Green synthesis and characterization of silver nano-particles from pharmaceutically important Periploca hydaspidis and their biological activity.

The present study describes the synthesis, characterization of nano-particles from Periploca hyaspidis and their in vitro biological activity. The synthesis of AgNPs was confirmed by UV-Vis spectrophotometer and structure by atomic force microscope. The crystallite size and different functional groups was determined by X-ray diffraction and Fourier transformed infrared spectroscopy. Anti-microbial and anti-oxidant activity was carried out by disc diffusion and DPPH radical scavenging protocol respectively. Silver nano-particles (AgNPs) were synthesized by mixing 1mM AgNO3 solutions with plant boiled extract in 1:9. The color change from yellow to dark brown indicated the synthesis of the nano-particles. The AgNPs were more stable at 25°C to 45°C, 1mM concentration of the salt and neutral to slightly basic pH. The results revealed that aromatic amines were responsible for the synthesis of AgNPs. The crystallite size was 7.50 nm, cubic and in nanorgime. AgNPs showed good anti-oxidant activity and was effective against K. pnemoniae, E. coli, X. compestris, C. albicans and P. chrysogenum.