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Redox Reactions

Redox Reactions

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...

Redox Reactions

Redox Reactions

Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...

Redox Equilibria: Overview

Redox Equilibria: Overview

A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...

Redox Titration: Other Oxidizing and Reducing Agents

Redox Titration: Other Oxidizing and Reducing Agents

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...

Redox Titration: Overview

Redox Titration: Overview

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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Related Experiment Video

Updated: Jul 15, 2026

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Published on: January 8, 2016

Enzyme activity control by responsive redoxpolymers.

Birgit Nagel¹, Axel Warsinke, Martin Katterle

¹Fraunhofer Institute for Biomedical Engineering, Potsdam, Germany. Martin.Katterle@ibm

Langmuir : the ACS Journal of Surfaces and Colloids

|May 3, 2007

Summary

A novel thermoresponsive polymer enhances glucose dehydrogenase detection. This redox polymer film shows inverse temperature behavior, improving electron transfer for sensitive enzyme sensing.

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Published on: November 26, 2014

Area of Science:

Electrochemistry
Polymer Science
Biosensors

Background:

Thermoresponsive polymers offer tunable properties for biosensing.
Redox polymers facilitate electron transfer in electrochemical biosensors.
Soluble glucose dehydrogenase (sGDH) with pyrrolinoquinoline quinone (PQQ) cofactor is a target for enzyme detection.

Purpose of the Study:

To synthesize and characterize a new thermoresponsive poly-N-isopropylacrylamide (PNIPAM)-ferrocene polymer (PNIPAMFoxy).
To develop a self-assembled film of PNIPAMFoxy on a gold electrode for enzyme detection.
To investigate the temperature-dependent behavior of the immobilized redox polymer and its interaction with sGDH.

Main Methods:

Synthesis and characterization of PNIPAMFoxy with oxirane groups.
Self-assembly of PNIPAMFoxy onto a cysteamine-modified gold electrode.
Electrochemical detection of soluble glucose dehydrogenase (sGDH) using the modified electrode.
Investigation of temperature effects on electron transfer efficiency.

Main Results:

A hydrophilic film of PNIPAMFoxy was successfully created on a gold electrode.
Immobilized PNIPAMFoxy exhibited an inverse temperature response compared to its soluble form.
Maximal electron transfer efficiency for PNIPAMFoxy with sGDH occurred at 24°C, doubling that of the soluble polymer.
A detection limit of 0.5 nM for PQQ-sGDH was achieved with a current density of 4.5 µA·cm⁻² at 10 nM sGDH and 5 mM glucose.

Conclusions:

The novel PNIPAMFoxy polymer enables sensitive electrochemical detection of sGDH.
The inverse temperature response of the immobilized polymer enhances biosensor performance.
This redox polymer system offers a promising platform for enzyme-based biosensing applications.