Characterization of green synthesized silver nanoparticles from <i>Falconeria insignis</i> Royle and its antimicrobial activity

by M. S. Amithalal, Mari Sumayli, E. S. Abhilash, Yehia Hazzazi, Ugur Azizoglu, Sajjad Sajjad, A. El-Shabasy

Falconeria insignis Royle leaf extract was utilized for the first time as a natural reducing and stabilizing agent in a green precipitation method to synthesize silver nanoparticles devoid of hazardous chemicals. A change in hue from light yellow to pale brown showed that AgNPs were formed. This was confirmed by UV-visible spectroscopy, which showed a unique surface plasmon resonance peak at 300, 350 nm. The FTIR investigation found hydroxyl, carbonyl, amide, C, N, and C, O functional groups. This showed that proteins, phenolics, and flavonoids can bio-reduce and cap. XRD confirmed that the silver was nanocrystalline and had a mean crystallite size of 19 nm. The SEM showed predominantly non-spherical and heterogeneous in overall shape. Biogenic AgNPs are different from crude extract and silver nitrate, had much higher antibacterial activity against Staphylococcus aureus. ANOVA verified statistically significant differences between treatments. According to these findings, F. insignis Royle is a viable, sustainable bioresource for the manufacture of green AgNP with possible biomedical antibacterial uses.