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Fermentation is a crucial anaerobic metabolic process that enables microbes to derive energy from sugar without relying on oxygen or an electron transport chain. This process is fundamental to various biological and industrial applications and is classified based on the metabolic products generated.Role of Pyruvate in FermentationPyruvate and its derivatives serve as key electron acceptors in fermentative pathways. The oxidation of NADH to regenerate NAD+ is essential for the continuation of...
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Oxidation and Reduction of Organic Molecules01:19

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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Most eukaryotic organisms require oxygen to survive and function adequately. Such organisms produce large amounts of energy during aerobic respiration by metabolizing glucose and oxygen into carbon dioxide and water. However, most eukaryotes can generate some energy in the absence of oxygen by anaerobic metabolism.
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Pyruvate is the end product of glycolysis, where glucose is oxidized to pyruvate, simultaneously reducing NAD+ to NADH. Two molecules of ATP are also produced by substrate-level phosphorylation.
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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.
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In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
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Changes in oxidation-reduction potential during milk fermentation by wild lactic acid bacteria.

Stefano Morandi1, Tiziana Silvetti1, Alberto Tamburini2

  • 1Institute of Sciences of Food Production,Italian National Research Council,via Celoria 2,20133 Milan,Italy.

The Journal of Dairy Research
|September 8, 2016
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Summary

Wild lactic acid bacteria strains show diverse reduction activities, impacting cheese making. More recently isolated strains generally exhibit less reducing power, except for Enterococcus faecalis.

Keywords:
E hlactic acid bacteriaredox potentialreducing activity

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Area of Science:

  • Dairy microbiology
  • Food science
  • Biochemistry

Background:

  • Oxidation-reduction potential (Eh) is crucial for lactic acid bacteria (LAB) in cheese production.
  • Understanding LAB reduction activity is vital for dairy research and industry.

Purpose of the Study:

  • To comprehensively study the milk reduction activity of 709 wild LAB strains.
  • To analyze the impact of isolation period (1960-2012) on LAB reduction kinetics.

Main Methods:

  • Kinetics of milk reduction were characterized by minimum redox potential (Eh7), time to reach Eh7 (t min), maximum difference (Δmax), and time of maximum difference (t*).
  • Studied species included Lactococcus lactis, Enterococcus durans, E. faecium, E. faecalis, and Streptococcus thermophilus.

Main Results:

  • Significant diversity in reduction kinetics was observed across species and strains.
  • Enterococcus faecalis and Lactococcus lactis showed the highest reducing activity.
  • Streptococcus thermophilus exhibited the lowest reducing power and highest heterogeneity.
  • More recently isolated strains (post-1960) generally displayed reduced activity, particularly E. durans, E. faecium, and L. lactis, with an opposite trend in E. faecalis.

Conclusions:

  • LAB reduction potential significantly influences milk fermentation and cheese characteristics.
  • Knowledge of LAB redox potential aids in controlling and standardizing cheesemaking processes.
  • Strain and temporal variations in reduction activity offer insights into LAB evolution in dairy environments.