Silver Nanoparticles Biosynthesis, Structural Characterization, Antibacterial Action, and Antioxidant Potential

The goal of this work is to address the green synthesis of silver nanoparticles (AgNPs) from Cassia occidentalis leaf aqueous extract. The AgNPs were studied using UV–visible spectroscopy, transmission electron microscopy, scanning electron microscopy, and X-ray diffraction. The spectra of AgNPs had a single strong peak at 435 nm, but the spectra of extract had two peaks at 230 and 250 nm, indicating the presence of polyphenols and phytochemicals in the solution, and the X-ray diffraction patterns showed that they were crystals. Obtained nanoparticles are round and oval in shape, according to TEM and SEM investigations, with diameters ranging from 6 to 30 nm. Pathogenic microorganisms such as E. coli and B. subtilis were used to investigate AgNPs antibacterial efficacy. As a consequence, it was discovered that green AgNPs exhibit significant antibacterial activity.