Methods:1 The Equisetum was cut into pieces and extracted by different solvents, including distilled water and n-butano.

• 取木贼用蒸馏水1：100回流提取得木贼水煎剂，水煎剂用正丁醇萃取，正丁醇液回收至干，用蒸馏水定容至1.；25g/ml(正丁醇提取物)，作为灌胃溶液；