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.
Highlights
There is increasing interest in the study of the antioxidant actions of plant and marine algal phenolic compounds due to various evidences that have shown that the consumption of these compounds contributes to the protection from a number of ailments
It has been suggested that phenolic compounds and sulphated polysaccharides may contribute directly to the antioxidative action [29]. These results indicate a strong relationship between total phenolic and sulphated polysaccharides contents and radical scavenging activity, suggesting that phenolic compounds and sulphated polysaccharides are responsible for the antioxidative properties of Ulva lactuca and Turbinaria ornata the therapeutic properties of the polyphenols and sulphated polysaccharides fractions from Ulva lactuca and Turbinaria ornata may be possibly attributed to the phenolic compounds and sulphated polysaccharides present
The results of this study show that both the polyphenols and the sulphated polysaccharides fractions from Ulva lactuca and Turbinaria ornata are showing significant antioxidant activity
Summary
There is increasing interest in the study of the antioxidant actions of plant and marine algal phenolic compounds due to various evidences that have shown that the consumption of these compounds contributes to the protection from a number of ailments. Marine algal polyphenols have been shown to have significant potential health benefits; they may protect cell constituents against oxidative damage and limit the risk of various degenerative diseases associated to oxidative stress such as cancer, cardiovascular disease and osteoporosis. An attempt was made to study the antioxidant potential of the polyphenols and sulphated polysaccharides fractions from green marine alga Ulva lactuca and brown marine alga Turbinaria ornata. DPPH, lipid peroxidation, hydroxyl radical and hydrogen peroxide scavenging activities were successfully used for the evaluation on the antioxidant activity of the polyphenols and sulphated polysaccharides fractions from Ulva lactuca and Turbinaria ornata
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