Abstract
Traditional tequila fermentation is a complex microbial process performed by different indigenous yeast species. Usually, they are classified in two families: Saccharomyces and Non-Saccharomyces species. Using mixed starter cultures of several yeasts genera and species is nowadays considered to be beneficial to enhance the sensorial characteristics of the final products (taste, odor). However, microbial interactions occurring in such fermentations need to be better understood to improve the process. In this work, we focussed on a Saccharomyces cerevisiae/Kluyveromyces marxianus yeast couple. Indirect interactions due to excreted metabolites, thanks to the use of a specific membrane bioreactor, and direct interaction due to cell-to-cell contact have been explored. Comparison of pure and mixed cultures was done in each case. Mixed cultures in direct contact showed that both yeast were affected but Saccharomyces rapidly dominated the cultures whereas Kluyveromyces almost disappeared. In mixed cultures with indirect contact the growth of Kluyveromyces was decreased compared to its pure culture but its concentration could be maintained whereas the growth of Saccharomyces was enhanced. The loss of viability of Kluyveromyces could not be attributed only to ethanol. The sugar consumption and ethanol production in both cases were similar. Thus the interaction phenomena between the two yeasts are different in direct and indirect contact, Kluyveromyces being always much more affected than Saccharomyces.
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Acknowledgments
Authors acknowledge the National Council of Science and Technology (CONACYT) in Mexico for financial support (Scholarship No. 175927), to the CIATEJ, Mexico for providing the strains to the National Polytechnic Institute of Toulouse, France for the materials and technological support.
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Lopez, C.L.F., Beaufort, S., Brandam, C. et al. Interactions between Kluyveromyces marxianus and Saccharomyces cerevisiae in tequila must type medium fermentation. World J Microbiol Biotechnol 30, 2223–2229 (2014). https://doi.org/10.1007/s11274-014-1643-y
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DOI: https://doi.org/10.1007/s11274-014-1643-y