KENAF EXTRACT AND NOVEL KAEMPFEROL COMPOUND ISOLATED THEM, AND ITS USE

摘要

An extract of Hibiscus cannabinus L.(Malvaceae) and a novel kaempferol compound isolated therefrom are provided to inhibit growth of microorganisms, oxidation and aging in the skin without side effects, so that they are useful in medicines, cosmetics and functional food for improving skin beauty. An extract of Hibiscus cannabinus L. having improved antimicrobial and antioxidizing effects is prepared by extracting Hibiscus cannabinus L. with a solvent selected from water, aliphatic alcohol or alcohol solution, hexane, chloroform and ethylacetate. A novel kaempferol compound represented by the formula(1) is isolated from the extract of Hibiscus cannabinus L. by extracting Hibiscus cannabinus L. with methanol, extracting the crude methanol extract with water, aliphatic alcohol, alcohol solution, hexane, chloroform or ethylacetate to obtain a water layer and an organic layer, and subjecting the water layer and organic layer to silica chromatography, gel filtration chromatography and HPLC(high performance liquid chromatography), sequentially.