Phenolic contents, organicacids and antioxidant capacities of twenty grape (Vitis vinifera L.) cultivars having different berry colors

Grapes are rich in phytochemicals and have many health benefits. Some phytochemicals properties of grape must and some grape and seed characteristics of twenty selected grapevine ( Vitis vinifera L.) cultivars having black, red or white skin color were investigated in the present study. The organic acids detected in various ranges were tartaric acid, malic acid, citric acid, succinic acid, and fumaric acid. Tartaric acid, malic acid, citric acid, succinic acid, and fumaric acid reached the highest values in the cultivars of Kirmizi sinceri, Beyaz sinceri, Kirmizi sinceri, Duvrevi and Emiri, respectively. Citric acid reached the highest value in red cultivars and fumaric acid reached the highest value in black cultivars. The phenolic compounds detected in various ranges were rutin, protocatechuic acid, ellagic acid, quercetin, gallic acid, chlorogenic acid, p-coumaric acid, ferulic acid, q-coumaric acid, and fluorodizine. For the highest contents of rutin, protocatechuic acid, ellagic acid, quercetin, gallic acid, chlorogenic, p-coumaric acid, ferulic acid, q-coumaric acid, and fluorodizine were detected in the cultivars of Karrod, Gozane, Polati, Karrod, Duvrevi, Cicike nator, Polati, Resealya and Beyaz sinceri, respectively. Ellagic acid was high in black varieties; rutin was high in red varieties; and the highest chlorogenic acid, p coumaric acid, ferulic acid, protocatechuic acid and gallic acid were found in white cultivars. Total antioxidant capacity ranged from 0.64 to 7.53 mg L −1 , and its highest rate was observed in cv. Emiri. Except for q-coumaric acid, all analysis results were significantly diferent [(P