Antibacterial Activity of Piper betle Leaf Extract Mediated MnO2 Nanoparticles

The biogenesis of manganese dioxide nanoparticles using Piper betle leaf extract is explained in this work as a simple, environment friendly and effective process. Using Piper betle leaf extract as a reducing agent, potassium permanganate was reduced to synthesize the MnO2 NPs. The contribution of the biomolecules in the Piper betle leaf extract to the production of MnO2 NPs was revealed by Fourier-transform infrared spectra. The biosynthesized MnO2 NPs' UV–visible spectra showed absorption peaks around 271 nm, which is the MnO2 NPs' absorption maxima. According to the scanning electron microscopy study, the 70–80 nm-sized biosynthesized MnO2 NPs exhibit an irregular form. The presence of Mn and O in the MnO2 NPs was verified by EDAX. MnO2 NPs were tested for their antibacterial properties against Bacillus subtilis, Bacillus cereus, and Bacillus amyloliquefaciens. The antibacterial activity of the biosynthesized MnO2 NPs is mild.