The present invention is a mixture of organic acids and isoflavones one selected from catechin, gallic acid or protocol relates to a skin anti-aging cosmetic composition containing , as an active ingredient, surface-treated nano-particles of gold . No gold nanoparticles surface treated with the phytochemicals of the present invention (GI-Au NPs, PI-Au NPs) are , cytotoxic , and have excellent antioxidant activity , in skin cells, enzyme collagenase (MMP-1 and MMP- 8) inhibit the ability to play with good skin and inhibit peroxidase enzyme (SOD) activity was excellent skin cells also have excellent antioxidant , can be used in anti- aging cosmetic composition is useful . ; 展开▼