| abstract |
This invention relates to the isolation, and use of a plant extract in the treatment of skin hyper-pigmentation. More particularly, this invention relates to the isolation of a tyrosinase inhibitor in an extract of plant material from the Greyia radlkoferi (G. radlkoferi) plant, the extract including 5,7-dihidroxyflavone[(2S)A-pinocembrin]; 2', 6'-dihydroxy-4'-methoxydihydrochalcone; 2',4',6'-trihydroxyhydrochalcone; 3,5, 7-trihydroxyflavone and 4' ,5'7-thhydroxyisoflavone. |