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Development of rapid and simple method for DNA extraction from cannabis resin based on the evaluation of relative PCR amplification ability.
Forensic Science International 2018 June
In recent years, analysis of cannabis DNA has been increasingly used in forensic drug tests. However, in the case of cannabis resin, a processed marijuana product, complicated procedures are required for the extraction of clean DNA, as the presence of various impurities inhibits PCR amplification. Therefore, in this study, we attempted to identify the factors that would allow quick and simple DNA extraction from cannabis resin with a commercially available kit. We also constructed a simple assay system for comparing relative amplification efficiencies by end-point PCR and used it to evaluate the purity of the obtained DNA solutions. For extraction with a kit that contains a silica column, reducing the starting amount of resin, using the residue remaining after methanol extraction, dilution of the final solution, extraction with an equal amount of powdered activated carbon or an excess amount of polyvinylpolypyrrolidone, and the addition of an appropriate amount of polyvinylpyrrolidone to the solution after extraction were effective measures that improved amplification efficiency. Furthermore, the use of the most rapid alkaline extraction kit combined with the addition of powdered activated carbon allowed obtaining DNA solutions with sufficient amplification efficiency in about 10min. These findings should be useful for routine DNA analysis of cannabis resin during forensic examination.
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