Nutrient-supplemented propagation of Saccharomyces cerevisiae improves its lignocellulose fermentation ability
Journal article, 2020

Propagation conditions have been shown to be of considerable importance for the fermentation ability of Saccharomyces cerevisiae. The limited tolerance of yeast to inhibitors present in lignocellulosic hydrolysates is a major challenge in second-generation bioethanol production. We have investigated the hypothesis that the addition of nutrients during propagation leads to yeast cultures with improved ability to subsequently ferment lignocellulosic materials. This hypothesis was tested with and without short-term adaptation to wheat straw or corn stover hydrolysates during propagation of the yeast. The study was performed using the industrial xylose-fermenting S. cerevisiae strain CR01. Adding a mixture of pyridoxine, thiamine, and biotin to unadapted propagation cultures improved cell growth and ethanol yields during fermentation in wheat straw hydrolysate from 0.04 g g−1 to 0.19 g g−1 and in corn stover hydrolysate from 0.02 g g−1 to 0.08 g g−1. The combination of short–term adaptation and supplementation with the vitamin mixture during propagation led to ethanol yields of 0.43 g g−1 in wheat straw hydrolysate fermentation and 0.41 g g−1 in corn stover hydrolysate fermentation. These ethanol yields were improved compared to ethanol yields from cultures that were solely short-term adapted (0.37 and 0.33 g g−1). Supplementing the propagation medium with nutrients in combination with short-term adaptation was thus demonstrated to be a promising strategy to improve the efficiency of industrial lignocellulosic fermentation.

Corn cob hydrolysate

Trace metals

Nitrogen source

Inhibitor tolerance

Wheat straw hydrolysate

Vitamins

Industrial Saccharomyces cerevisiae strains

Author

Marlous van Dijk

Chalmers, Biology and Biological Engineering, Industrial Biotechnology

Friederike Mierke

Chalmers, Biology and Biological Engineering, Food and Nutrition Science

Yvonne Nygård

Chalmers, Biology and Biological Engineering, Industrial Biotechnology

Lisbeth Olsson

Chalmers, Biology and Biological Engineering, Industrial Biotechnology

AMB Express

2191-0855 (ISSN)

Vol. 10 1 157

Bottlenecks in cellulosic ethanol production: xylose fermentation and cell propagation

Swedish Energy Agency, 2016-01-01 -- 2019-12-31.

Subject Categories

Renewable Bioenergy Research

Biocatalysis and Enzyme Technology

Other Industrial Biotechnology

DOI

10.1186/s13568-020-01070-y

More information

Latest update

11/27/2020