Abstract
The polyphenols and total antioxidant activities of four wine grapes (Cabernet Sauvignon, Cabenet Franc, Merlot, Cabernet Gernischt) and four table grapes (Muscat, Red Globe, Vitis labruscana Kyoho, Milk grape) were determined and compared. The concentrations of phenolic, flavonoid, anthocyanins and resveratrol of 8 grape varieties were examined. The antioxidant activity including diphenyl picrylhydrazyl radical (DPPH·) scavenging, azinobis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) and ferric reducing power was evaluated. The results indicated that cabernet gernischt contained the highest total phenolic content, total flavonoid content and total anthocyanin content with 257.0 ± 8.9, 607.7 ± 24.3 and 164.2 ± 6.1 mg/100 g, respectively. Merlot had the highest resveratrol content with 11.7 ± 0.61 μg/100 g of fresh sample. The table grapes have less total phenolic, total flavonoid and total anthocyanin content. Cabernet sauvignon, cabernet gernischt and merlot possessed higher antioxidant capacity. On the contrary, the table grapes have less antioxidant capacity. Phenolic content of these fruits is significantly correlated with antioxidant capacity. These findings revealed that phytochemicals in the selected grapes have potent antioxidant activities. Key words: Grape, phenolic, flavonoid, anthocyanin, antioxidant activity.
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