Bauhinia is rich in south China. The extract of bauhinia is a anthocyanin compound, which has the functions of clearing heat and cooling blood, dispelling wind and detoxifying, coloring and inhibiting myopia.

Macroporous adsorption resin has the advantages of stable physical and chemical properties, insoluble in acid, alkali and organic solvents, good selectivity, free from the influence of inorganic salts, mild desorption, simple regeneration, long service life and so on.