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  • 1.
    Johansson, Emma
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Fermentation performance and physiology of two strains of Saccharomyces cerevisiae during growth in high gravity spruce hydrolysate and spent sulphite liquor2014In: BMC Biotechnology, ISSN 1472-6750, E-ISSN 1472-6750, Vol. 14, p. 47-Article in journal (Refereed)
  • 2.
    Johansson, Emma
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Processum.
    Charilaos, Xiros
    Larsson, Christer
    Fermentation performance and physiology of two strains of Saccharomyces cerevisiae during growth in high gravity spruce hydrolysate and spent sulphite liquor2014In: BMC Biotechnology, ISSN 1472-6750, E-ISSN 1472-6750, Vol. 14, article id Art no 47Article in journal (Refereed)
    Abstract [en]

    Background: Lignocellulosic materials are a diverse group of substrates that are generally scarce in nutrients, which compromises the tolerance and fermentation performance of the fermenting organism. The problem is exacerbated by harsh pre-treatment, which introduces sugars and substances inhibitory to yeast metabolism. This study compares the fermentation behaviours of two yeast strains using different types of lignocellulosic substrates; high gravity dilute acid spruce hydrolysate (SH) and spent sulphite liquor (SSL), in the absence and presence of yeast extract. To this end, the fermentation performance, energy status and fermentation capacity of the strains were measured under different growth conditions.Results: Nutrient supplementation with yeast extract increased sugar uptake, cell growth and ethanol production in all tested fermentation conditions, but had little or no effect on the energy status, irrespective of media. Nutrient-supplemented medium enhanced the fermentation capacity of harvested cells, indicating that cell viability and reusability was increased by nutrient addition.Conclusions: Although both substrates belong to the lignocellulosic spruce hydrolysates, their differences offer specific challenges and the overall yields and productivities largely depend on choice of fermenting strain. © 2014 Johansson et al.; licensee BioMed Central Ltd.

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