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Related Concept Videos

Fermentation01:29

Fermentation

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.
Fermentation is a type of metabolic process that occurs in the absence of oxygen, where organic molecules such as glucose are broken down to produce energy. During this process, the...
Biofuels01:25

Biofuels

The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
Microbial Fermentation01:23

Microbial Fermentation

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...
Bioremediation00:46

Bioremediation

Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
Microbial Leaching01:27

Microbial Leaching

Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
Production of Organic Acids01:25

Production of Organic Acids

Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...

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Related Experiment Video

Updated: May 26, 2026

Characterizing Mediated Extracellular Electron Transfer in Lactic Acid Bacteria with a Three-Electrode, Two-Chamber Bioelectrochemical System
10:23

Characterizing Mediated Extracellular Electron Transfer in Lactic Acid Bacteria with a Three-Electrode, Two-Chamber Bioelectrochemical System

Published on: August 23, 2024

Electro-extractive fermentation for efficient biohydrogen production.

Mark D Redwood1, Rafael L Orozco, Artur J Majewski

  • 1School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK. m.d.redwood@bham.ac.uk

Bioresource Technology
|January 10, 2012
PubMed
Summary
This summary is machine-generated.

Electrodialysis enhances biohydrogen and organic acid production from Escherichia coli fermentation. This electrochemical technique precisely controls pH, enabling efficient separation for further bioenergy applications.

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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Published on: January 22, 2015

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Last Updated: May 26, 2026

Characterizing Mediated Extracellular Electron Transfer in Lactic Acid Bacteria with a Three-Electrode, Two-Chamber Bioelectrochemical System
10:23

Characterizing Mediated Extracellular Electron Transfer in Lactic Acid Bacteria with a Three-Electrode, Two-Chamber Bioelectrochemical System

Published on: August 23, 2024

Electrochemically and Bioelectrochemically Induced Ammonium Recovery
09:50

Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Published on: January 22, 2015

Area of Science:

  • Biotechnology and Bioengineering
  • Environmental Science
  • Electrochemistry

Background:

  • Escherichia coli fermentation is a key process for producing biohydrogen and organic acids.
  • Controlling fermentation parameters like pH is crucial for optimizing yields and product purity.
  • Existing methods for product separation can be inefficient and costly.

Purpose of the Study:

  • To investigate the application of electrodialysis for enhancing biohydrogen and organic acid production by Escherichia coli.
  • To precisely control pH during anaerobic fermentation using an electrodialysis system.
  • To evaluate the efficiency of organic acid separation and its potential for further biohydrogen production.

Main Methods:

  • Utilized electrodialysis, an electrochemical membrane technique, coupled with anaerobic fermentation of glucose by Escherichia coli.
  • Designed a model electrodialysis medium with a cationic buffer for electrokinetic pH control.
  • Monitored coulombic efficiencies for organic acid recovery over continuous 30-day experiments.
  • Analyzed the composition of organic acids produced, noting a dominance of butyrate.

Main Results:

  • Electrodialysis significantly prolonged and enhanced biohydrogen and purified organic acid production.
  • Precise pH control was achieved electrokinetically, maintaining organic acid recovery efficiencies between 50-70%.
  • Escherichia coli produced hydrogen and a mixture of organic acids, primarily butyrate, after aerobic growth in a minimal medium.
  • Selective separation of organic acids was demonstrated, yielding a nitrogen-free carbon source.

Conclusions:

  • Electrodialysis is a viable technique for improving the efficiency of biohydrogen and organic acid fermentation.
  • The developed electrodialysis system offers precise pH control and efficient product separation.
  • The separated organic acids can serve as a valuable feedstock for subsequent biohydrogen production, contributing to integrated biorefineries.