Abstract
In this present study, an easy, eco-friendly, and efficient method for the biogenesis of manganese dioxide nanoparticles (MnO2 NPs) using Momordica charantia leaf extract is discussed. The MnO2 NPs were synthesised by reduction of potassium permanganate using Momordica charantia leaf extract as a reducing agent. Fourier-transform infrared spectra exposed the contribution of the biomolecules in the Momordica charantia leaf extract for the formation of MnO2 NPs. The UV–visible spectrum of the biosynthesized MnO2 NPs displayed absorption peaks at 371 nm, which was the absorption maximum of MnO2 NPs. Crystal phase and crystalline size of the biosynthesized MnO2 NPs was characterized by X-ray diffraction analysis. The X-ray diffraction pattern indicated that the average size of MnO2 NPs was about 36.01 nm. The field emission scanning electron microscopy analysis revealed that the biosynthesized MnO2 NPs have irregularly spherical shape with 16 – 63 nm in size. EDAX confirmed the presence of Mn and O in the MnO2 NPs. The antibacterial activities of MnO2 NPs were evaluated against Bacillus amyloliquefaciens, Bacillus subtilis, and Bacillus cereus. The total antioxidant capacity was evaluated by phosphomolybdenum method. The biosynthesized MnO2 NPs have significant antibacterial activity and antioxidant activity.
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