Document Detail

Examination of nanoparticle inactivation of Campylobacter jejuni biofilms using infrared and Raman spectroscopies.
MedLine Citation:
PMID:  22734855     Owner:  NLM     Status:  MEDLINE    
AIMS: To investigate inactivation effect and mechanism of zinc oxide nanoparticles (ZnO NPs) activity against Campylobacter jejuni biofilms.
METHODS AND RESULTS: ZnO NPs with concentrations of 0, 0·6, 1·2 and 6 mmol l(-1) were employed in antimicrobial tests against Camp. jejuni planktonic cells and biofilms. Campylobacter jejuni sessile cells in biofilms were more resistant to a low concentration of ZnO NPs when compared to planktonic cells. The ZnO NPs penetrated the extracellular polymeric substance (EPS) without damage to the EPS and directly interacted with the sessile bacterial cells, as determined using infrared spectroscopy and scanning electron microscopy. Raman spectroscopy shows alterations in quinone structures and damage to nucleic acids following Camp. jejuni treatment with ZnO NPs. The mechanism of DNA damage is most likely due to the generation of reactive oxygen species (ROS). Spectroscopic-based partial least squares regression (PLSR) models could predict the number of surviving sessile cell numbers within a bacterial biofilm (≥log 4 CFU, root mean square error of estimation <0·36) from Fourier transform infrared (FT-IR) spectral measurements.
CONCLUSIONS: ZnO NPs were found to have antimicrobial activity against Camp. jejuni biofilms. ZnO NPs penetrated the biofilm EPS within 1 h without damaging it and interacted directly with sessile cells in biofilms. Alterations in the DNA/RNA bases, which are owing to the generation of ROS, appear to result in Camp. jejuni cell death.
SIGNIFICANCE AND IMPACT OF THE STUDY: ZnO NPs may offer a realistic strategy to eliminate Camp. jejuni biofilms in the environment.
X Lu; A T Weakley; D E Aston; B A Rasco; S Wang; M E Konkel
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2012-07-25
Journal Detail:
Title:  Journal of applied microbiology     Volume:  113     ISSN:  1365-2672     ISO Abbreviation:  J. Appl. Microbiol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-09-12     Completed Date:  2013-06-17     Revised Date:  2014-05-01    
Medline Journal Info:
Nlm Unique ID:  9706280     Medline TA:  J Appl Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  952-63     Citation Subset:  IM    
Copyright Information:
No claim to US Government works Journal of Applied Microbiology © 2012 The Society for Applied Microbiology.
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MeSH Terms
Biofilms / drug effects*,  growth & development
Campylobacter jejuni / drug effects*,  growth & development
DNA Damage
DNA, Bacterial / drug effects
Microbial Viability
Microscopy, Electron, Scanning
Quinones / chemistry
Spectroscopy, Fourier Transform Infrared
Spectrum Analysis, Raman
Zinc Oxide / pharmacology*
Grant Support
Reg. No./Substance:
0/DNA, Bacterial; 0/Quinones; SOI2LOH54Z/Zinc Oxide

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