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Redox Reactions01:24

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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Balancing Redox Equations02:58

Balancing Redox Equations

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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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Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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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: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

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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 Reactions01:27

Redox Reactions

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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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Updated: Apr 29, 2026

EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1
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EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1

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Engineering redox balance through cofactor systems.

Xiulai Chen1, Shubo Li1, Liming Liu1

  • 1State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; Laboratory of Food Microbial-Manufacturing Engineering, Jiangnan University, Wuxi 214122, China.

Trends in Biotechnology
|May 6, 2014
PubMed
Summary
This summary is machine-generated.

Maintaining microbial redox balance is crucial for industrial production of enzymes, pharmaceuticals, and chemicals. This review explores manipulating cofactor systems to achieve optimal metabolic flux and stability.

Keywords:
cofactor engineeringcofactor systemsredox balancesynthetic biology

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Area of Science:

  • Microbial biotechnology
  • Metabolic engineering
  • Biochemical engineering

Background:

  • Redox balance is critical for efficient microbial production of valuable compounds.
  • Industrial processes require stable and maximal carbon flux towards target metabolites.
  • Functional cofactor systems are essential for maintaining cellular redox homeostasis.

Purpose of the Study:

  • To review strategies for manipulating microbial cofactor systems.
  • To enhance redox balance for improved industrial bioproduction.
  • To provide insights into engineering microbial metabolic pathways.

Main Methods:

  • Literature review of cofactor system manipulation techniques.
  • Analysis of strategies for achieving redox homeostasis in microbes.
  • Summarization of methods to engineer cofactor self-, substrate-, and synthetic balance.

Main Results:

  • Cofactor systems can be engineered to support dynamic redox homeostasis or stability.
  • Strategies include improving self-balance, regulating substrate balance, and synthetic engineering.
  • Manipulation of cofactor systems directly impacts metabolic flux and production efficiency.

Conclusions:

  • Engineering cofactor systems is a key strategy to optimize microbial redox balance.
  • Improved redox balance leads to enhanced production of enzymes, pharmaceuticals, and chemicals.
  • This review offers a framework for advancing industrial microbial biotechnology through cofactor engineering.