Single-walled carbon nanotubes are not bactericide for Staphylococcus aureus

János Fent and Susan Lakatos

Department of Pathophysiology, Laboratory Institute for Health Protection, Medical Centre of Hungarian Defense Forces

H-1134, Róbert Károly krt. 44, Budapest, Hungary

Nanoparticles are considered as potential antimicrobial agents. In our study Staphylococcus aureus was incubated with either pristine or carboxylated or amidated or pegylated single-walled carbon nanotubes or with carbon black in physiological saline. After these treatments S.aureus retained its growing ability in culture medium, showing that none of tested carbon nanoparticles have detrimental bactericide effect. In addition, amidated and pegylated single-walled carbon nanotubes promote the growth of S.aureus exceeding that of the control. Formation of heterocomplexes proving interactions between bacteria and carbon nanoparticles was demonstrated by light microscopy as well as by flow cytometry.

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