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

Abstract

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.

In vivo Antioxidant Potential of Biogenic Silver Nanoparticles Synthesized from Psidium guajava L.

“…Recently, the plantmediated synthesis of AgNPs using Coleus aromaticus leaves [30], peanut seedling [31], and Justicia adhatoda L. leaves [32] was reported. Finally, the biological synthesis of AgNPs was supported by many other previous studies [33][34][35][36].…”

Artificial Sweeteners and Sugar Ingredients as Reducing Agent for Green Synthesis of Silver Nanoparticles

“…The synthesis of nanomaterials can be done by several chemical and physical methods including but not limited to microwave assisted, hydrothermal, heat evaporation, chemical reduction, photochemical reduction, electrochemical reduction, and so on. While nanomaterials can be successfully synthesized using these techniques, there are numerous drawbacks including high cost and the application of toxic solvents and external reducing agents, excessive material conversion, sophisticated equipment, and high-energy requirements [5,[7][8][9][10][11][12][13][14][15]. However, green synthesis approaches aim to achieve sustainable development of nanomaterials through the application of natural products such as reducing agents with inherent growth terminating, stabilizing, and capping characteristics [16,17].…”