Method for extracting treatment ingredients for gastrointestinal diseases from bark of liriodendron tulipifera

A process for preparing an extract from the bark of Liriodendron tulipifera comprising the steps of:

• a) mixing 1 weight part of chopped and dried bark of Liriodendron tulipifera with 2 to 20 weights part of ethyl acetate or dichloromethane to form a mixture;
• and
• b) extracting and concentrating said mixture for 1 to 4 days at a temperature of 15° C. to 50° C. to form the extract of the bark of Liriodendron tulipifera,
• wherein said extract comprises 0.1 to 10 weight of epitulipinolide and costunolide, and
• wherein said extraction is made by at least one technique selected from the group consisting of:
• enfleurage, percolation, ultra sonic, maceration and reflux.