Extraction method and content detection method of total phenols of rapeseed oil

The invention discloses a rapeseed oil total phenol extraction method and a rapeseed oil total phenol content detection method, and the extraction method comprises the following steps: 1, weighing rapeseed oil, placing the rapeseed oil in a glass test tube, adding methanol, carrying out vortex oscillation, uniformly mixing, carrying out ultrasonic treatment, and freezing; and 2, transferring the supernatant liquid in the glass test tube to another clean test tube, carrying out weak nitrogen blow-drying in a metal bath, re-dissolving the residue in a methanol-water solution, carrying out vortex oscillation and uniform mixing, and storing for later use. According to the method for extracting the total phenols of the rapeseed oil, methanol dissolution and ultrasonic-assisted extraction are adopted, meanwhile, the rapeseed oil and an extracting solution are well separated through freezing, an organic solvent extraction method and an ultrasonic-assisted extraction method are combined, the extraction time is greatl