The percentage rate of change into cannabinoids (Cannabidiol [CBD], tetrahydrocannabinol [THC] and cannabinol [CBN]) was higher in cannabis samples than in the extracts. This is probalby due to the decomposition of acids into corresponding neutral cannabinoids under the conditions of storage. Previous claims that CBD content in plant material is relatively constant are not substantiated by our results. There was a 1.0-2.5-fold increase in CBD content in plant material compared with the extracts. However, the fact that there was no appreciable increase in CBD/CBN content in the stored extracts of the same samples supports the view that the step-wise extraction does not bring the acids into the final extract pure delta 9THC decomposed at a rate of 41 per cent per year under tropical storage conditions. The delta 9THC content decreased in the samples and equally in the extracts though 100 per cent conversion of THC to CBN does not take place. The higher CBN content found in extracts than that expected by the conversion THC to CBN is a result of metabolic conversion.
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