Document Detail

Antibacterial action of dispersed single-walled carbon nanotubes on Escherichia coli and Bacillus subtilis investigated by atomic force microscopy.
MedLine Citation:
PMID:  20877897     Owner:  NLM     Status:  MEDLINE    
Single-walled carbon nanotubes (SWCNTs) exhibit strong antibacterial activities. Direct contact between bacterial cells and SWCNTs may likely induce cell damages. Therefore, the understanding of SWCNT-bacteria interactions is essential in order to develop novel SWCNT-based materials for their potential environmental, imaging, therapeutic, and military applications. In this preliminary study, we utilized atomic force microscopy (AFM) to monitor dynamic changes in cell morphology and mechanical properties of two typical bacterial models (gram-negative Escherichia coli and gram-positive Bacillus subtilis) upon incubation with SWCNTs. The results demonstrated that individually dispersed SWCNTs in solution develop nanotube networks on the cell surface, and then destroy the bacterial envelopes with leakage of the intracellular contents. The cell morphology changes observed on air dried samples are accompanied by an increase in cell surface roughness and a decrease in surface spring constant. To mimic the collision between SWCNTs and cells, a sharp AFM tip of 2 nm was chosen to introduce piercings on the cell surface. No clear physical damages were observed if the applied force was below 10 nN. Further analysis also indicates that a single collision between one nanotube and a bacterial cell is unlikely to introduce direct physical damage. Hence, the antibacterial activity of SWCNTs is the accumulation effect of large amount of nanotubes through interactions between SWCNT networks and bacterial cells.
Shaobin Liu; Andrew Keong Ng; Rong Xu; Jun Wei; Cher Ming Tan; Yanhui Yang; Yuan Chen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-09-29
Journal Detail:
Title:  Nanoscale     Volume:  2     ISSN:  2040-3372     ISO Abbreviation:  Nanoscale     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-12-01     Completed Date:  2011-03-21     Revised Date:  2011-06-22    
Medline Journal Info:
Nlm Unique ID:  101525249     Medline TA:  Nanoscale     Country:  England    
Other Details:
Languages:  eng     Pagination:  2744-50     Citation Subset:  IM    
School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459.
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MeSH Terms
Anti-Bacterial Agents / chemistry,  pharmacology*
Bacillus subtilis / drug effects*
Escherichia coli / drug effects*
Microscopy, Atomic Force
Nanotubes, Carbon / chemistry*
Reg. No./Substance:
0/Anti-Bacterial Agents; 0/Nanotubes, Carbon

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