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Bacterial cell surface damage due to centrifugal compaction.
Brandon W Peterson1, Prashant K Sharma, Henny C van der Mei
1Department of Biomedical Engineering, W. J. Kolff Institute, University Medical Center Groningen and University of Groningen, Groningen, The Netherlands.
Applied and Environmental Microbiology
|November 1, 2011
Summary
Centrifugal damage to bacteria can be quantified using a new centrifugation coefficient (C). This coefficient predicts cell surface damage more accurately than centrifugation speed alone, improving experimental reproducibility.
Area of Science:
- Microbiology
- Biophysics
Background:
- Centrifugal force can alter bacterial cell surface properties and internal structures.
- Quantifying bacterial damage from centrifugation is challenging due to complex relationships between speed, container geometry, and cellular changes.
Purpose of the Study:
- To develop a versatile method for analyzing bacterial compaction during centrifugation.
- To establish a centrifugation coefficient (C) that relates to bacterial cell surface properties and damage.
Main Methods:
- A centrifugation coefficient (C) was proposed to describe bacterial compaction.
- The impact of container geometry and centrifugation speeds on C was evaluated.
- Bacterial deposition rates and zeta potential were measured for Staphylococcus aureus under varying C values.
Main Results:
- The centrifugation coefficient (C) significantly changed with container geometry and speed.
- Increasing C correlated with decreased deposition rates and altered zeta potential distributions.
- A critical centrifugation coefficient (0.040) was identified, above which cell surface damage occurred.
Conclusions:
- The centrifugation coefficient (C) is a more reliable predictor of bacterial cell surface damage than centrifugation speed.
- Controlling C improves the consistency of surface-sensitive experimental outcomes.
- This method enhances the predictability and reproducibility of experiments involving bacterial centrifugation.
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