Raw flavonoid was extracted from Pteridium aquilinum (L.) by using 70% alcohol, followed by purification with polyamide to obtain refined flavonoid.

• 用体积分数为70%25的乙醇提取蕨菜黄酮类化合物,得到粗黄酮,经聚酰胺纯化,得到精制黄酮。