GREEN SYNTHESIS OF SILVER NANOPARTICLES BY PAPAYA PEEL EXTRACT

This study was to investigate an efficient, cost effective and sustainable route of silver nanoparticles (AgNP) from silver nitrate. In this natural green synthesis, papaya peel extract which act as natural reducing agent to synthesize silver nanoparticles. The characteristic color is changed to reddish brown in the reaction due to reduction. The AgNPs were characterized by UV-visible (vis) spectrophotometer, FTIR and scanning electron microscopy (SEM) with EDAX. The synthesized silver nanoparticles (AgNPs) were visually confirmed with surface plasmon resonance peak at 440 nm upon UV–Vis spectroscopy analysis. Fourier transform infrared spectroscopy (FT-IR) affirmed the role of fruit extract as a reducing and capping agent of silver ions. Furthermore, the nanoparticles formation were characterized with different pH, temperature and stability of the nanoparticles. AgNPs displayed strong antibacterial potentials against Gram-positive and Gram-negative bacteria. Papaya peel -AgNPs also displayed with strong free radical scavenging and reducing power. Based on strong antibacterial and antioxidant capacities, PP-AgNPs are anticipated to have potential applications in the biomedical industries.