Consumption and quantitation of delta9-tetrahydrocannabinol in commercially available hemp seed oil products
Bosy TZ, Cole KA.
Division of Forensic Toxicology,
Armed Forces Institute of Pathology,
Rockville, Maryland 20850-3125, USA.
J Anal Toxicol. 2000 Oct;24(7):562-6


There has been a recent and significant increase in the use and availability of hemp seed oil products. These products are being marketed as a healthy source of essential omega fatty acids when taken orally. Although the health aspects of these oils is open to debate, the probability that oils derived from the hemp seed will contain delta9-tetrahyrdocannabinol (THC) is noteworthy. Recent additions to the literature cite a number of studies illustrating that the ingestion of these products results in urinary levels of the THC metabolite, delta9-tetrahyrdocannabinol carboxylic acid (THCA), well above the administrative cutoff (50 ng/mL) used during random drug screens. Testing performed by our laboratory found that the concentration of THC in hemp oil products has been reduced considerably since the publication of earlier studies. The purpose of this study is to quantitate the THC levels in commercially available hemp oils and to administer those oils tested to THC-free volunteers to determine urine metabolite levels following several 15-g doses. Two extraction protocols were evaluated for removing THC from the oil matrix: a single step liquid-liquid extraction was compared to a two-phase process using both liquid-liquid and solid-phase techniques. Gas chromatography-mass spectrometry was used to determine THC levels in several products: four from Spectrum Essentials (3 bottled oils and 1-g capsules), two from Health from the Sun (1-g capsules and bottled oil) oils, and single samples of both Hempstead and Hempola hemp oils. These hemp oil products contained THC concentrations of 36.0, 36.4, 117.5, 79.5, 48.6, 45.7, 21.0, and 11.5 mg/g, respectively. The Abbott AxSYM FPIA and Roche On-Line KIMS immunoassays were used to screen the urine samples, and GC-MS was used to determine the amount of THC in each oil as well as confirm and quantitate THCA in the urine of study participants immediately before and 6 h after each dose. Peak THCA levels in the participants' urine ranged from 1 to 49 ng/mL. All volunteers were below positive screen and confirmation cutoffs within 48 h after cessation of ingestion.

Just say know
Tolerant mice
Forgetful rodents
Stoned as a newt?
The nectar of delight
Charas versus bhang squirrel monkeys

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15


Future Opioids
BLTC Research
Utopian Pharmacology
The Hedonistic Imperative
When Is It Best To Take Crack Cocaine?

swan image
The Good Drug Guide
The Responsible Parent's Guide
To Healthy Mood Boosters For All The Family