Abstract
Antioxidant activity of edible species of seaweeds consisting of green seaweeds (Chaetomorpha media and Enteromorpha intestinalis), brown seaweeds (Padina tetrastromatica and Dictyota dichotoma) and red seaweeds (Gracilaria corticata and Gelidiella acerosa) was determined using methanol and ethanol as extraction media. FRAP, ferrous ion chelating activity, DPPH assay, reducing power and total antioxidant capacity along with the total phenolic content were determined in ethanol and methanol extracted seaweeds. The methanolic extract of Enteromorpha intestinalis and ethanolic extract of Dictyota dichotoma had an appreciable radical scavenging activity, total antioxidant activity and reducing power than the other seaweeds. There was a significant correlation between the DPPH activity scored from the methanolic seaweed extracts, total antioxidant capacity analyzed from ethanolic extracts and the total phenol content ( R2 = 0.769 and 0.782 resp.).
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