Shin EM  Kim JY  Park SE  Kim CJ

Vol. 27,  No. 4, pp. 306-314, Dec.  2021
10.7464/ksct.2021.27.3.306

Grape skin antioxidant Anti-wrinkle effect Whitening effect Functional cosmetics

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Grape skins are a natural resource rich in antioxidants, but people only eat grape flesh and have discarded the skins. This study investigated the possibility of using grape skin extract as a raw material for functional cosmetics. The dried grape skin powder was put in distilled water and stirred for 1 h, and then the supernatant separated from the solid was used as an extract. The extract yield was 17.8 ~ 31.4%, and the total flavonoid and polyphenol contents in the extract were 1.8 ~ 2.5 mg-QE g-extract-1 and 16.9 ~ 20.3 mg-GAE g-extract-1, respectively. The extract effectively removed radicals of DPPH and ABTS, and the degree of scavenging increased with the concentration of the extract. The extract inhibited the collagen hydrolysis activity of collagenase, and the activity inhibition rate increased to 84.2% as the extract concentration increased. However, notable inhibition of tyrosinase by the extract was not found. As the extract of Chamaecyparis obtusa was added to the grape-skin extract, the tyrosinase inhibition rate increased, but the DPPH radical scavenging activity decreased. This study found that grape skin extract has a high antioxidant capacity and anti-wrinkle effect but a low whitening effect. However, by mixing the grape skin extract with the extract of C. obtusa in an optimal ratio, the whitening effect was improved with excellent antioxidant and anti-wrinkle effects.