|Other names||2-Carboxy-THC; THCA, 2-COOH-THC|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||358.478 g·mol−1|
|3D model (JSmol)|
THCA is found in variable quantities in fresh, undried cannabis, but is progressively decarboxylated to THC with drying, and especially under intense heating such as when cannabis is smoked or cooked into cannabis edibles. THCA is often the majority constituent in cannabis resin concentrates, such as hashish and hash oil, when prepared from high-THC cannabis plant material, frequently comprising between 50% and 90% by weight.
Conversion of THCA to THC in vivo appears to be very limited, giving it only very slight efficacy as a prodrug for THC. In receptor binding assays it is promiscuous; there are papers showing it being an inhibitor of PC-PLC, COX-1, COX-2, TRPM8, TRPV1, FAAH, NAAA, MGL, and DGLα, and an inhibitor of anandamide transport, as well as an agonist of TRPA1 and TRPV2. Many THCA reagents used in biochemistry experiments are contaminated with THC due to THCA's instability.
A study found THCA and unheated Cannabis sativa extracts exert immuno-modulating effect, not mediated by the cannabinoid CB1 and CB2 receptor coupled pathways like THC. THCA were able to inhibit the tumor necrosis factor alpha (TNF-alpha) levels in U937 macrophages and peripheral blood macrophages, an inhibition that persisted over a longer period of time, whereas after prolonged exposure time THC and heated extract tend to induce the TNF-alpha level. THCA and THC show distinct effects on phosphatidylcholine specific phospholipase C (PC-PLC) activity, as THCA and unheated extracts inhibit the PC-PLC activity in a dose-dependent manner, but THC only induced PC-PLC activity at high concentrations, suggest THCA and THC exert their immuno-modulating effects via different metabolic pathways.
The anti-inflammatory activity of C. sativa extracts was studied on three lines of epithelial cells and on colon tissue in a model of inflammatory bowel diseases (IBDs), where C. sativa flowers were extracted with ethanol, found the anti-inflammatory activity of Cannabis extracts derives from THCA present in fraction 7 (F7) of the extract. However, all fractions of C. sativa at a certain combination of concentrations show a significant increased cytotoxic activity and suppress COX-2 and MMP9 gene expression in both cell culture and colon tissue, suggest the anti-inflammatory activity of Cannabis extracts on colon epithelial cells derives from a fraction of the extract that contains THCA, and is mediated, at least partially, via GPR55 receptor. The cytotoxic activity of the C. sativa extract was increased by combining all fractions at a certain combination of concentrations and was partially affected by CB2 receptor antagonist that increased cell proliferation, why it is suggested that in a nonpsychoactive treatment for IBD, THCA should be used rather than CBD.
THCA show a similar metabolism as THC in humans, producing 11-OH-THCA and 11-nor-9-car-boxy-THCA. Although the decarboxylation of THCA to THC was assumed to be complete, which means that no THCA should be detectable in urine and blood serum of cannabis consumers, it is found in the urine and blood serum samples collected from police controls of drivers, suspected for driving under the influence of drugs (DUID). THCA was detected in the urine and blood serum samples of several cannabis consumers in concentrations of up to 10.8 ng/ml in urine and 14.8 ng/ml in serum. The concentration of THCA was below the THC concentration in most serum samples, resulting in molar ratios of THCA/THC of approximately 5.0–18.6%. Where a short elapsed time between the last intake and blood sampling was assumed, the molar ratio was 18.6% in the serum.
It has two isomers, THCA-A, in which the carboxylic acid group is in the 1 position, between the hydroxy group and the carbon chain, and THCA-B, in which the carboxylic acid group is in the 3 position, following the carbon chain.:20
In the past THCA was thought to be formed in plants by cyclization of cannabidiolic acid but due to studies in the late 1990s it became apparent that its precursor is cannabigerolic acid, which goes through oxidocyclization through the actions of the enzyme THCA-synthase.:14
It is unstable, and slowly decarboxylates into THC during storage, and the THC itself slowly degrades to cannabinol, found with potential immunosuppressive and anti-inflammatory activities. When heated or burned, as when cannabis is smoked or included in baked goods, the decarboxylation is rapid but not complete; THCA is detectable in people who smoke or otherwise consume cannabis.
THCA is not scheduled at the federal level in the United States, but it is possible that THCA could legally be considered an analog of THC and sales or possession could potentially be prosecuted under the Federal Analogue Act. In practice, because THCA spontaneously decarboxylates to form THC, no real sample of purified THCA will be completely free of THC. Thus, any laboratory analysis of THCA using any technique involving significant heat will generate THC in the handling and analytical process.