title: The consequences of Lactobacillus vini and Dekkera bruxellensis as contaminants of the sugarcane-based ethanol fermentation.
abstract: This work describes the effects of the presence of the yeast Dekkera bruxellensis and the bacterium Lactobacillus vini on the industrial production of ethanol from sugarcane fermentation. Both contaminants were quantified in industrial samples, and their presence was correlated to a decrease in ethanol concentration and accumulation of sugar. Then, laboratory mixed-cell fermentations were carried out to evaluate the effects of these presumed contaminants on the viability of Saccharomyces cerevisiae and the overall ethanol yield. The results showed that high residual sugar seemed the most significant factor arising from the presence of D. bruxellensis in the industrial process when compared to pure S. cerevisiae cultures. Moreover, when L. vini was added to S. cerevisiae cultures it did not appear to affect the yeast cells by any kind of antagonistic effect under stable fermentations. In addition, when L. vini was added to D. bruxellensis cultures, it showed signs of being able to stimulate the fermentative activity of the yeast cells in a way that led to an increase in the ethanol yield.
authors: Interdepartmental Research Group on Metabolic Engineering, Federal University of Pernambuco, Recife, PE 50670-901, Brazil.
authors: Rafael Barros
authors: RB
authors: de Souza
authors: Billy Manoel
authors: BM
authors: dos Santos
authors: Raquel
authors: R
authors: de Fátima Rodrigues de Souza
authors: Paula Katharina Nogueira
authors: PK
authors: da Silva
authors: Brígida Thais Luckwu
authors: BT
authors: Lucena
authors: Marcos Antonio
authors: MA
authors: de Morais
mesh_terms: D001709:Biotechnology; D050260:Carbohydrate Metabolism; D055167:Dekkera / Q000254:growth & development / Q000302:isolation & purification*; D004340:Drug Contamination; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D007778:Lactobacillus / Q000254:growth & development / Q000302:isolation & purification*; D059027:Recycling; D012441:Saccharomyces cerevisiae / Q000254:growth & development / Q000378:metabolism; D031786:Saccharum / Q000378:metabolism* / Q000382:microbiology
chemical_list: D000431:Ethanol