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<p>A diversity of secondary plant metabolite with an antioxidant character are present in the vegetal extracts, such as: tocopherols, carotenoids, phenolic acids, flavonoids, etc. These compounds intervene in the cellular defense mechanisms against the free radicals and oxidative stress, as they possess anticancer and anti mutation effect. The aim of this work was to study the antioxidant capacity and polyphenol content of methanolic extracts obtained from seeds of fruits: Vitis vinifera, Malus domestica and Citrullus lanatus. Grape seeds have a high content of antioxidants and polyphenols compounds, due to this, it is recommended their used in obtaining functional food with benefit on the human body.</p>