304PRELIMINARY PHYTOCHEMICAL SCREENING AND IN VITRO ANTIOXIDANT POTENTIAL OF SEED EXTRACT OF CASSIA FISTULA LINN.Cassia fistula Linn is used extensively around the world against various ailments. Its metabolite products being most probably responsible for its beneficial effects. This paper reviews the Investigation of primary and secondary metabolite composition and antioxidant activities of 50% methanolic extract of seeds of Cassia fistula which makes this plant remarkable for researchers. Antioxidant properties of hydromethanolic extracts of seeds of Cassia fistula. Reactive oxygen species (ROS) such as superoxide anions, hydrogen peroxide, hydroxyl, and nitric oxide radicals play an important role in oxidative stress. Antioxidant potential of Cassia fistula extracts significantly correlated with the phenolic content of the hydromethanolic extracts and was determined by the hydrogen peroxide scavenging assay kushwahamaya21@gmail.comResearch4102013Cassia fistula,Hydromethanolic,Reactive oxygen species (ROS),Metabolite,AntioxidantMaya Kushwaha,Ramesh Chandra AgrawalDepartment of Research, Priyamvada Birla Cancer Research Institute, JD Birla Road, Satna, Madhya Pradesh, India.,Department of Research, Priyamvada Birla Cancer Research Institute, JD Birla Road, Satna, Madhya Pradesh, India.