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  • Title: Antibacterial activity of Ag-Au alloy NPs and chemical sensor property of Au NPs synthesized by dextran.
    Author: Bankura K, Maity D, Mollick MM, Mondal D, Bhowmick B, Roy I, Midya T, Sarkar J, Rana D, Acharya K, Chattopadhyay D.
    Journal: Carbohydr Polym; 2014 Jul 17; 107():151-7. PubMed ID: 24702930.
    Abstract:
    Gold and silver-gold alloy nanoparticles with mean diameter of 10nm and narrow size distribution were prepared by reduction of the correspondent metal precursors using aqueous dextran solution which acts as both a reducing and capping agent. The formation of nanoparticles was characterized by UV-vis spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD) and dynamic light scattering (DLS). The silver and gold nanoparticles exhibited absorption maxima at 425 and 551 nm respectively; while for the bimetallic Ag-Au alloy appeared 520 nm in between them. TEM images showed monodispersed particles in the range of 8-10nm. The crystallinity of the nanoparticles was assured by XRD analysis. DLS data gave particle size distribution. The dextran stabilized Au nanoparticles used as a colorimetric sensor for detection and estimation of pesticide present in water. The dextran stabilized Ag-Au alloy nanoparticles exhibited interesting antimicrobial activity against bacteria at micromolar concentrations.
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