Quantification of the interaction between biomaterial surfaces and bacteria by 3-D modeling.
It is general knowledge that bacteria/surface interactions depend on the surface topography. However, this well-known dependence has so far not been included in the modeling efforts. We propose a model for calculating interaction energies between spherical bacteria and arbitrarily structured 3-D surfaces, combining the Derjaguin, Landau, Verwey, Overbeek theory and an extended surface element integration method. The influence of roughness on the interaction (for otherwise constant parameters, e.g. surface chemistry, bacterial hydrophobicity) is quantified, demonstrating that common experimental approaches which consider amplitude parameters of the surface topography but which ignore spacing parameters fail to adequately describe the influence of surface roughness on bacterial adhesion. The statistical roughness profile parameters arithmetic average height (representing an amplitude parameter) and peak density (representing a spacing parameter) both exert a distinct influence on the interaction energy. The influence of peak density on the interaction energy increases with decreasing arithmetic average height and contributes significantly to the total interaction energy with an arithmetic average height below 70 nm. With the aid of the proposed model, different sensitivity ranges of the interaction between rough surfaces and bacteria are identified. On the nanoscale, the spacing parameter of the surface dominates the interaction, whereas on the microscale the amplitude parameter adopts the governing role.
Friedrich Schiller University Jena, Institute of Materials Science and Technology, Löbdergraben 32, 07743 Jena, Germany; Friedrich Schiller University Jena, Department of Bioinformatics, Ernst-Abbe-Platz 2, 07743 Jena, Germany.
Daniel
D
Siegismund
Andreas
A
Undisz
Sebastian
S
Germerodt
Stefan
S
Schuster
Markus
M
Rettenmayr
D001419:Bacteria / Q000187:drug effects*; D001422:Bacterial Adhesion / Q000187:drug effects*; D001672:Biocompatible Materials / Q000494:pharmacology*; D005583:Fourier Analysis; D008954:Models, Biological; D013499:Surface Properties; D013816:Thermodynamics
D001672:Biocompatible Materials
Bacterial adhesion; Biomaterial-centered infection; Biomaterials; Computer simulation; Surface topography