Abstract
In the current scenario, environmental friendly methods of synthesizing nanoparticles and their composites have become a desirable trend. Phytochemicals derived from plant extracts are now being employed as a distinctive method for synthesizing nanoparticles due to their ability to serve as both reducing and capping agents. In present study, copper oxide nanoparticles (CuO NPs), zinc oxide nanoparticles (ZnO NPs) and their mixed composites (CuO/ZnO) were synthesized using the flower extract of plant Cassia alata. The synthesis of nanoparticles was confirmed by observing the colour change of the reaction mixture and was determined by detecting the surface plasmon resonance band at 280, 320 and 359 nm for CuO, ZnO and CuO/ZnO, respectively. The antioxidant activity of nanoparticles was characterized for DPPH, ABTS, NO and iron reducing power method. In addition, the antibacterial properties of these bioactive nanoparticles were also investigated. The CuO/ZnO nanocomposites showed superior antioxidant and antibacterial activity than CuO and ZnO nanoparticles.
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