The invention relates to a natural
antioxidant extracted from the young leaf of a walnut and an extracting method. After the young leaf of the walnut seed is washed, through
drying or baking, and smashing, the smashed product is added with
ethanol water, and the heat preservation, the circumfluence and the
digestion are performed in the water bath at 40 to 50 DEG C for five hours, filtrate and residue are filtered, separated and collected, and after being extracted by the same method for three times, the filtrate which is decompressed and concentrated with vacuum is incorporated,
ethanol is recycled, a concentrated pasty object is redissolved in
distilled water, the water-insoluble is removed through
centrifugal filtration, the
aqueous solution is extracted by
ethyl acetate for five times, the extract liquor is incorporated, the
ethyl acetate is recycled through being decompressed, concentrated and dried in vacuum, thereby obtaining the concentrated pasty object, the pasty object is dried in vacuum again, thus, a natural
antioxidant extracted from festucine walnut leaves is obtained. The natural
antioxidant extracted from the young leaf of the walnut has better antioxidation, is rich in bioactivators, such as walnut
quinine,
tannin,
flavones, etc., the natural antioxidant is safe and has high efficiency, low production cost, rich extractive materials, and wide application prospect.