Synthesis and Charactrization of Au Nanocomposits by Green Capping Agent: Pomegranate juice For Antibacterial Activity

Objective(s): In this work, pomegranate juice was used as a capping agent for self assembly to form particleslike Au nanostructures in the presence of AuHCl4.3H2O as aurate source. Besides, to investigate the concentration effect of pomegranate juice as the green capping agent on the morphology and particle size of final products several experiments were performed. Methods: The assynthesized products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transformation infrared (FT-IR). Au nanostructures exhibited stronger antibacterial properties against Gram-negative bacteria (Salmonella typhi and Escherichia coli) than against Gram-positive bacteria (Staphyloccocus aureus and Staphyloccocus epidermidis). Results: Microwave irradiation provides a rapid and green method for the synthesis of AuNP. It favors the formation of small and uniform nanoparticles through a fast and homogeneous nucleation and crystallization. Both AuNPs nanocomposites showed antibacterial activity that is stronger against Gram-negative bacteria (E. coli and S. typhi) than against Gram-positive bacteria, (S. aureus and S. epidermidis) Conclusions: This rapid method of microwave radiation as compared to the classical  synthesis, showed promising results in terms of size distribution, surface area, pore diameter and pore volume.