Ethyl alcohol, potassium persulfate and Folin–Ciocalteu reagent were obtained from Merck (Darmstadt, Germany). Trolox Malvidin 3,5-diglucoside, cyanidin 3,5-diglucoside, malvidin 3-glucoside,cyanidin 3-glucoside, peonidin 3-glucoside, delphinidin 3-glucoside and pelargonidin 3-glucoside, kaempferol 3-glucoside,myricetin, quercetin, rutin (quercetin 3-rutinoside), isorhamnetin3-glucoside, (+)-catechin, ()-epicatechin, ()-epicatechin gallate,()-epigalocatechin, procyanidins A2, B1 and B2, and trans-resveratrol were purchased from Extrasynthese (Genay, França).