Reference: Ciani M, et al. (2006) Fermentation behaviour and metabolic interactions of multistarter wine yeast fermentations. Int J Food Microbiol 108(2):239-45

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Abstract


Multistarter fermentations of Hanseniaspora uvarum, Torulaspora delbrueckii and Kluyveromyces thermotolerans together with Saccharomyces cerevisiae were studied. In grape musts with a high sugar content, mixed trials showed a fermentation behaviour and analytical profiles of wines comparable to or better than those exhibited by a pure culture of S. cerevisiae. Sequential trials of T. delbrueckii and K. thermotolerans revealed a sluggish fermentation, while those of H. uvarum exhibited an unacceptable increase in ethyl acetate content (175 ml l(-1)). A low fermentation temperature (15 degrees C) of multistarter trials of H. uvarum resulted in a stuck fermentation that was not due to a deficiency of assimilable nitrogenous compounds since lower amounts of these compounds were used. Sequential fermentation carried out by H. uvarum at 15 degrees C confirmed the high production of ethyl acetate. The persistence and level of non-Saccharomyces yeasts during multistarter fermentations under stress conditions (high ethanol content and/or low temperature) can cause stuck fermentations.

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Journal Article
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Ciani M, Beco L, Comitini F
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