In vitro antioxidant activities of selected seaweeds from Southeast coast of India

Objective: In vitro antioxidant activities of three selected Indian seaweeds viz., Halimeda tuna (H. tuna), Turbinaria conoides (T. conoides) and Gracilaria foliifera (G. foliifera) were evaluated. Methods: Total antioxidant activity, total phenolic content, and reducing power of crude methanol and diethyl ether extracts were determined. Results: Total phenolic content and total antioxidant activity were higher (1.231 +/- 0.173 mg GAE/g, 1.675 +/- 0.361 mg GAE/g) in T. conoides respectively. Reducing power of crude methanol extract increased with concentrations of the extract. The Fourier transform-infra red spectrum analysis revealed the presence of polyphenolic signals. The seaweed extracts displayed moderate antioxidant activity compared to gallic acid standard. Conclusions: The seaweeds could be considered for curing diseases from oxidative deteriorations.