Planta Med
DOI: 10.1055/s-0043-119361
Original Papers
Georg Thieme Verlag KG Stuttgart · New York

Evaluation of Cannabinoid and Terpenoid Content: Cannabis Flower Compared to Supercritical CO2 Concentrate

Michelle Sexton1, 2, Kyle Shelton2, 3, Pam Haley4, Mike West5
  • 1Center for the Study of Cannabis and Social Policy, Seattle, WA, USA
  • 2Phytalytics LLC, Kirkland, WA, USA
  • 3Medicine Creek Analytics, Fife, WA, USA
  • 4CO₂ Garden Extracts, Redmond, WA, USA
  • 5Green Lion Farms, Seattle, WA, USA
Further Information

Publication History

received 26 April 2017
revised 17 August 2017

accepted 01 September 2017

Publication Date:
19 September 2017 (eFirst)

Abstract

A recent cannabis use survey revealed that 60% of cannabis users rely on smelling the flower to select their cannabis. Olfactory indicators in plants include volatile compounds, principally represented by the terpenoid fraction. Currently, medicinal- and adult-use cannabis is marketed in the United States with relatively little differentiation between products other than by a common name, association with a species type, and Δ-9 tetrahydrocannabinol/cannabidiol potency. Because of this practice, how terpenoid compositions may change during an extraction process is widely overlooked. Here we report on a comparative study of terpenoid and cannabinoid potencies of flower and supercritical fluid CO2 (SC-CO2) extract from six cannabis chemovars grown in Washington State. To enable this comparison, we employed a validated high-performance liquid chromatography/diode array detector methodology for quantification of seven cannabinoids and developed an internal gas chromatography-mass spectrometry method for quantification of 42 terpenes. The relative potencies of terpenoids and cannabinoids in flower versus concentrate were significantly different. Cannabinoid potency increased by factors of 3.2 for Δ-9 tetrahydrocannabinol and 4.0 for cannabidiol in concentrates compared to flower. Monoterpenes were lost in the extraction process; a ketone increased by 2.2; an ether by 2.7; monoterpene alcohols by 5.3, 7 and 9.4; and sesquiterpenes by 5.1, 4.2, 7.7, and 8.9. Our results demonstrate that the product of SC-CO2 extraction may have a significantly different chemotypic fingerprint from that of cannabis flower. These results highlight the need for more complete characterization of cannabis and associated products, beyond cannabinoid content, in order to further understand health-related consequences of inhaling or ingesting concentrated forms.

Supporting Information