Abstract
Ethanolic and aqueous extract of Ipomoea batatas (L.) Lam. leaf grown in Croatia were prepared. Antioxidant activity of the extracts, as well as their effect on intracellular glucose-induced oxidative stress, was determined. Antioxidant activity was assayed by DPPH radical scavenging activity, reducing power, activity in β-carotene-linoleic acid assay, and superoxide dismutase-like activity. In addition to being richer in phenols and flavonoids than aqueous extract, ethanolic extract also demonstrated superior antioxidant activity in all the assays. In a concentration of 10 μg/ml, both extracts were able to significantly increase intracellular glutathione levels.
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