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Antibacterial activity and mechanism of Ag/ZnO nanocomposite against anaerobic oral pathogen Streptococcus mutans.
Journal of Materials Science. Materials in Medicine 2017 January
Dental caries is a widespread disease mainly caused by the anaerobic oral pathogen Streptococcus mutans (S. mutans). Ag/ZnO nanocomposite is an efficient antibacterial agent because of its high antibacterial activity and low cytotoxicity. In this study, rod-like Ag/ZnO nanocomposite was synthesized through a deposition-precipitation method and characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The activity of Ag/ZnO nanocomposite against S. mutans was evaluated by determining the minimal inhibitory concentration, minimum bactericidal concentration and growth inhibition curve. The results showed that Ag/ZnO nanocomposite displayed higher activity against S. mutans compared with pure ZnO nanorods. Moreover, the antibacterial mechanism was investigated by determining the bacterial membrane potential, release of K(+), intracellular reactive oxygen generation and lipid peroxidation. Disruption of membrane function and oxidation of biomacromolecules played important role in the antibacterial action of Ag/ZnO nanocomposite. This work proposes a potentially effective dental antibacterial agent against the dental caries-causing S. mutans.
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