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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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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...
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Related Experiment Video

Updated: Apr 6, 2026

Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules
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Label-free electrochemical DNA sensor using "click"-functionalized PEDOT electrodes.

Teresa Galán1, Beatriz Prieto-Simón2, Margarita Alvira3

  • 1Nanobioengineering group, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 15-21, Barcelona 08028, Spain; Electronics Department, University of Barcelona (UB), Martí i Franquès 1-11, Barcelona 08028, Spain.

Biosensors & Bioelectronics
|July 27, 2015
PubMed
Summary

This study presents a label-free electrochemical DNA sensor using poly(3,4-ethylenedioxythiophene) (PEDOT) for Hepatitis C virus detection. The sensor achieves high selectivity and a low limit of detection without complex fabrication.

Keywords:
Azido-EDOTClick chemistryDNA biosensorDifferential pulse voltammetryElectrochemistryHepatitis C virus

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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
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Area of Science:

  • Electrochemistry
  • Materials Science
  • Molecular Biology

Background:

  • Label-free electrochemical DNA sensors are crucial for rapid disease diagnostics.
  • Conducting polymers like PEDOT offer unique electrochemical properties for biosensing applications.
  • Efficient immobilization of DNA probes onto sensor surfaces is key for reliable detection.

Purpose of the Study:

  • To develop a label-free electrochemical DNA sensor for detecting Hepatitis C virus sequences.
  • To utilize poly(3,4-ethylenedioxythiophene) (PEDOT) modified electrodes for enhanced DNA hybridization detection.
  • To establish a sensitive and selective genosensor platform using click chemistry for probe immobilization.

Main Methods:

  • Immobilization of acetylene-terminated DNA probes onto azido-derivatized PEDOT electrodes via click chemistry.
  • Detection of DNA hybridization using differential pulse voltammetry to monitor changes in PEDOT's electrochemical properties.
  • Characterization of the sensor's performance, including selectivity and limit of detection.

Main Results:

  • A highly selective PEDOT-based genosensor was successfully developed.
  • The sensor demonstrated a limit of detection of 0.13 nM for Hepatitis C virus DNA.
  • The method avoided the need for labeling techniques and complex microelectrode fabrication.
  • Successful detection of DNA hybridization through changes in polymer electrochemical properties.

Conclusions:

  • The developed PEDOT-based electrochemical sensor offers a promising platform for label-free and reagentless DNA hybridization detection.
  • This technology has significant potential for diagnostic applications, including the screening of diseases like Hepatitis C.
  • The facile probe immobilization strategy allows for easy adaptation to detect various DNA sequences and genetic mutations.