The present study was aimed to investigate the antioxidant potential of Sargasssum wightii Greville ex J.Agardh, Padina tetrastromatica Hauck (Paeophyceae), Ulva faciata Delile (Chlorophyceae) and Gracillaria edulis (S.G.Gmelin) P.C. Silva (Rhodophyta) using DPPH and ABTS assays Methods: The whole thallus of S. wightii, P. tetrastromatica, U. faciata and G. edulis were shade dried and extracted with methanol. The crude extracts were examined for antioxidant activities by estimating the scavenging activity of both DPPH and ABTS radicals. Results: The antioxidant result of the present study revealed that the order of radical scavenging activity of the test compounds was as follows Padina tetrastromatica > Ulva faciata > Gracillaria edulis > Sargassum wightii Conclusion: The results of the present study showed that, the selected seaweeds S. wightii, P. tetrastromatica, U. faciata and G. edulis may be rich of good antioxidant activities which can be isolated and further screened for different kind of biological activities depending on their therapeutic uses.
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