Hydrophobic and electrostatic parameters in bacterial adhesion |
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| Authors: | Mark C M van Loosdrecht Willem Norde Johannes Lyklema Alexander J B Zehnder |
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| Institution: | (1) Department of Microbiology, Agricultural University, Hesselink van Suchtelenweg 4, 6703 CT Wageningen, The Netherlands;(2) Department of Physical and Colloid Chemistry, Agricultural University, De Dreyen 6, 6703 BC Wageningen, The Netherlands;(3) Present address: Department of Bioprocessengineering, Delft University of Technology, Julianalaan 67, Delft, The Netherlands |
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| Abstract: | Recently it has been shown that the initial stages of bacterial adhesion to a model-surface of sulphated polystyrene can best be described using hydrophobic and electrostatic parameters. In the present study it is tested whether these parameters can generally be applied to predict bacterial adhesion by using (i) glass, as a model for hydrophilic and natural surfaces of silicates and oxides, (ii) polystyrene coated with proteins, as a model for a surface coated with an organic layer, and (iii) river Rhine sediment, as an example of a natural surface. Adhesion to glass was dominated by electrostatic interaction, whereas adhesion to polystyrene coated with various types of proteins depended on the surface characteristics of the bacteria and the type of protein. By relating Van der Waals interactions to hydrophobicity of the interacting species, the adhesion of bacteria to the various surfaces including the river Rhine sediments could be interpreted in terms of the DLVO-theory. It is therefore concluded that the conceptual principles of the DLVO-theory (interplay of Van der Waals and electrostatic interactions) are suitable to describe, at least qualitatively, the initial processes of bacterial adhesion to a wide range of surfaces. |
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| Keywords: | Adhesion DLVO theory adhesion isotherm hydrophobic interactions electrostatic interactions protein coating |
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