Abstract

MEHLOMAKULU, N.N. et al. Screening Non-Saccharomyces Yeasts as Low Ethanol Producing Starter Cultures. S. Afr. J. Enol. Vitic. [online]. 2021, vol.42, n.1, pp.56-66. ISSN 2224-7904.  http://dx.doi.org/10.21548/42-1-4335.

Non-Saccharomyces yeasts are known for their low fermentation rate in comparison to Saccharomyces cerevisiae. In this study, non-Saccharomyces yeasts were inoculated into Chenin blanc grape must and fermented under aerobic and anaerobic conditions. Saccharomycodes ludwigii displayed a strain-dependent fermentation rate, which yielded between 5.2% and 9.9% ethanol concentration under both conditions, albeit with residual sugar. Aerobic conditions favoured the production of reduced ethanol which was between 5.8% and 9.7% for non-Saccharomyces yeasts in comparison to S. cerevisiae (10%). This trend was observed for Wickerhamomyces anomalus, Stamerella bacillaris (Candida zemplinina), Metshnikowia pulcherrima, Cyberlindnera saturnus, Wickerhamomyces subpelliculosus and Cyberlindnera jadinii. The laboratory-scale wines prepared with the aforementioned yeasts yielded ripe fruit and floral aroma attributes while other non-Saccharomyces yeasts resulted in wines with spicy, acidic and solvent aroma notes.

Keywords : Ethanol; non-Saccharomyces; Wine; Aerobic; Anaerobic.

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