| 摘要 |
PURPOSE:To obtain essence containing useful components such as terpene, flavone glycoside or biflavone, from which salicylic acid derivative harmful in contact with the skin is selectively removed, by extracting dried leaves of ginkgo with water containing ethanol in a specific concentration. CONSTITUTION:Dried leaves of ginkgo are extracted with water containing 30-45% ethanol or water containing >=45% ethanol, the extracted solution is made into an aqueous solution containing 30-45% ethanol, from which impurities are removed to give essence of ginkgo. The essence of ginkgo does not contain salicylic acid derivatives harmful in contact with the skin but contains a biflavone such as effective bilobetin having inhibiting action on carcinogenesis and flavone glycosides effective disorder of blood flow. Therefore, the essence of ginkgo can be used as an agent for the skin and for a food. |
