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Evaluation of the double contamination of Dekkera bruxellensis and Lactobacillus fermentum on the alcoholic fermentation: study of the interactions among the microorganisms and the factors that affect the fermentation aiming the control of contaminations

Grant number: 12/16258-4
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): October 01, 2012
Effective date (End): August 16, 2015
Field of knowledge:Biological Sciences - Microbiology - Applied Microbiology
Principal Investigator:Sandra Regina Ceccato Antonini
Grantee:Ana Paula Guarnieri Bassi Alvarenga
Host Institution: Centro de Ciências Agrárias (CCA). Universidade Federal de São Carlos (UFSCAR). Araras , SP, Brazil

Abstract

The research applied to the alcoholic fermentation has been concentrated preferably in problems concerned to bacterial contamination, leaving the wild yeasts(yeasts not inoculated into the process) as a poor studied theme. More recently the presence of the genera Dekkera and Brettanomyces has caused troubles in fermentative processes for ethanol production. No study has evaluated the simultaneous contamination of bacteria and Dekkera in industrial conditions for ethanol production in Brazil by now, the factors that affect the development of these contaminations and especially which is the most efficient management aiming their control. This work will verify the effect of factors (subsrate, fermentation system and cell treatment)on the contaminations by yeasts from the species Dekkera bruxellensis (strains CCA059, CCA077 e CCA155) and bacteria belonging to the species Lactobacillus fermentum. The fermentations will be carried out with the selected strain PE-02. The study of interactions among these microorganisms will be also evaluated regarding the production of metabolites by both culturs (organic acidas and bacteriocines) as well as in the competitivity displayed by the cultures in fermentation conditions (low concentration of sugars,utilization of non-assimilable nitrogen sources by S. cerevisiae and presence of sulfite).

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GUARNIERI BASSI, ANA PAULA; MENEGUELLO, LETICIA; PARALUPPI, ANNA LIVIA; PECORARO SANCHES, BEATRIZ CRISTINA; CECCATO-ANTONINI, SANDRA REGINA. Interaction of Saccharomyces cerevisiae-Lactobacillus fermentum-Dekkera bruxellensis and feedstock on fuel ethanol fermentation. ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY, v. 111, n. 9, p. 1661-1672, . (12/16258-4, 11/17928-0)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
ALVARENGA, Ana Paula Guarnieri Bassi. Evaluation of the simultaneous contamination by Dekkera bruxellensis and Lactobacillus fermentum on the alcoholic fermentation: effects of the substrate and forms of control. 2016. Doctoral Thesis - Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) Piracicaba.

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