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

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Cellulosic ethanol: interactions between cultivar and enzyme loading in wheat straw processing.

Jane Lindedam¹, Sander Bruun, Henning Jørgensen

¹Plant and Soil Science Laboratory, Department of Agriculture and Ecology, Faculty of Life Sciences, University of Copenhagen, Denmark. lindedam@life.ku.dk.

Biotechnology for Biofuels

|November 20, 2010

Summary

Wheat cultivar genetics significantly impact sugar yield for pilot-scale ethanol production. Breeding efforts can optimize sugar conversion efficiency, particularly at lower enzyme loadings, by considering particle size and composition.

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Published on: September 15, 2015

Area of Science:

Biomass Conversion
Agricultural Science
Biotechnology

Background:

Variations in feedstock genotypic qualities largely undescribed for pilot-scale ethanol processing.
Understanding sugar yield differences among wheat cultivars is crucial for optimizing biofuel production.
Hydrothermal pretreatment effects on feedstock characteristics require further investigation.

Purpose of the Study:

Compare glucose and xylose yield from five winter wheat cultivars at varying enzyme loadings.
Evaluate sugar conversion and total sugar yield under pilot-scale conditions.
Analyze particle size distribution of cultivars post-hydrothermal pretreatment.

Main Methods:

Pilot-scale hydrothermal pretreatment of winter wheat straw.
Enzymatic hydrolysis at three enzyme loadings (2.5, 5, and 10 FPU g-1 dm).
Analysis of glucose and xylose yields, and particle size distribution.

Main Results:

Significant interactions between enzyme loading and wheat cultivars observed for sugar yield.
A 17% difference in sugar yield between highest and lowest yielding cultivars at 5 FPU g-1 dm enzyme loading.
Finer particles yielded 11% to 21% more sugar than coarse particles; coarse particles negatively correlated with sugar conversion in low-yield cultivars.

Conclusions:

Genetic differences in wheat cultivars influence sugar yield and enzyme response at pilot scale.
Pretreatment-induced variations in hemicellulose removal, ash accumulation, and particle size distribution are key factors.
Breeding for high sugar yield cultivars under modest enzyme loadings is a promising strategy.