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Journal of Biomaterials Applications
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Physical Chemical Description of Bacterial Adhesion

Mark C.M. Van Loosdrecht

Dept. of Bioprocess Engineering Delft University of Technology P.O. Box 5057, NL-2600 GB Delft

W. Norde

Dept. of Physical and Colloid Chemistry Delft University of Technology P.O. Box 5057, NL-2600 GB Delft

A.J.B. Zehnder

Dept. of Microbiology Agricultural University RO. Box 8038 NL-6700 EK Wageningen

For the description of general bacterial adhesion phenomena two different physicochemical approaches are available. The first one, based on a surface Gibbs energy balance, assumes intimate contact between the interacting surfaces. According to this approach adhesion is solely related to the Gibbs energies of the surfaces involved. The second approach, based on colloid chemical theories (DLVO theory), allows for two types of adhesion: 1. secondary minimum adhesion, which is often weak and reversible, and 2. irreversible primary minimum adhesion. In the first case a thin water film is present between the interacting surfaces. In the DLVO approach adhesion is determined by long range interactions, i.e., Van der Waals and electrostatic interactions. Van der Waals interactions may be related to the hydrophobicity of the cell wall. For the measurement of bacterial hydrophobicity and electrokinetic potential several macroscopic methods are available. Based on a literature review of the influence of both surface characteristics on adhesion, it is concluded that the surface Gibbs energy balance approach is not adequate to describe the majority of adhesion phenomena. On the other hand the DLVO-theory describes the observations fairly well, especially in the case of reversible (secondary minimum) adhesion. The influence of adsorbing (in)organic compounds, extracellular polymers and cell surface appendages on adhesion can also be predicted by a DLVO-type approach.

Key Words: bacterial adhesion • electrostatic interaction • DLVO-theory • hydrophobicity • surface Gibbs energy.

Journal of Biomaterials Applications, Vol. 5, No. 2, 91-106 (1990)
DOI: 10.1177/088532829000500202
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