Bacteria capture and inactivation with multi-walled carbon nanotubes (MWCNTs) was investigated in this study. Raw MWCNTs (r-MWCNTs) was oxidized in mixed acid, yielding functionalized MWCNTs (f-MWCNTs) with carboxyl and hydroxyl group. UV-Vis absorption spectra and transmission electron
microscope (TEM) shown that surface modifications led to elevated dispersity and stability of f-MWCNTs. The antimicrobial activities of f-MWCNTs to bacterial pathogen Vibrio parahaemolyticus were further explored. Both the colony forming count method and OD growth assay demonstrated
that individually dispersed f-MWCNTs showed a higher antibacterial activity compared to r-MWCNT aggregates, suggesting that dispersity of MWCNTs play an important role to antibacterial effect of CNTs. In addition, viability of bacterial cells treated with f-MWCNTs was found to be incubation
time-dependent, however no correlation between incubation shaking speed and antibacterial activity of f-MWCNTs was observed. SEM and TEM prove that f-MWCNTs mostly wound around surfaces of V. parahaemolyticus cells instead of piecing into the bacterial cells. This is a convincing proof
of physical sorption other than physical punctures, contributing to the possible antimicrobial mechanism of f-MWCNTs to bacterial cells.
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Document Type: Research Article
Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
School of Food Science & Engineering, South China University of Technology, Guangzhou 510640, Guangdong, PR China
April 1, 2020
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