The content of product can increased to 40% by direct extraction for 3 times with ethyl acetate and successive extraction for 4 times with aether from sample solution of Echinacea purpurea extract(pH3).

• pH3的原料液直接用乙酸乙酯萃取3次和乙醚萃取4次可以得到纯度40%25左右的产品,两步萃取收率都在90%25以上。