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Related Experiment Video

Updated: Jul 4, 2026

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

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

Published on: October 24, 2016

Conversion of pentoses by yeasts.

C S Gong¹, T A Claypool, L D McCracken

¹Laboratory of Renewable Resources Engineering, Purdue University, West Lafayette, Indiana 47907, USA.

Biotechnology and Bioengineering

|January 1, 1983

Summary

Yeast strains can metabolize D-xylose, D-xylulose, L-arabinose, and xylitol, producing various compounds like ethanol and polyols. Mutant strains show promise for enhanced ethanol production from D-xylose.

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Area of Science:

Microbiology
Biochemistry
Yeast Metabolism

Background:

Yeasts are crucial microorganisms for industrial bioprocesses.
Understanding pentose utilization by yeasts is key for biofuel and chemical production.

Purpose of the Study:

To investigate the metabolic capabilities of various yeast strains in utilizing D-xylose, D-xylulose, L-arabinose, and xylitol.
To identify preferred substrates and products formed during yeast fermentation.
To explore the potential of induced mutant yeast strains for improved D-xylose conversion.

Main Methods:

Culturing diverse yeast strains.
Analyzing fermentation products including polyols, ethanol, and organic acids.
Inducing and isolating mutant yeast strains with altered metabolic pathways.

Main Results:

Most yeasts utilize D-xylose and D-xylulose, producing xylitol, ethanol, and organic acids, with D-xylulose being the preferred substrate.
Xylitol is a poor carbon source for most yeasts, though some produce ethanol.
L-arabinose is utilized by most strains, yielding L-arabitol.
Mutant strains were successfully generated from Candida sp. and Saccharomyces cerevisiae.

Conclusions:

Yeast strains exhibit differential utilization of pentose sugars and xylitol, with varying product profiles.
D-xylulose and D-xylose are significant substrates for yeast bioconversion.
Mutant yeast strains offer potential for optimizing ethanol production from D-xylose and studying pentose metabolic regulation.