Biological synthesis and characterization of copper oxide nanoparticles using aqueous Psidium guajava leave extract and study of antibacterial activity of the copper oxide nanoparticles on Escherichia coli and Staphylococcus aureus

Nanobiotechnogy has been developed to synthesized copper oxide nanoparticle. This was carried out biologically using leaf extract of Psidium guajava as a reducing and stabilizing agent. Optical property showed color change from dark brown gold- yellow after the addition extract. The possible functional group in plant responsible for reduction CuONps identified belonging alkyl halide by FT-IR analysis. UV- visible spectra nanoparticle surface plasmon resonance peak at 390nm. nanoparticles were tested antibacterial activity against two human pathogens viz, Escherichia coli Staphylococcus aureus. Biosynthesized clear zone inhibition or better