traditional GC/MS methods face challenges due to labor-intensive derivatization steps and matrix interferences. UHPLC/MS offers a streamlined alternative with faster analysis and minimal sample preparation, enhancing throughput and reliability in forensic laboratories.

Goals and Study Overview

The study aims to develop and validate a rapid, sensitive UHPLC/MS method to positively identify trace levels of three key cannabinoids—Δ9-tetrahydrocannabinol (THC), cannabidiol, and cannabinol—in baked goods. By simplifying sample preparation and eliminating derivatization, the authors seek to improve analytical efficiency in a forensic context.

Methodology

Standard solutions of THC, cannabidiol, and cannabinol (10 ppm) were prepared in methanol. Baked-good samples (brownies and cookies) were extracted by vortexing 25 mg of material with 2 mL methanol, followed by filtration and centrifugation. The final extract was diluted 50-fold before analysis.

Used Instrumentation

• UHPLC System: Accela™ UHPLC (Thermo Fisher Scientific)
• Chromatographic Column: Hypersil GOLD™ PFP, 100 × 2.1 mm, 1.9 µm
• Mobile Phase: Water, acetonitrile, and methanol each with 0.06% acetic acid, gradient elution
• Mass Spectrometer: MSQ Plus™ single quadrupole with electrospray ionization (ESI+) and full-scan (50–500 m/z)

Main Results and Discussion

Baseline separation of cannabidiol (4.1 min), THC (5.1 min), and cannabinol (5.4 min) was achieved within an 8-minute run. Extracted ion chromatograms demonstrated clear detection at expected m/z values (315 for cannabidiol and THC; 311 for cannabinol). Case samples confirmed method applicability: the known THC-containing brownie yielded a distinct peak at 5.1 min, while aged cookie extracts showed degraded signal recoverable by increasing injection volume. No carryover was observed between runs.

Benefits and Practical Applications

This UHPLC/MS method reduces sample preparation time (<10 min) and eliminates chemical derivatization, significantly decreasing instrument maintenance. Its sensitivity and speed make it ideal for high-throughput forensic and QA/QC laboratories charged with screening food products for cannabinoid content.

Future Trends and Potential Applications

Future developments may include high-resolution mass spectrometry for improved specificity, automated sample workflows to further enhance throughput, and adaptation to a wider range of food matrices. Emerging miniaturized UHPLC/MS systems could facilitate on-site testing and real-time forensic analyses.

Conclusion

The validated UHPLC/MS approach provides a rapid, robust solution for identifying trace cannabinoids in baked goods. By streamlining extraction and analysis, it offers forensic laboratories an efficient alternative to traditional GC/MS, ensuring reliable results with minimal matrix interference.