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Antibacterial activity of Ag-Au alloy NPs and chemical sensor property of Au NPs synthesized by dextran
K BANKURA, D MAITY, M M R MOLLICK, D MONDAL, B BHOWMICK, I ROY, T MIDYA, J SARKAR, ,
Published in Elsevier Ltd
2014
PMID: 24702930
Volume: 107
   
Issue: 1
Pages: 151 - 157
Abstract
Gold and silver-gold alloy nanoparticles with mean diameter of 10 nm 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 8-10 nm. 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. © 2014 Elsevier Ltd.
About the journal
JournalData powered by TypesetCarbohydrate Polymers
PublisherData powered by TypesetElsevier Ltd
ISSN0144-8617
Open AccessNo