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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
10:15

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Published on: July 22, 2015

Bacteria-polymeric membrane interactions: atomic force microscopy and XDLVO predictions.

Justice M Thwala1, Minghua Li, Mavis C Y Wong

  • 1University of Swaziland , Private Bag 4, Kwaluseni M201, Swaziland, Southern Africa.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 25, 2013
PubMed
Summary
This summary is machine-generated.

Atomic force microscopy directly measured bacterial adhesion forces on membranes. Polydopamine bioprobes revealed differences attributed to bacterial type and surface properties, highlighting limitations of current theories.

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Area of Science:

  • Biophysics
  • Surface Science
  • Microbiology

Background:

  • Bacterial adhesion to surfaces is crucial in many applications.
  • Understanding these forces informs strategies for controlling biofilm formation and material fouling.
  • Existing theories like DLVO often require refinement to fully explain complex interactions.

Purpose of the Study:

  • To directly measure adhesive forces between bacteria and polymeric membranes using atomic force microscopy (AFM).
  • To compare experimental adhesion data with predictions from the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory.
  • To elucidate the roles of surface properties and bacterial characteristics in adhesion.

Main Methods:

  • Utilized AFM with a novel polydopamine-coated bioprobe functionalized with specific bacterial strains (Pseudomonas putida, Bacillus subtilis).
  • Measured interaction forces between immobilized bacteria and various polymeric membrane surfaces.
  • Compared experimental force measurements with theoretical predictions from the XDLVO theory, including steric interactions.

Main Results:

  • Direct measurement of bacterial adhesion forces on different membrane surfaces was achieved.
  • Experimental results showed discrepancies with XDLVO theory predictions, suggesting the need for additional factors like bridging effects.
  • Differences in adhesion between P. putida and B. subtilis were observed and attributed to acid-base and steric interactions.

Conclusions:

  • Bacterial adhesion is influenced by a combination of factors including hydrophilicity, interfacial surface potential, and specific bacterial surface chemistry.
  • The study highlights the limitations of the XDLVO theory alone and the importance of considering additional interaction mechanisms.
  • AFM with bioprobes offers a powerful tool for investigating bacterial-surface interactions at the nanoscale.