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Related Concept Videos

Microbial Fermentation01:23

Microbial Fermentation

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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...
439

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Study on manipulation of ruminal fermentation using a bioelectrochemical system.

Mariana Aguilar-González1, Germán Buitrón2, Armando Shimada3

  • 1Posgrado en Ciencias de la Producción y la Salud Animal, Universidad Nacional Autónoma de México (UNAM), Ciudad de México, México.

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Summary

Applying a 0.75V electric potential to rumen liquid significantly boosted acetate, propionate, and butyrate production by rumen microorganisms. This electrochemical stimulation altered volatile fatty acid profiles without impacting the core microbiome or grass digestion.

Keywords:
bioelectrochemical cellelectrofermentationmicrobiomerumen fermentationvolatile fatty acids

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Area of Science:

  • Rumen microbiology
  • Bioelectrochemistry
  • Animal nutrition

Background:

  • Rumen microorganisms are crucial for ruminant digestion and nutrient metabolism.
  • Modulating rumen fermentation can improve animal feed efficiency and reduce methane emissions.
  • Bioelectrochemical systems offer a novel approach to influence microbial metabolic activity.

Purpose of the Study:

  • To develop and evaluate a bioelectrochemical cell for modifying rumen microbial metabolism.
  • To assess the impact of applied electric potential on carbohydrate fermentation and volatile fatty acid (VFA) production.
  • To characterize changes in the rumen microbial community structure in response to electrochemical stimulation.

Main Methods:

  • Construction of a two-chamber bioelectrochemical cell.
  • Application of electric potential to ruminal liquid.
  • Analysis of volatile fatty acids (acetate, propionate, butyrate) using gas chromatography.
  • Molecular characterization of the rumen microbial community via DNA sequencing.

Main Results:

  • An electrochemical stimulation of 0.75V significantly enhanced acetate (71%), propionate (86%), and butyrate (63%) production.
  • No significant effect was observed on grass substrate disappearance, indicating targeted metabolic modulation.
  • Volatile fatty acid production profiles were altered, but the core rumen microbiome composition remained largely unchanged.

Conclusions:

  • Bioelectrochemical stimulation is a viable method to enhance VFA production in the rumen.
  • This technology offers a potential strategy for improving ruminant nutrition and reducing enteric fermentation byproducts.
  • Further research is warranted to optimize electrochemical parameters and assess long-term effects on rumen function and animal health.