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Updated: Jun 25, 2026
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Surface Potential Measurement of Bacteria Using Kelvin Probe Force Microscopy
Published on: November 28, 2014
Variation in bacterial ATP level and proton motive force due to adhesion to a solid surface
1Department of Civil and Environmental Engineering, Lehigh University, 13 East Packer Avenue, Bethlehem, Pennsylvania 18015, USA.
Applied and Environmental Microbiology
|February 17, 2009
Summary
Bacterial adhesion to glass surfaces enhances metabolic activity, increasing ATP levels two to fivefold. This occurs due to charge regulation effects altering cell surface pH and boosting proton motive force.
Area of Science:
- Microbiology
- Biophysics
- Biochemistry
Background:
- Bacterial adhesion influences metabolic activity, impacting colonization.
- Understanding adhesion's effect on bacterial metabolism is crucial for various applications.
Purpose of the Study:
- To investigate the impact of surface adhesion on bacterial metabolic activity.
- To elucidate the mechanism behind observed changes in metabolic activity upon adhesion.
Main Methods:
- Assessing bacterial metabolic activity via Adenosine Triphosphate (ATP) measurements.
- Studying adhesion of Escherichia coli and Bacillus brevis to glass surfaces.
- Developing a hypothesis linking cellular bioenergetics and charge regulation effects.
Main Results:
- Bacterial adhesion to glass surfaces significantly enhanced metabolic activity, with ATP levels increasing 2-5 times.
- A proposed mechanism involves charge regulation effects altering cell surface pH and enhancing proton motive force.
- Calculations confirmed that minor pH changes (0.2-0.5 units) suffice for observed ATP increases.
Conclusions:
- Surface adhesion can enhance bacterial metabolic activity, particularly on negatively charged surfaces.
- The charge regulation effect plays a key role in modulating bacterial bioenergetics during adhesion.
- This finding has implications for understanding bacterial colonization and developing surface-based antimicrobial strategies.
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