Selection of <Emphasis Type="Italic">Saccharomyces cerevisiae</Emphasis> strains for efficient very high gravity bio-ethanol fermentation processes |
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Authors: | Francisco B Pereira Pedro M R Guimarães José A Teixeira Lucília Domingues |
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Institution: | (1) IBB—Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal; |
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Abstract: | An optimized very high gravity (VHG) glucose medium supplemented with low cost nutrient sources was used to evaluate bio-ethanol
production by 11 Saccharomyces cerevisiae strains. The industrial strains PE-2 and CA1185 exhibited the best overall fermentation performance, producing an ethanol
titre of 19.2% (v/v) corresponding to a batch productivity of 2.5 g l−1 h−1, while the best laboratory strain (CEN.PK 113-7D) produced 17.5% (v/v) ethanol with a productivity of 1.7 g l−1 h−1. The results presented here emphasize the biodiversity found within S. cerevisiae species and that naturally adapted strains, such as PE-2 and CA1185, are likely to play a key role in facilitating the transition
from laboratory technological breakthroughs to industrial-scale bio-ethanol fermentations. |
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