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Related Concept Videos

Production of Alcohol01:27

Production of Alcohol

Continuous fermentation is a key strategy in industrial ethanol production, particularly when efficiency, scalability, and high yields are essential. This approach allows for uninterrupted operation and optimized resource utilization. The primary feedstock, corn starch, undergoes enzymatic hydrolysis facilitated by α-amylase and glucoamylase. These enzymes break down the starch into fermentable sugars such as glucose, which are readily assimilated by fermentative microorganisms.Fermentation...
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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...
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Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
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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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Related Experiment Video

Updated: Jun 16, 2026

Techniques for the Evolution of Robust Pentose-fermenting Yeast for Bioconversion of Lignocellulose to Ethanol
14:53

Techniques for the Evolution of Robust Pentose-fermenting Yeast for Bioconversion of Lignocellulose to Ethanol

Published on: October 24, 2016

Hemicelluloses for fuel ethanol: A review.

F M Gírio1, C Fonseca, F Carvalheiro

  • 1Laboratório Nacional de Energia e Geologia, I.P., Unidade de Bioenergia, Estrada do Paço do Lumiar 22, 1649-038, Lisboa, Portugal. francisco.girio@lneg.pt

Bioresource Technology
|February 23, 2010
PubMed
Summary

Hemicelluloses are a major waste in cellulosic ethanol production due to their complex structure and poor fermentability. This review covers their processing from field to fuel, including microbial roles in consolidated bioprocessing.

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Last Updated: Jun 16, 2026

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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
10:42

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Published on: August 10, 2016

Area of Science:

  • Biomass Valorization
  • Biochemical Engineering
  • Renewable Energy

Background:

  • Hemicelluloses constitute the largest polysaccharide fraction often wasted in cellulosic ethanol facilities worldwide.
  • Their complex, heterogeneous polymeric nature and low fermentability by common industrial microbes present significant challenges.
  • Efficient utilization is key to improving the economic viability of lignocellulosic biorefineries.

Purpose of the Study:

  • To provide a comprehensive "from field to fuel" review of hemicellulose utilization in lignocellulosic biorefineries.
  • To examine hemicellulose structures, pre-treatment and hydrolysis methods, and microbial fermentation strategies.
  • To highlight recent advancements, technical barriers, and future perspectives in consolidated bioprocessing.

Main Methods:

  • Literature review of hemicellulose structures in lignocellulose.
  • Analysis of various pre-treatment and hydrolysis techniques, including enzymatic approaches.
  • Evaluation of microbial strain capabilities for efficient hemicellulose conversion.
  • Assessment of process integration for consolidated bioprocessing.

Main Results:

  • Hemicelluloses present diverse structures requiring tailored processing strategies.
  • Effective pre-treatment and hydrolysis are crucial for releasing fermentable sugars.
  • Specific microbial strains show promise for direct conversion of hemicelluloses.
  • Consolidated bioprocessing offers a pathway to integrate multiple steps efficiently.

Conclusions:

  • Overcoming hemicellulose heterogeneity and low fermentability is critical for cellulosic ethanol.
  • Advancements in pre-treatment, hydrolysis, and microbial engineering are essential.
  • Integrated approaches like consolidated bioprocessing hold significant potential for future development.