Antibacterial and Antioxidant Activity, Total Phenolics and Flavonoid Contents of brown Seaweeds from Southeast Coast of India

Seaweeds are marine macroalgae which are renewable living resources used as food, feed and fertilizer in many parts of the world. Seaweeds are also considered to be a rich source of antioxidants. The present study is aimed to investigate the antibacterial, antioxidant property, total phenolics and flavonoids of aqueous extract of (i) Spathoglossum asperum (ii) Turbinaria conoides which were obtained from the Southeast Coast of India. DPPH radical scavenging activity and Folin-Ciocalteu reagent were used to determine total antioxidant activity and total phenols of seaweed extracts. Antimicrobial activity was determined by using disc diffusion assay. The aqueous extract of T. conoides showed maximum DPPH radical scavenging activity (50.00%) at 30 min compared to S. asperum (32.78%) at 25 min. The antibacterial activity of aqueous extract of S. asperum and T.conides ranged between 9 - 13mm at 30 µl. The results provided evidence that the studied seaweeds might be a potential source as natural antioxidant and antimicrobial agents.