Elahesadaat Hosseini - Department of Food Science, Shahr Qods Branch, Islamic Azad University, Tehran, Iran
Mohammad Rafiei - Department of Chemistry, Institute for Advanced Studies in Basic Sciences(IASBS), Zanjan, Iran
Mahta Mirzaei - Department of Food Science, Shahr Qods Branch, Islamic Azad University, Tehran, Iran

Objective: Due to rich resources of phenolic components such as anthocyanin and flavonoids, grape has grabbed lots of attention. Antioxidants are the frontline of the human immune system against free radicals and they are of high importance for the human health. Methods: In order to determine antioxidant activities, the amount of phenols, anthocyanin and ascorbic acid of 2 grapes varieties ( white seedless and red seedless as two famous verities of Qazvin’s grapes) have been studied with cyclic voltammetry including, DPPH and Folin-Ciocalteo reagent at room and refrigerator temperature, before and after pasteurization process. Results: The results of this study has shown that the two verities of grapes did not have a meaningfuldifference in total antioxidant concentration; and cyclic voltammetry method has been more or less able to define the type of antioxidant according to the results of this study. Moreover, the two types of grapes had a significant difference in concentration of ascorbic acid and anthocyanin so thatconcentration of ascorbic acid in white grape juice in room temperature was 53ppm while at the same situation it was 24ppm in red grape juice

Grape ، Anthocyanin ، Ascorbic acid ، DPPH ، Cyclic voltammetry