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Redox Titration: Overview01:21

Redox Titration: Overview

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Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
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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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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
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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: Apr 15, 2026

NiO Nanoflowers for Non-Enzymatic Amperometric Detection of Glucose
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Low-Potential Osmium-Based PVI redox polymer mediators for Diffusion-Controlled electrochemical glucose

Seok-Yeong Chung1, Won-Yong Jeon2, Tae-Won Seo1

  • 1Department of Chemistry, College of Science and Technology, Dankook University, Cheonan 31116, the Republic of Korea.

Methods (San Diego, Calif.)
|April 13, 2026
PubMed
Summary

This study developed a novel osmium-based polymer mediator for sensitive and selective electrochemical glucose detection. The PVI-Os system offers stable, low-potential sensing, ideal for glucose biosensors.

Keywords:
Electrochemical glucose sensingGlucose dehydrogenase (FAD-GDH)Interference-resistant biosensorLow-potential electrochemistryOsmium redox polymer

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Biosensing

Background:

  • Osmium-based redox polymer mediators are promising for low-potential electrochemical biosensing.
  • Limited systematic evaluation of polymer-ligand coordination effects on electrode performance exists.
  • Need for stable and selective glucose detection platforms.

Purpose of the Study:

  • To synthesize and characterize an osmium-based polymer redox mediator, PVI-Os(dma-bpy)2Cl.
  • To evaluate its quantitative electrochemical performance for glucose detection.
  • To investigate polymer-ligand coordination effects on electrochemical sensing.

Main Methods:

  • Synthesis and characterization of PVI-Os(dma-bpy)2Cl using UV-Vis, FTIR, 1H-NMR, and zeta potential.
  • Electrochemical characterization via cyclic voltammetry and multi-potential step (MPS) on carbon screen-printed electrodes.
  • Immobilization of FAD-dependent glucose dehydrogenase (FAD-GDH) and optimization of measurement conditions (pH, enzyme loading).

Main Results:

  • The synthesized polymer exhibited good aqueous dispersibility and strong positive surface charge.
  • Efficient charge transport and diffusion-controlled redox behavior were observed.
  • Optimized conditions yielded high sensitivity (7.4190 µA cm-2 mM-1) and linearity (R2 = 0.99643) for glucose detection from 1-20 mM at 0.3 V.
  • High selectivity against common electroactive interferents was demonstrated.

Conclusions:

  • Ligand-tuned PVI-Os systems enable stable, low-potential, and interference-resistant electrochemical glucose detection.
  • The developed mediator platform is suitable for integration into electrochemical glucose sensors.
  • Potential applications in enzymatic biofuel cells.