Inhibition of Microbial Growth by Silver–Starch Nanocomposite Thin Films

Dušan K. Božanić Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia

Vladimir Djoković Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia. [email protected]

Suzana Dimitrijević-Branković Department of Bioengineering and Biotechnology, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia

Radenka Krsmanović Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia

Michael McPherson Mcpherso Academic Consulting, PostNet Suite 194, Private Bag X2230, Mafikeng South 2791, South Africa

P. Sreekumari Nair Department of Chemistry Lash-Miller Chemical Laboratories, University of Toronto, ON, Canada M5S 3H6

Michael K. Georges Department of Chemistry, University of Toronto at Mississauga, Mississauga, ON, Canada L5L 1C6

Thottackad Radhakrishnan Department of Chemistry, University of Toronto at Mississauga, Mississauga, ON, Canada L5L 1C6

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Abstract

A sago starch biopolymer with embedded silver nanoparticles has been studied as a material for the prevention of microbial growth. Approximately 8 nm in size, silver nanoparticles have been synthesized by reduction of the silver salt in aqueous solution in the presence of sago starch using sodium borohydride as a reducing agent. The obtained solutions were cast on glass plates to obtain thin supported silver–starch nanocomposite films. The morphology of the nanocomposites was investigated by scanning and transmission electron microscopy. UV-Vis absorption spectroscopy showed that during the film formation a part of the silver nanoparticles has been trapped in the water present in the sample, which enabled their partial oxidation into active Ag⁺ species. The oxidation of the silver nanoparticles was confirmed by X-ray photoelectron spectroscopy. The antimicrobial activity tests have shown that the nanocomposite material can be successfully employed to prevent the viability and growth of the common pathogens Staphylococcus aureus, Escherichia coli and Candida albicans.

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Inhibition of Microbial Growth by Silver–Starch Nanocomposite Thin Films

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Inhibition of Microbial Growth by Silver–Starch Nanocomposite Thin Films

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