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七叶树甙(esculin)的制备是用甲醇反复在室温下回流提取欧洲七叶树Aesulus hip-pocastanum的皮层,提取液浓缩至1/2,在5～6℃静置24～48h,真空过滤,残渣用甲醇洗涤、干燥、制粉。精制时可将产物中加入60份体积的甲醇和0.02份(重量)的活性炭,回流30min,冷却,过滤,残渣用甲醇洗涤,合并洗液,加水至含醇量为70％,在50～60℃真空浓缩,除净混合物中的醇,残渣用蒸馏水煮
The esculin was prepared by repeatedly extracting the cortex of Aesulus hippocastanum with methanol at reflux at room temperature. The extract was concentrated to 1/2, allowed to stand at 5 to 6°C for 24 to 48 hours, and vacuum filtered. Wash with methanol, dry, and pulverize. When refining, the product can be added to 60 parts by volume of methanol and 0.02 parts by weight of activated carbon, refluxed for 30 minutes, cooled, filtered, the residue is washed with methanol, and the combined washings are added with water to a content of 70% alcohol, at 50-60. Concentrate in vacuo, remove the alcohol from the mixture, and cook the residue in distilled water.