Total Phenolic Content Correlated With Antioxidant Activity Of Some Grape Pomace Biomass Hydroalcoholic Extracts, White And Red Varieties

The aim of this paper was to evaluate the total phenolic content and comparative antioxidant activity by three methods, photo chemiluminescence FRAP, DPPH of some grape pomace polyphenolic extracts from white and red varieties of Vitif vinifera (L)., obtained by maceration for 12 days, at room temperature in 40%, 70% aqueous ethanol solution or ethanol. The grape pomace was obtained after the secondary winemaking process of five grape varieties Vitis vinifera (L.) for white wines, Sauvignon Blanc, Muscat Ottonel, and red wines, Feteasca Neagra, Cabernet Sauvignon and Mamaia, created at Research Station for Viticulture and Oenology of Murfatlar, Constanta County, Romania. The results emphasize that an increased phenolic content and antioxidant capacity were obtained for the white varieties, Muscat Ottonel and for the red ones, Cabernet Sauvignon. Regarding the extraction efficiency, for all analyzed grape pomace 70% hydroalcoholic extracts present an increased activity. Based on our preliminary results regarding the radical scavenger activity of grape marc hydroalcoholic extracts, we can consider these by product as a promising resource for dermato-cosmetics with anti-aging effect.