Abstract
This work reports on preparation, characterization, and antibacterial
activity of graphene oxide (GO) decorated with biogenic silver
nanoparticles (Bio-AgNPs) produced by the fungus Fusarium oxysporum.
This nanocomposite (Bio-GOAg) was prepared by an ex situ process through
the physical mixture of a GO dispersion with the previously prepared
Bio-AgNPs. The adsorption of the Bio-AgNPs onto the GO sheets was
confirmed by transmission electron microscopy. The average size of the
Bio-AgNPs anchored onto the GO surface was found to be 3.5 nm. The
antibacterial activity of the Bio-GOAg nanocomposite against
Gram-positive and Gram-negative microorganisms was investigated and a
very promising result was found for the Gram-negative strains. In
addition, the Bio-GOAg nanocomposite displayed a very strong biocidal
activity against the Salmonella typhimurium strain at a concentration of
2.0 mu g/mL. The antibiofilm activity toward S. typhimurium adhered on
stainless steel surfaces was also investigated. The results showed 100
% inhibition of the adhered cells after exposure to the Bio-GOAg
nanocomposite for 1 h.
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