Biogenesis of MnO2 nanoparticles using Momordica charantia leaf extract

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 [1]. The UV–visible spectrum of the biosynthesized MnO₂ NPs displayed absorption peaks at 371 nm, which was the absorption maximum of MnO₂ NPs [2, 3]. Crystal phase and crystalline size of the biosynthesized MnO₂ NPs was characterised by X-ray diffraction analysis [4]. 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 – 63nm 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.