Uighur medicine brassica campestris polysaccharide as well as extraction method and application thereof

The invention discloses an Uighur medicine brassica campestris polysaccharide as well as an extraction method and application thereof. The invention definitely discloses a structure formula of the brassica campestris polysaccharide and a method for preparing the brassica campestris polysaccharide. The method comprises the steps of degreasing petroleum ether, performing reflux extraction and performing separation and purification through an anion exchange column and a gel chromatography column. The prepared brassica campestris polysaccharide has an excellent immunoregulatory curative effect. In the prepared brassica campestris polysaccharide, the effective constituents of brassica campestris are more clear and definite; the preparation method is simple; the pharmacology is clearer; the dosage of the brassica campestris polysaccharide in the field of medicine is more accurate; the pharmacological effect is easily controlled; a basis is supplied for the synthesis of the brassica campestris polysaccharide; the br