Evaluation of Brazilian ethanol production yeasts for maltose fermentation in media containing structurally complex nitrogen sources |
| |
| Authors: | M. Miranda Junior J. E. de Oliveira M. Batistote J. R. Ernandes |
| |
| Affiliation: | 1. UNESP, Universidade Estadual Paulista, Departamento de Bioquímica e Tecnologia Química, , 14801‐970 Araraquara, SP, Brazil;2. UNESP, Universidade Estadual Paulista, Departamento de Química Organica, Centro de Monitoramento e Pesquisa da Qualidade de Combustíveis, Petróleo e Derivados, Instituto de Química, , 14801‐970 Araraquara, SP, Brazil;3. Universidade Estadual do Mato Grosso Sul, Cidade Universitária de Dourados, , 79804‐970 Dourados, MS, Brazil |
| |
| Abstract: | Maltose and glucose fermentations are strongly affected by the structural complexity of the nitrogen source and by the presence of oxygen. In this study five industrial Saccharomyces cerevisiae strains were grown in synthetic medium, containing maltose or glucose, supplemented with different nitrogen sources, with or without agitation. All strains were able to grow and efficiently ferment glucose, but not all strains were able to grow and ferment maltose well. Peptone and ammonium sulfate induced improved fermentation for all strains and conditions. Under agitation, as expected, higher biomass accumulation was detected. Casamino acids supplementation induced efficient maltose fermentation for all of the strains under aerated conditions, but differing maltose utilization patterns were observed for the static cultures. Copyright © 2012 The Institute of Brewing & Distilling |
| |
| Keywords: | amino acids ethanol production yeasts maltose fermentation nitrogen metabolism oxygen peptides Saccharomyces trehalose yeast |
|
|
