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Bacteria counting with impedance spectroscopy in a micro probe station
Mats Jönsson1, Ken Welch, Sven Hamp
1Department of Engineering Sciences, The Angström Laboratory, Uppsala University, Sweden.
The Journal of Physical Chemistry. B
|May 19, 2006
Summary
A new method quantifies viable bacteria using impedance spectroscopy. Killing bacteria releases ions, allowing for accurate cell density measurements in suspensions.
Area of Science:
- Biotechnology
- Microbiology
- Biosensing
Background:
- Quantifying viable biological cells is crucial in various fields.
- Existing methods may have limitations in speed or accuracy.
- Understanding cell lysis mechanisms can offer new quantification strategies.
Purpose of the Study:
- To present a novel method for quantifying viable biological cell density.
- To utilize low-frequency impedance spectroscopy for cell quantification.
- To establish a relationship between cell death and ion release.
Main Methods:
- Employing low-frequency impedance spectroscopy to measure changes in ionic concentration.
- Applying a heat shock to kill viable Escherichia coli cells.
- Using a micro probe station with coplanar Ti electrodes for impedance measurements.
Main Results:
- A direct correlation was found between bacterial cell death and the release of immobilized ions.
- Approximately 2 x 10^8 unit charges were released per killed viable bacterium.
- The developed micro probe station is compatible with microfabrication and flow-cell systems.
Conclusions:
- The presented impedance spectroscopy method effectively quantifies viable bacteria.
- The method leverages the release of ions upon cell lysis for accurate measurement.
- The technology is suitable for miniaturized, on-line monitoring systems for bacteria counting.