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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
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Updated: Jul 17, 2026

Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen
17:16

Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen

Published on: June 3, 2018

Differential ionic permeation of DNA-modified electrodes.

Donato M Ceres1, Andrew K Udit, Haley D Hill

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

The Journal of Physical Chemistry. B
|January 19, 2007
PubMed
Summary

DNA films exhibit selective ion permeability, influencing electrochemical responses. A new AC impedance method using ferricyanide offers sensitive DNA surface coverage analysis, valuable for hybridization studies.

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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
14:53

A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

Published on: September 10, 2014

Area of Science:

  • Electrochemistry
  • Materials Science
  • Biomaterials

Background:

  • DNA films on electrodes are studied for their ionic permselectivity.
  • Methylene blue (MB) electrochemical response is used to probe film properties.
  • Understanding ion interactions within DNA films is crucial for biosensor development.

Purpose of the Study:

  • To investigate the ionic permselectivity of DNA films.
  • To analyze the electrochemical behavior of methylene blue (MB) in different buffer solutions.
  • To develop a novel method for DNA surface coverage analysis.

Main Methods:

  • Electrochemical analysis of methylene blue (MB) on DNA-modified electrodes.
  • Varying pH and ionic strength in p-nitrophenol (p-NP) and phosphate buffers.
  • AC impedance spectroscopy using ferricyanide as an anionic probe.

Main Results:

  • Linear Pourbaix diagram in p-NP buffer indicates a two-electron, one-proton MB reduction.
  • Curved Pourbaix diagram in phosphate buffer suggests anion-dependent MB thermodynamics.
  • DNA films exhibit differential permselectivity based on anion identity, not just ion exclusion.

Conclusions:

  • DNA films display anion-dependent ionic permselectivity.
  • A new AC impedance method using ferricyanide provides sensitive DNA surface coverage analysis.
  • This method is advantageous for studying DNA hybridization and dehybridization, being insensitive to film morphology.