Tetraphenylborate-sensitive electrode for measuring membrane potential

Area of Science:

• Electrochemistry
• Biophysics
• Analytical Chemistry

Background:

• Ion-selective electrodes (ISEs) are crucial for electrochemical analysis.
• Accurate measurement of membrane potential is vital for understanding cellular processes.

Purpose of the Study:

• To construct and characterize a novel ion-selective electrode for tetraphenylborate (TPB-).
• To evaluate the electrode's performance in biological applications, specifically measuring membrane potential.

Main Methods:

• Fabrication of a new ion-selective electrode sensitive to TPB-.
• Electrochemical characterization using Nernstian response analysis.
• Application in inside-out membrane vesicles from Paracoccus denitrificans to measure membrane potential.

Main Results:

• The developed electrode exhibits Nernstian behavior for TPB- down to 0.1 microM.
• Successfully measured membrane potential in Paracoccus denitrificans vesicles.
• Obtained membrane potential values of 175 +/- 12 mV (NADH) and 180 +/- 6 mV (succinate).

Conclusions:

• The novel TPB- ion-selective electrode is a reliable tool for electrochemical sensing.
• The electrode is applicable for determining membrane potential in biological systems.
• Provides valuable insights into bioenergetics and cellular function.