Comparative catalytic and bacteriostatic properties of silver nanoparticles biosynthesized using three kinds of polysaccharide

Abstract

Silver nanoparticles (Ag NPs) were biosynthesized using konjac glucomannan (KGM), κ-carrageenan (CRG) and inulin as reducing and capping agent through one-spot method. The structure and morphology of Ag NPs were investigated using UV-visible spectroscopy, transmission electron microscopy, Fourier transform infrared and X-ray powder diffraction. The catalysis and antibacterial properties were also evaluated. Results showed that Ag NPs fabrication was influenced by the incubation temperature and polysaccharide category. CRG displayed a stronger reduction of Ag+ than KGM, and the lowest was inulin. A High incubation temperature promoted the reduction of Ag NPs. As for Ag100 NPs, the kapp of Ag NPs based on CRG, inulin, and KGM were 5.80×10-2 s-1, 2.14×10-2 s-1, and 2.16×10-2 s-1 respectively. Bacteriostatic test showed excellent antimicrobial activity of Ag NPs for Escherichia coli and Staphylococcus aureus. Thus, natural polysaccharide could be effective reducing and stabilizing agents for Ag NPs biosynthesis. The excellent antibacterial and catalytic properties may facilitate their use in medical, food, and biological applications.