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TOC & THC determination
For TOC THC determination, the standard method is a four-step procedure based on a high-performance liquid chromatography (HPLC) technique. This methodology involves the separation of cannabinoids using a two-dimensional gel and the addition of an isotope of phenprocoumon. The resulting ratios are standardized and can be used for a variety of applications. To achieve a more precise and accurate TOC THC determination, the GC/MS method must be used.
The TOC method for cannabis THC determination is based on a gas chromatographic separation. In order to obtain the maximum separation, the target analytes must be separated by two different methods. In this study, IS was separated from all other cannabinoids using the HPLC/MS method. In this study, a UHPLC system coupled to a diode array detector was used. The column chemistry used was identical to the HPLC column and the mobile phase was acetic acid. The injection volume was reduced to 5 mL. Moreover, the chromatograms were correlated with the reference standard.
The HPLC method was adapted for forensic cannabis testing. During the separation, IS was separated from all other cannabinoids using a solvent-free, two-step HPLC system. The developed HPLC procedure was then transferred to an UHPLC system coupled to a diode array detector. The chemistry of the stationary phase and mobile phase used were identical. The injection volume was reduced to 5 mL. The target analytes were separated in under five minutes. The resolution of all peaks was higher than 1.5 and asymmetry was between 0.9 and 1.1.
For TOC THC determination, a highly-sensitive spectrophotometer was used to compare THC and THCA levels. This method uses a column oven whose temperature was set at 50 degrees Celsius. The flow rate was 0.8 mL/min. The spectrophotometric response was monitored at l = 220 nm. This method has a low recovery factor, but has high sensitivity.
The extraction method combines multiple methods and is compatible with a wide range of products. To calculate THC concentrations, the cannabinoids of a cannabis sample were subjected to a series of tests, including an oven stability tests. The results were comparable between the control and TOC THC. A controlled comparison was also conducted to test the levels of the two cannabinoids. To obtain THC concentrations, the results were obtained by a single-step chromatography and a multi-step extraction.
After the extraction of the plant samples, the concentration of the eight cannabinoids was compared to the standard. The ratio of CBG to THC was higher in the test of THC, while CBD showed a higher yield than in the control sample. However, the results for the extracts were inconsistent. The methods used for the TOC THC determination were not compatible with the standards. The accuracy of the method is very low, and it was not possible to compare the results with the reference test.