| 摘要 |
PURPOSE:A cosmetic for inhibiting the activity of tyrosinase existing in the human skin, suppressing the formation of melanin, absorbing ultraviolet rays, showing improved beautifying and anti-sunburn effect, having improved shelf stability, containing a fatty acid ester of quercetin as an active ingredient. CONSTITUTION:A cosmetic containing a fatty acid ester of quercetin shown by the formula (R is 3-18C alkyl) as an active ingredient. The amount of the compound added is in a range of usually about 0.01-10wt%, preferably about 1- 5wt%. It is properly mixed with various kinds of base cosmetic materials such as various kinds of alcohols, animal and plant fats and oils, pectin, etc., components such as a stabilizer, etc. to give the cosmetic. The fatty acid ester of quercetin, for example, is synthesized by dissolving quercetin in a solvent such as dioxane, etc., followed by adding a fatty acid chloride in the presence of pyridine to it. |
