The oxidative damage caused by reactive oxygen species (ROS) leads various diseases such as cancer, coronary heart diseases, renal failure, diabetes, ageing etc. There is an increasing interest in natural antioxidants due to the safety and toxicity problems of synthetic antioxidant. In this study, antioxidant potential of hot water extract of green seaweed Ulva faciata was analyzed by 1, 1- diphenyl-2-picrylhydrazyl (DPPH), superoxide radical scavenging, reducing power and metal chelating assay. Hot water extract exhibited the excellent antioxidant activity against DPPH and superoxide radical assay. This study proved that hot water extract of U. faciata is a powerful antioxidant and it can be used for treating various human diseases.
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