Green synthesis and characterizations of silver and gold nanoparticles using pink guava waste extract (PGWE)

Metal nanostructures have unusual physicochemical properties and biological activities compared to their bulk parent materials. Thus in recent years a number of physical, chemical and biological techniques were applied for the development of metal nanoparticles (NP). In this paper we have reported the green synthesis of silver (AgNPs) and gold (AuNPs) nanoparticles by reduction of silver nitrate and chloroauric acid solutions, respectively, using fruit extract of pink guava waste. Surface plasmon resonance spectra for silver and gold are obtained at 451 and 578 nm with brown yellow and pink-red color, respectively. Silver and gold nanoparticles vary in size according to different temperature and aging time used for the synthesis. The instrumental techniques were applied to characterize the synthesized silver and gold nanoparticles is UV-vis.