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Increasing ethanol yield through fiber conversion in corn dry grind process.

Chinmay V Kurambhatti1, Deepak Kumar1, Kent D Rausch1

  • 1Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States.

Bioresource Technology
|October 4, 2018
PubMed
Summary
This summary is machine-generated.

Adding cellulase during corn fiber to ethanol conversion boosts yields by 4.6%. However, excessive enzyme use hinders fermentation due to yeast stress from high ethanol and phenolic compound concentrations.

Keywords:
CellulaseCellulosic ethanolCorn fiberDry grindPhenolic compounds

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Area of Science:

  • Biotechnology
  • Biochemical Engineering
  • Renewable Energy

Background:

  • Corn fiber is an abundant lignocellulosic material.
  • Dry grind processing is a common method for corn-based ethanol production.
  • Improving ethanol yield from corn fiber can enhance process economics.

Purpose of the Study:

  • To investigate the in-situ conversion of corn fiber to ethanol during the dry grind process.
  • To evaluate the effect of cellulase addition on ethanol yield.
  • To identify factors affecting fermentation efficiency.

Main Methods:

  • Simultaneous saccharification and fermentation (SSF) with in-situ cellulase addition.
  • Dry grind process for corn fiber conversion.
  • Varied cellulase loading (30 FPU/g fiber and 120 FPU/g fiber).

Main Results:

  • A 4.6% increase in ethanol yield was observed with 30 FPU/g fiber cellulase addition compared to the conventional process.
  • Excessive cellulase (120 FPU/g fiber) led to incomplete fermentation and reduced ethanol yield.
  • High concentrations of ethanol and phenolic compounds were identified as stressors impacting yeast performance.

Conclusions:

  • In-situ conversion of corn fiber using optimal cellulase loading can improve ethanol yields in dry grind processes.
  • Excessive cellulase can negatively impact fermentation due to yeast stress.
  • Further research is needed to mitigate yeast stress and optimize enzyme usage for enhanced ethanol production.