Selection of Saccharomyces cerevisiae strains for efficient very high gravity bio-ethanol fermentation processes

摘要

An optimized very high gravity (VHG)glucose medium supplemented with low cost nutrientsources was used to evaluate bio-ethanol productionby 11 Saccharomyces cerevisiae strains. The industrialstrains PE-2 and CA1185 exhibited the bestoverall fermentation performance, producing an ethanoltitre of 19.2% (v/v) corresponding to a batchproductivity of 2.5 g l-1 h-1, while the best laboratorystrain (CEN.PK 113-7D) produced 17.5% (v/v)ethanol with a productivity of 1.7 g l-1 h-1. Theresults presented here emphasize the biodiversityfound within S. cerevisiae species and that naturallyadapted strains, such as PE-2 and CA1185, are likelyto play a key role in facilitating the transition fromlaboratory technological breakthroughs to industrialscalebio-ethanol fermentations.