“A liquid chromatography-tandem mass spectrometry single-laboratory validation was performed for the detection and quantification of the 10 major cannabinoids of cannabis, namely, (-)-trans-Δ⁹-tetrahydrocannabinol, cannabidiol, cannabigerol, cannabichromene, tetrahydrocannabivarian, cannabinol, (-)-trans-Δ⁸-tetrahydrocannabinol, cannabidiolic acid, cannabigerolic acid, and Δ⁹-tetrahydrocannabinolic acid-A, in the root extract of Cannabis sativa. Acetonitrile : methanol (80 : 20, v/v) was used for extraction; d₃-cannabidiol and d₃– tetrahydrocannabinol were used as the internal standards. All 10 cannabinoids showed a good regression relationship with r² > 0.99. The validated method is simple, sensitive, and reproducible and is therefore suitable for the detection and quantification of these cannabinoids in extracts of cannabis roots. To our knowledge, this is the first report for the quantification of cannabinoids in cannabis roots.” https://www.ncbi.nlm.nih.gov/pubmed/29359294 https://www.thieme-connect.de/DOI/DOI?10.1055/s-0044-100798