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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.
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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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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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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...
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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...
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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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A Redox-Based Superoxide Generation System Using Quinone/Quinone Reductase.

Shailesh Kumar Singh1, Syed Masood Husain1

  • 1Molecular Synthesis and Drug Discovery Unit, Centre of Biomedical Research, Sanjay Gandhi Postgraduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow, 226014, India.

Chembiochem : a European Journal of Chemical Biology
|May 24, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel enzyme-catalyzed system for superoxide generation using redox-cycling quinones. This method overcomes limitations of previous systems, enabling better study of superoxide in biological research.

Keywords:
enzyme catalysisoxygenquinonesradicalsredox chemistry

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Area of Science:

  • Biochemistry
  • Enzymology
  • Biotechnology

Background:

  • Superoxide (O2.-) generation in biological systems involves complex enzymatic pathways.
  • The xanthine/xanthine oxidase system is limited by enzyme expression, substrate solubility, and consumption.

Purpose of the Study:

  • To develop a novel, efficient, and versatile enzyme-catalyzed system for superoxide generation.
  • To overcome the limitations associated with the xanthine/xanthine oxidase system for in vitro studies.

Main Methods:

  • A redox-based system utilizing autoxidation of hydroquinone to quinone, generating superoxide.
  • Enzymatic reduction of quinone back to hydroquinone using NfsB (oxygen-insensitive nitroreductase) and NADPH.
  • NADPH regeneration via a glucose/glucose dehydrogenase system.
  • Identification of optimal quinone substrate (menadione) through fluorescence assays.

Main Results:

  • A novel, recyclable, and water-soluble quinone-based system for superoxide generation was established.
  • The system utilizes heterologously expressed enzymes, including NfsB.
  • Menadione was identified as the optimal substrate for efficient superoxide production.

Conclusions:

  • The new redox-based system provides a viable alternative for studying superoxide biochemistry.
  • This system facilitates research under diverse physiological and pathological conditions.
  • The developed method offers improved substrate solubility and enzyme expression compared to existing systems.