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Influence of Brettanomyces custersianus upon the activity of Saccharomyces cerevisiae strains during the tumultuous phase of vinification BABT
Silva,Gildo Almeida da; Poletto,Carolina Madalozzo; Poli,Jandora Severo; Valente,Patricia.
The aim of this work was to evaluate the influence of Brettanomyces custersianus on the metabolic activity of Saccharomyces cerevisiae during the tumultuous stage of wine production. The Cabernet Sauvignon grape must with the skin was inoculated with individual cultures of Sacch. cerevisiae and with mixed cultures of Sacch. cerevisiae and Br. custersianus. During the 6-day tumultuous phase of fermentation, the highest ethanol production and the highest sugar consumption were obtained with the strains without B. custersianus. Fermentations carried out with the addition of Brettanomyces metabolites, acetic acid and 4-ethylphenol, showed that only the former inhibited the growth of both Sacch. cerevisiae strains used. In some cases, Br. custersianus could...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dekkera/Brettanomyces; Wine; Vinification; Custer effect.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000200017
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Production of functional killer protein in batch cultures upon a shift from aerobic to anaerobic conditions BABT
Silva,Gildo Almeida da; Poli,Jandora Severo; Poletto,Carolina Madalozzo; Schaker,Patricia Dayane Carvalho; Valente,Patricia.
The aim of this work was to study the production of functional protein in yeast culture. The cells of Saccharomyces cerevisiae Embrapa 1B (K+R+) killed a strain of Saccharomyces cerevisiae Embrapa 26B (K-R-)in grape must and YEPD media. The lethal effect of toxin-containing supernatant and the effect of aeration upon functional killer production and the correlation between the products of anaerobic metabolism and the functional toxin formation were evaluated. The results showed that at low sugar concentration, the toxin of the killer strain of Sacch. cerevisiae was only produced under anaerobic conditions . The system of killer protein production showed to be regulated by Pasteur and Crabtree effects. As soon as the ethanol was formed, the functional...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Killer yeast; Crabtree effect; Pasteur effect; Inhibition; Mycocinogenic strain.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000300022
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