Submicrometer-Sized Roughness Suppresses Bacteria Adhesion

ACS Applied Materials & Interfaces
Noemí EncinasDoris Vollmer

Abstract

Biofilm formation is most commonly combatted with antibiotics or biocides. However, proven toxicity and increasing resistance of bacteria increase the need for alternative strategies to prevent adhesion of bacteria to surfaces. Chemical modification of the surfaces by tethering of functional polymer brushes or films provides a route toward antifouling coatings. Furthermore, nanorough or superhydrophobic surfaces can delay biofilm formation. Here we show that submicrometer-sized roughness can outweigh surface chemistry by testing the adhesion of E. coli to surfaces of different topography and wettability over long exposure times (>7 days). Gram-negative and positive bacterial strains are tested for comparison. We show that an irregular three-dimensional layer of silicone nanofilaments suppresses bacterial adhesion, both in the presence and absence of an air cushion. We hypothesize that a 3D topography can delay biofilm formation (i) if bacteria do not fit into the pores of the coating or (ii) if bending of the bacteria is required to adhere. Thus, such a 3D topography offers an underestimated possibility to design antibacterial surfaces that do not require biocides or antibiotics.

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Citations

Aug 19, 2020·Nature Reviews. Microbiology·Denver P LinklaterElena P Ivanova
Jan 10, 2021·Advances in Colloid and Interface Science·Milos KrsmanovicAndrew K Dickerson
Jan 7, 2021·Nanomaterials·Shuhao LiuMustafa Akbulut
Apr 4, 2021·International Journal of Molecular Sciences·Xun Hui WuYoon Yee Then
Jun 6, 2021·Trends in Microbiology·Nuno F AzevedoDarla M Goeres

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Methods Mentioned

BETA
Confocal
confocal microscopy
scanning electron microscopy
electron microscopy

Software Mentioned

Fiji
AnalyzeParticles Plugin
ImageJ
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