Reports from National Center for Scientific Research (CNRS) Provide New Insights into Saccharomyces cerevisiae (Interactions between Kluyveromyces marxianus and Saccharomyces cerevisiae in tequila must type medium fermentation)
By a News Reporter-Staff News Editor at Biotech Week -- Investigators publish new report on Saccharomyces cerevisiae. According to news reporting from Toulouse, France, by NewsRx journalists, research stated, "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."
The news correspondents obtained a quote from the research from National Center for Scientific Research (CNRS), "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."
According to the news reporters, the research concluded: "Thus the interaction phenomena between the two yeasts are different in direct and indirect contact, Kluyveromyces being always much more affected than Saccharomyces."
For more information on this research see: Interactions between Kluyveromyces marxianus and Saccharomyces cerevisiae in tequila must type medium fermentation. World Journal of Microbiology & Biotechnology, 2014;30(8):2223-2229. World Journal of Microbiology & Biotechnology can be contacted at: Springer, 233 Spring St, New York, NY 10013, USA (see also Saccharomyces cerevisiae).
Our news journalists report that additional information may be obtained by contacting C.L.F. Lopez, CNRS, Lab Genie Chim, F-31030 Toulouse, France. Additional authors for this research include S. Beaufort, C. Brandam and P. Taillandier.
Keywords for this news article include: France, Europe, Toulouse, Life Sciences, Saccharomycetales, Saccharomycetaceae, Saccharomyces cerevisiae
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