FOOD SCIENCE 93
TESTING CANNABIS
POTENCY in edibles
Danielle Mackowsky reports on an efficient approach to testing the potency of cannabis in food products
A
s of July 2015, in the USA, 23 states and Washington D.C.
Legalising marijuana in certain US states has led to the need for uniform testing policies
have legalised the medical use of marijuana, while four states and Washington D.C. have legalised the recreational use of marijuana. As a result, many forensic toxicology labs are looking for fast, reliable and cost- effective methods to determine cannabis potency and pesticides in edibles. Although the pros and cons of legalisation are still heavily debated throughout the country, all scientists agree that uniform testing policies and procedures need to be established as soon as possible. Within environmental and food testing laboratories, the use of QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) has been in wide practice for the past 15 years. In 2003,
Drs Michelangelo Anastassiades and Steven Lehotay published the first QuEChERS application, which discussed the determination of pesticide residues in produce. Since then, QuEChERS has become the gold standard for the testing and analysis of a wide variety of edible matrices. UCT was the first company to commercialise this product and it became apparent that the application of this technology to the marijuana edible industry was a natural solution to the problem.
Sample preparation Preparation of a sample for QuEChERS analysis varies depending on the type of edible being tested. Baked goods, chocolate bars and hard candies should all be ground into a fine powder prior to analysis.
Although this can be achieved using a product such as a SPEX 6770 freezer mill, a blender can suffice when analysing typical plant based samples. Liquid samples, such as sodas or teas, should be degassed prior to analysis, whereas any gummy- based candies should be cut into fine pieces. With the exception of the liquid samples, all other matrices should then be hydrated for one hour within the provided QuEChERS extraction tube. Following sample preparation, acetonitrile is added to all samples along with a proprietary blend of QuEChERS extraction salts. Tese salts remove water from the organic phase, help to facilitate solvent partitioning and protect base-sensitive analytes from degradation. After shaking and centrifuging the sample, three distinct layers are formed. Te
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