Abstract
ABSTRACTSelected seaweeds (Acanthophora spicifera, Gracilaria edulis, Padina gymnospora, Ulva fasciata, and Enteromorpha flexuosa) from the Gulf of Mannar coast, India, were analyzed for their antioxidant properties. Derived phenols in the methanolic extracts of these seaweeds were quantified and their scavenging activity against 1,1-diphenyl-2-picrylhydrazyl (DPPH) and nitric oxide were examined. Total phenol content was the highest in U. fasciata (23 mg TAE.g–1) and the lowest in A. spicifera (8.8 mg TAE.g–1). Caffeic acid ranged from 0.02 to 1.30 mg.100 g–1 and gallic acid ranged from 0.02 to 1.2 mg.100 g–1. Other derived phenols, coumeric acid, apigenin, chlorogenic acid, 3,4-dihydroxy benzoic acid, and qucercetin, were found in all species. U. fasciata showed the highest efficiency (11 µg.mL–1) against DPPH activity, while E. flexuosa (42 µg.mL–1) had the lowest low activity. G. edulis (36.3%) proved more potent in nitric oxide scavenging activity than any other species, and the lowest activity was noted in E. flexuosa (12.2%). There was a positive correlation between chlorogenic and gallic acids and radical scavenging activity.
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