Preparation and application of organic selenium flavonoid compound with high antioxidant activity and low toxic and side effects

The invention discloses preparation and application of an organic selenium flavonoid compound with high antioxidant activity and low toxic and side effects, and relates to the technical field of functional foods. The method comprises the following steps: crushing selenium-rich ampelopsis grossedentata, selenium-rich radix puerariae, selenium-rich gastrodia elata and selenium-rich papaya, mixing according to a ratio, carrying out low-temperature reflux extraction, removing impurities by using a hollow fiber ultrafiltration membrane, removing pigments by using activated carbon, removing fat and polysaccharide by using reverse phase silica gel, removing impurities by using gel chromatography, and freezing or spray-drying. The new food resource ampelopsis grossedentata is combined with medicinal and edible traditional Chinese medicinal materials such as radix puerariae, rhizoma gastrodiae and pawpaw to serve as raw materials, the organic selenium flavone compound with the high yield is extracted, the extracted se