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Related Concept Videos

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...
Amperometry: Overview01:10

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Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
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Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...

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Iridium Oxide-reduced Graphene Oxide Nanohybrid Thin Film Modified Screen-printed Electrodes as Disposable Electrochemical Paper Microfluidic pH Sensors
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Pyrene Derivative-Based Electrode for Electrochemical Sensing.

Ana R Santos1, Fátima Bento2, Bruno Faria1

  • 1IPC - Institute for Polymers and Composites, Campus De Azurém, University of Minho, Guimarães, Portugal.

Small Methods
|June 11, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel pyrene derivative (PY) modified electrode for enhanced electrochemical sensing. The PY-based sensor shows promise for simple, low-cost cortisol detection without biological probes.

Keywords:
electrochemical sensingmolecular dynamicspyrene derivativessurface functionalization

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Biomarker Detection

Background:

  • Screen-printed carbon electrodes offer a low-cost sensing platform.
  • Cortisol is a key biomarker with significant diagnostic relevance.
  • Developing sensitive and selective electrochemical sensors is crucial for disease monitoring.

Purpose of the Study:

  • To develop and evaluate a novel pyrene derivative (PY) modified electrode for electrochemical sensing.
  • To demonstrate the sensor's applicability for cortisol detection.
  • To investigate the molecular interactions underlying the sensing mechanism.

Main Methods:

  • Electrode modification with a pyrene derivative.
  • Cortisol detection using differential pulse voltammetry (DPV).
  • Molecular dynamics (MD) simulations for interaction analysis.

Main Results:

  • The PY-modified electrode exhibited enhanced electrochemical sensing performance.
  • Successful detection of cortisol as a model biomarker was achieved.
  • MD simulations provided insights into PY-cortisol interactions.

Conclusions:

  • The PY-based electrode serves as a simple electrochemical sensing platform.
  • The sensor eliminates the need for biological recognition elements or molecular probes.
  • This pyrene derivative holds potential for developing cost-effective and simplified electrochemical detection protocols.