Abstract

• This research work concerns with the preparation and characterization of gold nanoparticles (GNP) and chitosan-gold nanoparticles (CS-GNP) composite beads by chemical method. The gold nanoparticles (GNP) were prepared from chloroauric acid in the presence of sodium borohydride as well as sodium tetraborate used as reducing agents. The existence of prepared GNP in colloidal solutions was determined by using laser pointer by Tyndall effect and the synthesized gold nanoparticles (GNP) solutions were also characterized by UV-visible spectroscopy. On the other hand, chitosan beads were produced from different concentrations of chitosan (1 % to 5 % w/v) in acetic acid solution and sodium hydroxide solution (2 % w/v). The chitosan-gold nanoparticles composites were then prepared from gold nanoparticles and chitosan solutions (3%). The physical properties prepared chitosan beads and chitosan- gold nanoparticles composite beads were studied and also characterized by modern techniques such as FT IR, EDXRF, SEM and XRD analytical methods.