| 摘要 |
PROBLEM TO BE SOLVED: To obtain a tyrosinase-activity inhibitor that develops excellent tyrosinase-activity inhibitory action, and is useful as a beautifying cosmetic material by the use of a carboxylic acid of a specific structure which is obtained from royal jelly. SOLUTION: This tyrosinase-activity inhibitor comprises one or more carboxylic acids selected from a group of C8 or C10 carboxylic acids consisting of o-hydroxydecanic acid, decanic acid, 2-decenoic acid, 3-hydroxydecanoic acid, sebasic acid, trans-2-octenic acid, octanoic acid, 3-hydroxyoctanoic acid and suberic acid. These carboxylic acids are preferably royal jelly-derived compounds obtained from royal jelly by extraction. The extract from royal jelly has no skin irritation, and has excellent adaptability to skin. It is preferable to add approximately 1-20wt.% of this tyroxynase-activity inhibitor to a beautifying cosmetic. |
