Antioxidant properties of seaweed polyphenol from Turbinaria ornata (Turner) J. Agardh, 1848

To explore the antioxidant activity of seaweed polyphenol from Turbinaria ornate (T. ornate). The brown seaweed, T. ornata was collected from Mandapam coastal region of Gulf of Mannar. It was cleaned from epiphytes, washed, shade dried and powdered. Algal extraction was carried out using methanol. The total phenol content of T. ornata was estimated by Folin-Ciocalteau method and its antioxidant activity was determined by free radical scavenging assays such as DPPH, Superoxide anion, Hydroxyl and Nitric oxide radical assay. T. ornata exhibited (43.72±1.63) mgGAE/g extract of phenol content and better scavenging activity of DPPH [(84.27 ± 2.17)%], Superoxide anion [(61.86 ± 2.03)%], and Hydroxyl radical [(70.12 ± 2.03)%]. The presence of phenolic compounds were detected by TLC and FT-IR analysis, which revealed that the antioxidant activity might be due to the high polyphenol content of T. ornata with respect to their free radical scavenging properties.