Abstract
Ethanol bio-production in Brazil has some unique characteristics that inevitably lead to bacterial contamination, which results in the production of organic acids and biofilms and flocculation that impair the fermentation yield by affecting yeast viability and diverting sugars to metabolites other than ethanol. The ethanol-producing units commonly give an acid treatment to the cells after each fermentative cycle to decrease the bacterial number, which is not always effective. An alternative strategy must be employed to avoid bacterial multiplication but must be compatible with economic, health and environmental aspects. This review analyzes the issue of bacterial contamination in sugarcane-based fuel ethanol fermentation, and the potential strategies that may be utilized to control bacterial growth besides acid treatment and antibiotics. We have emphasized the efficiency and suitability of chemical products other than acids and those derived from natural sources in industrial conditions. In addition, we have also presented bacteriocins, bacteriophages, and beneficial bacteria as non-conventional antimicrobial agents to mitigate bacterial contamination in the bioethanol industry.
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The author acknowledges the research supports from Fundação de Amparo a Pesquisa do Estado de São Paulo (research Grant Numbers 2011/17928-0 and 2014/17794-2) and Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (Grant Numbers 301701/2012-1 and 312244/2015-0 to the author).
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Ceccato-Antonini, S.R. Conventional and nonconventional strategies for controlling bacterial contamination in fuel ethanol fermentations. World J Microbiol Biotechnol 34, 80 (2018). https://doi.org/10.1007/s11274-018-2463-2
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DOI: https://doi.org/10.1007/s11274-018-2463-2