To evaluate the in-vitro free radical scavenging activity of leaves Daemia extensa Petroleum ether, ethanol, aqueous extracts of Daemia extensa were prepared, with successive extraction in soxhlet apparatus. Each extract was selected to study the free radical scavenging activity by superoxide scavenging assay method. It was found that aqueous extract contained carbohydrates, glycosides amino acids flavonoids, tannins, alkaloids, steroids; ethanolic extract contained glycosides amino acids flavonoids, tannins, alkaloids, steroids. Ethanolic extract of Daemia extensa has showed 70.8±0.69 % inhibition in superoxide scavenging model. Aqueous extract also showed almost similar activity (67.8±0.58 % compared to ethanolic extract), while Petroleum ether extract showed poor inhibition of superoxide scavenging activity. All extracts showed dose and time dependent inhibition of superoxide scavenging activity. Daemia extensa had the highest total phenolic content (42.60 mg TAE (tannic acid equivalent)/ 100 g fresh weight). Total phenolic content had positive correlation with antioxidant capacity. This shows that the plants, especially Daemia extensa, may be potent source of natural antioxidants.
