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Bacterial adhesion onto materials with specific surface chemistries under flow conditions

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Abstract

Staphylococcus epidermidis adhesion onto materials with specific chemical functionalities, under flow, was investigated by using surfaces prepared by self-assembly of alkyl silane monolayers on glass. Terminal methyl (CH3) and amino (NH2) groups were formed by chemical vapor deposition of silanes, at elevated temperature. Carboxyl (COOH) terminated groups were prepared by further modification of NH2 groups with succide anhydride and positively charged NH2 groups by adsorption of poly-l-lysine hydrobromide. Hydroxyl (OH) terminated glass was used as control. Surface modification was verified by contact angle measurements, atomic force microscopy and X-ray photoelectron spectroscopy. A parallel plate flow chamber was used to evaluate bacterial adhesion at various shear rates. Adhesion was found to be depended on the monolayer’s terminal functionality. It was higher on the CH3 followed by the positively charged NH2, the non-charged NH2 groups, the COOH and minimal on the OH-terminated glass. The increase in the material surface free energy significantly reduced the adhesion of a hydrophilic bacterial strain, and this is in accordance with the predictions of the thermodynamic theory. However, the increase in the shear rate restricted the predictability of the theory and revealed macromolecular interactions between bacteria and NH2- and COOH-terminated surfaces.

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Acknowledgments

The authors wish to thank Professor I. Spiliopoulou from the Department of Microbiology, School of Medicine, University of Patras, for providing the bacteria and Dr. E. Siokou from the FORTH/ICE-HT, Patras, for the XPS analysis.

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Authors and Affiliations

  1. Laboratory of Biomechanics and Biomedical Engineering, Department of Mechanical Engineering and Aeronautics, University of Patras, Rion, 26504, Patras, Greece

    M. G. Katsikogianni & Y. F. Missirlis

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  1. M. G. Katsikogianni
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  2. Y. F. Missirlis
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Correspondence to Y. F. Missirlis.

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Katsikogianni, M.G., Missirlis, Y.F. Bacterial adhesion onto materials with specific surface chemistries under flow conditions. J Mater Sci: Mater Med 21, 963–968 (2010). https://doi.org/10.1007/s10856-009-3975-y

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  • DOI: https://doi.org/10.1007/s10856-009-3975-y

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