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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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Updated: Jul 9, 2025

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A Novel Polymeric Membrane Sensor for Chlorhexidine Determination.

Joanna Lenik1, Karolina Sokal1

  • 1Department of Analytical Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, Maria Curie-Sklodowska Square 3, 20-031 Lublin, Poland.

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|December 9, 2023
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Summary

This study developed a novel potentiometric sensor for accurate chlorhexidine (CHXD) detection. The sensor utilizes a polymer membrane with a specific cyclodextrin derivative, offering a sensitive and rapid method for CHXD analysis in pharmaceutical samples.

Keywords:
chlorhexidine determinationheptakis (2,3,6-tri-O-benzoyl)-β-cyclodextrinion-selective electrodepotentiometrysolid contact

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Area of Science:

  • Electroanalytical Chemistry
  • Sensing Technology
  • Pharmaceutical Analysis

Background:

  • Accurate determination of chlorhexidine (CHXD) is crucial for pharmaceutical quality control.
  • Existing methods for CHXD quantification may lack sensitivity or speed.
  • Development of novel potentiometric sensors offers a promising alternative for rapid analysis.

Purpose of the Study:

  • To develop and optimize a potentiometric sensor for the determination of chlorhexidine (CHXD).
  • To investigate the performance of polymer membranes incorporating cyclodextrins and ion exchangers.
  • To validate the sensor's efficacy in analyzing pharmaceutical formulations containing CHXD.

Main Methods:

  • Fabrication of polymer membrane electrodes plasticized with DOS or o-NPOE.
  • Incorporation of active compounds like cyclodextrins, crown ethers, and ion exchangers.
  • Optimization of electrode composition, focusing on heptakis(2,3,6-tri-O-benzoyl)-β-cyclodextrin and KTpClBP.

Main Results:

  • The optimized sensor exhibited a cationic slope of 30.9 ± 2.9 mV decade⁻¹ within a linear range of 1 × 10⁻⁶ to 1 × 10⁻³ mol L⁻¹.
  • The sensor demonstrated a fast response time (5s for increasing concentration, 10s for dilution) and stable potential over a pH range of 4.0-9.5.
  • Successful application in pharmaceutical samples with high accuracy (RSD = 0.3-1.1%) and low relative error (1.1%).

Conclusions:

  • A highly sensitive and selective potentiometric sensor for CHXD determination was successfully developed.
  • The sensor based on a specific cyclodextrin derivative offers excellent performance characteristics.
  • The developed sensor is suitable for the reliable quantification of chlorhexidine digluconate in pharmaceutical products.