Green Synthesis of Dense Rock MgO Nanoparticles Using Carica Papaya Leaf Extract and its Shape Dependent Antimicrobial Activity: Joint Experimental and DFT Investigation

The present work reports the green synthesis of MgO nanoparticles (G-MgO NPs) using Carica papaya leaf extract, and a shape dependent density functional investigation for MgO NPs on their antimicrobial activity, for the first time. The synthesized G-MgO nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and Energy dispersive X-ray analysis (EDS). These methods confirmed the presence of the synthesized G-MgO nanoparticles in the range of 20-100 nm with the shape of dense rock. The larger particles of G-MgO NPs resulted from the agglomeration of smaller nanoparticles. The G-MgO NPs are observed to show reasonable antimicrobial activity against the microorganism Bacillus subtilis. A detailed theoretical study under density functional theory (DFT) shows that our synthesized dense rock shaped MgO nanoparticles are better candidate for biological interactions in comparison to the convensional spherical counterpart. The results show that the green synthesis of magnesium oxide nanoparticles using Carica papaya leaf extract can be an alternative to chemical and physical methods with possible biomedicinal applications in addition. [GRAPHICS] .

Automated summary

The study presents the green synthesis of MgO nanoparticles using Carica papaya leaf extract and investigates the shape-dependent antimicrobial activity. The dense rock-shaped G-MgO NPs show reasonable antimicrobial activity against Bacillus subtilis, indicating their potential for biomedical applications.