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Related Concept Videos

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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Potentiometry: Overview01:06

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Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
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Potentiometric Titration: Overview01:31

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Potentiometric titration is a quantitative analytical technique that determines the concentration of an analyte by measuring the potential difference between the two electrodes in the solution. The endpoint of a potentiometric titration is the point at which there is a significant change in the potential difference. It occurs when the stoichiometric reaction between the analyte and the titrant is complete. The endpoint is usually determined graphically by plotting the measured potential...
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Related Experiment Video

Updated: Oct 6, 2025

Author Spotlight: Oxygen-Independent Assays to Measure Mitochondrial Function in Mammals
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Versatile potentiometric metabolite sensing without dioxygen interference.

Nicole L Walker1, Jeffrey E Dick2

  • 1Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.

Biosensors & Bioelectronics
|January 15, 2022
PubMed
Summary
This summary is machine-generated.

Open circuit potentiometric biosensors offer size-independent signals, overcoming limitations of traditional electrochemical sensors. This study introduces a novel chitosan-based sensor for broad analyte detection in biological systems.

Keywords:
Alcohol dehydrogenaseFAD-Dependent glucose dehydrogenaseOpen circuit potentialPeroxidaseSecond-generation biosensor

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Area of Science:

  • Electrochemistry
  • Biosensor Technology
  • Biotechnology

Background:

  • Electrochemical biosensors, primarily amperometric and voltammetric types, face limitations due to signal dependence on electrode size.
  • Open circuit potentiometric sensors are emerging as a promising alternative, offering signal insensitivity to electrode dimensions.

Purpose of the Study:

  • To develop and validate a second-generation potentiometric biosensor using modified chitosan hydrogels.
  • To demonstrate a rapid screening method for enzyme-mediator pairs for potentiometric sensing.
  • To establish the efficacy and advantages of this novel biosensor design for various analytes.

Main Methods:

  • Modification of chitosan hydrogel with electron mediators to entrap oxidoreductase enzymes.
  • Utilizing open circuit potentiometry to measure changes in interfacial potential upon analyte interaction.
  • Screening enzyme-mediator pairs and testing biosensor performance with specific enzymes (FADGDH, ADH, peroxidase) and analytes (glucose).

Main Results:

  • Demonstrated a swift screening method for enzyme-mediator pairs using open circuit potentiometry.
  • Achieved dynamic ranges of 0.1 to 50 mM glucose using 1,2-naphthoquinone mediator with FADGDH.
  • Showcased ease of fabrication, long sensor lifetime (≥28 days), insensitivity to interferents, and microscale miniaturization.

Conclusions:

  • The developed potentiometric biosensor offers a robust, size-independent platform for analyte detection.
  • This technology provides a foundation for generalized application in biologically-relevant systems, even in the presence of oxygen as an interferent.
  • The sensor's versatility, stability, and ease of modification make it suitable for diverse biosensing applications.