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Yeast modifies the nonlinear behavior of the electrode electrolyte interface under high voltage stimulation
Sharifi Elham1, Saviz Mehrdad2, Darvishi Farshad3,4
1Department of Biomedical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
Scientific Reports
|April 24, 2025
Summary
This study reveals yeast presence alters electrode responses in dielectric spectroscopy, challenging previous assumptions about cell membrane currents. The findings improve distinguishing cellular from interface effects and enable online cell monitoring.
Area of Science:
- Electrochemistry
- Biophysical techniques
- Spectroscopy
Background:
- Non-linear dielectric spectroscopy differentiates yeast membrane currents from interface behavior by comparing solutions with and without yeast.
- Previous methods may be inaccurate as yeast presence alters electrode voltage drop and nonlinear electrode response.
Purpose of the Study:
- To investigate the effect of yeast on electrode surfaces using a nonlinear mathematical model.
- To re-evaluate the source of increased third harmonic in yeast suspensions.
Main Methods:
- Utilized a four-electrode system to record responses from yeast suspensions subjected to a 23 Hz single-frequency voltage.
- Applied the Butler-Volmer model to analyze the electrochemical interface behavior.
Main Results:
- Yeast presence elevates a model parameter related to interfacial ion concentration or mass transfer.
- The increase in the third harmonic may not solely stem from the yeast membrane's proton pump current.
Conclusions:
- The study provides a more accurate method for distinguishing biological cell effects from interface effects in dielectric spectroscopy.
- The developed model can be applied for real-time monitoring of cell growth in various environments.
