The Journal of Analytical Toxicology

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Δ9-Tetrahydrocannabinol Content of Commercially Available Hemp Products

Δ9-Tetrahydrocannabinol Content of Commercially Available Hemp Products

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Authors: Justin M. Holler1, Thomas Z. Bosy2, Christopher S. Dunkley1, Barry Levine1, Marilyn R. Past1, and Aaron Jacobs3
1Division of Forensic Toxicology, The Armed Forces Medical Examiner System, Armed Forces Institute of Pathology, Rockville, Maryland 20850; 2Navy Drug Screening Laboratory, Bldg. H2033, Naval Air Station, Jacksonville, Florida 32212; and 3Air Force Medical Operations Agency, Brooks City-Base, Texas 78235

Δ9-Tetrahydrocannabinol (THC) is the main psychoactive compound present in marijuana. THC can also be found, as a contaminant, in some commercially available hemp products marketed in health food stores and on the internet as a good source of essential fatty acids. The products range from oil to alcoholic beverages to nutritional bars to candies, with oil being the most popular and commonly available. The analytical results are separated into two groups, products tested prior to and after publication of 21 CFR Part 1308, “clarification of listing of tetrahydrocannabinols.” The data presented are a summary of 79 different hemp products tested for THC. THC was separated by a liquid-liquid or solid-liquid extraction, depending upon the product matrix. THC concentrations range from none detected to 117.5 µg THC/g material. Typical limits of detection for the assay (depending on matrix) are 1.0–2.5 µg THC/g material. Products that were of aqueous base (beer, tea) had much lower limits of detection (2.5 µg/mL). No THC was detected in 58% of the products from group 1 and 86% of the products from group 2. The amounts indicate that THC levels in currently marketed hemp products are significantly lower than in those products available before 2003 and reported in previous studies. The results reported here may be used as a general guideline for the THC content of hemp products recently found in the marketplace today.

Journal of Analytical Toxicology, July/August 2008, Volume 32, Number 6, pages 428-432.

Reproduction (photocopying) of editorial content without publisher's permission is prohibited.


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