Assessment of In vitro Antioxidant Potential of the Polyphenols and the Sulphated Polysaccharides fractions of Ulva lactuca and Turbinaria ornata

Abstract

Aims: To assess the in vitro antioxidant potential of the polyphenols and the sulphated polysaccharides fractions from green marine alga Ulva lactuca and brown marine alga Turbinaria ornata. Study Design: In the present work, 1,1-diphenyl-2-picryl-hydrazyl (DPPH), lipid peroxidation, hydroxyl radical and hydrogen peroxide scavenging activities were used for the evaluation of the antioxidant potential of the polyphenols and the sulphated polysaccharides fractions from Ulva lactuca and Turbinaria ornata. Place and Duration of Study: Department of Biochemistry, Adhiparasakthi College of Arts and Science (Autonomous), G.B. Nagar, Kalavai – 632 506, Tamil Nadu, India. Methodology: The polyphenols and the sulphated polysaccharides fractions were extracted from green marine alga Ulva lactuca and brown marine alga Turbinaria ornata, and were assayed for in vitro antioxidant potential using the 1,1-diphenyl-2-picryl-hydrazyl (DPPH), lipid peroxidation, hydroxyl raidcal and hydrogen peroxide scavenging activities. Results: Both the polyphenols and the sulphated polysaccharides fractions were extracted from green marine alga Ulva lactuca and brown marine alga Turbinaria ornata, showed good in vitro antioxidant potential with the 1,1-diphenyl-2-picryl-hydrazyl (DPPH), lipid peroxidation, hydroxyl radical and hydrogen peroxide scavenging activities. The percentage of inhibition ranged from 90.37 – 100.0 % inhibition for polyphenols fraction and 68.73 – 95.23 % for sulphated polysaccharides. The IC50 values ranged from 0.185 mg/ml to 0.430 mg/ml. Conclusion: Both the polyphenols and the sulphated polysaccharides fractions from Ulva lactuca and Turbinaria ornata are shown to be capable of scavenging a wide range of synthetic and naturally occurring free radicals, and they could be utilized as good natural source of antioxidants. These data may contribute to a rational basis for the use of antioxidant-rich marine algal fractions in the therapy of diseases related to oxidative stress.