Gamma Radiation-Induced Synthesis and Characterization of Decahedron-Like Silver Nanostructure and Their Antimicrobial Application

In the current study, a decahedron-like silver nanostructure (D-AgNs) was successfully created in an aqueous solution in the presence of Polyvinylpyrrolidone (PVP) as a capping agent using the gamma-radiolysis approach without the use of a reducing agent. The synthesized D-AgNs were characterized using various analytical tools such as UV-Vis. spectroscopy, SEM, XRD, HRTEM, EDX and FTIR. UV-Vis. absorption spectra showed considerable surface Plasmon resonance (SPR) bands at 350-600 nm, indicating that colloidal D-AgNs had been successfully synthesized. HRTEM image demonstrates well-dispersed uniformly decahedral shapes that are well separated from each other. The produced nanoparticles were effectively stabilized by PVP through interactions, confirmed by the FTIR anlaysis. The synthesis of D-AgNs using gamma radiation was accomplished, in addition its antimicrobial potential, antibiofilm activity, and the effect of UV rays were assessed. In addition, protein leakage assays and SEM imaging were employed to analyze the antimicrobial reaction's mechanism. A wide variety of bacteria, including S. aureus, P. aeruginosa, and C. albicans, were deactivated by D-AgNs. In the antibiofilm assay, D-AgNs inhibited the biofilm formation of S. aureus (89.58%), E. coli (80.35%), and P. aureginosa (78.45%). After investigating the effect of D-AgNs on the growth curve of S. aureus, we concluded that D-AgNs affect the growth curve of S. aureus, and the curve was reduced to be 0.125. The formation of holes in the S. aureus cell membrane is explained by the fact that the amount of cellular protein released from the bacteria is directly proportional to the concentration of D-AgNs, which was determined to be 259.25 mu g/ml at concentration equal to 1.0 mg/mL.