Facile green synthesis of gold nanoparticles with gum arabic as a stabilizing agent and reducing agent

Abstract

A facile, completely green, and cheap route for the synthesis of Au nanoparticles at 25-75°C has been developed by using only hydrogen tetrachloroaurate as the precursor and gum arabic (GA) simultaneously as a reducing agent and a stabilizing agent. No extra reagents are needed. From the analyses of UV/VIS absorption spectra, TEM, HRTEM, SAED, and XRD patterns, the formation of Au nanoparticles with a fcc structure was recognized. The synthesis reaction was usually finished in 2-4 h. Increasing the reaction temperature increased the formation rate but had no significant effect on the optical property and size of Au nanoparticles. With increasing Au(III) ion concentration or GA concentration, the mean diameter of Au nanoparticles slightly increased. Also, the particle size distribution became broader at higher Au(III) ion concentration or lower GA concentration due to the insufficient protection. Although raising the GA concentration was helpful to reduce Au(III) ions completely and stabilize the Au nanoparticles, too high GA concentration was not suitable for the stabilization of Au nanoparticles because the increased intermolecular force of GA might hinder the dispersion of Au nanoparticles. Furthermore, the resultant Au nanoparticles were found to remain highly stable in the NaCl solution.

A new X-ray contrast agent based on highly stable gum arabic-gold nanoparticles synthesised in deep eutectic solvent

“…However, as the amount of GA increased further (100 mg or above), a decrease in CT value was observed. As it has been reported previously, [37] at high GA concentration, a broad particle size distribution might be resulted which is due to the increased intermolecular force of GA molecules. This fact in turn may hinder the dispersion of GNPs.…”

Synthesis of Gold Nanoparticles Stabilized in Dextran Solution by Gamma Co-60 Ray Irradiation and Preparation of Gold Nanoparticles/Dextran Powder

“…In addition, biopolymers such as chitosan [9][10][11], alginate [12,13], hyaluronan [14,15], gum arabic [16,17], protein [18,19], gelatin [20], dextran [21], and glucomannan [22] have been also used as stabilizers of colloidal AuNPs solution. On the other hand, materials based on functionalized AuNPs are regarded as one of the most important nanocomposites especially due to their biological and catalytic activities [23,24].…”

Green Synthesis: Nanoparticles and Nanofibres Based on Tree Gums for Environmental Applications

“…glutathione), and sugars (e.g. glucose, fructose) are such materials, which provide suitable reducing and surface agents for the nanoparticle synthesis/stabilization [14][15][16][17][22][23][24][25][26][27][28][29][30]. Plant extracts are regarded as one of the most promising natural reducing agents, such as metabolities (e.g.…”