Researchers at the State University of Campinas (UNICAMP) in Brazil, in collaboration with colleagues at Harvard University in the United States, conducted an innovative study of the DNA and population dynamics of Saccharomyces cerevisiae, the yeast used to produce fuel ethanol from sugarcane by plants throughout Brazil, with the aim of finding routes to more stable, consistent and predictable fermentation performance.
and metagenomics . The results were reported in an article published in the journalAlthough S. cerevisiae is predominant, invasion by foreign strains remains common, as fermentation conditions are affected by factors such as sugarcane variety, process design, operating conditions and weather, not to mentionover the course of a fermentation season, making each of the 400 industrial sugar and ethanol plants in Brazil a unique ecosystem.
In the study, scientists at UNICAMP's School of Food Engineering and Harvard's Department of Organismic and Evolutionary Biology tracked yeast population dynamics in two biorefineries during two production seasons . "DNA sequencing is like fingerprinting. We use it to identify the microorganisms in ethanol fermentation," said Andreas Gombert, a professor at FEA-UNICAMP and first author of the article."We found that despite the presence of invasive strains and the non-aseptic nature of fermentation, all bioethanol lineages were clustered on the same branch of the tree. They were all related and belonged to the ethanol fermentation environment.
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