Tannin has been extracted from acer truneatum bunge with the mixed solvent of acetone/water and its cationic modification has been carried on with formaldehyde,dimethylamine and chlorbenzyl.

• 采用丙酮-水的混合液提取元宝枫翅果中单宁,再利用甲醛、二甲胺和氯化苄对提取的单宁进行阳离子改性。