Population and oenological characteristics of non-Saccharomyces yeasts associated with grapes of Northwestern Argentina
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Yeasts population associated with grapes from Northwest Argentina, a region with a significant vine-growing increase over the past years, was evaluated. Ten species of non-Saccharomyces yeasts were identified from four grape varieties (Malbec, Merlot, Syrah and Torrontes) being Hanseniaspora uvarum the dominant species. Typing of isolates revealed genetic variability within Hanseniaspora genus and also high variability was observed according to their oenological characteristics. Based on the oenological properties, the most adequate strains as starter cultures were H. uvarum HuT7, HuMe15, HuS16, H. vineae HvT-mc1 and Metschnikowia pulcherrima MpT2/MpT3. These selected yeasts exhibited moderate resistance to SO2, reduced values of volatile acidity, null or low production of H2S, high levels of enzymes related to aroma and did not produce killer toxins. Further studies using mixed cultures of these non-Saccharomyces strains and S. cerevisiae are needed to validate the contribution of selected indigenous yeasts on wine organoleptic characteristics.
KeywordsNative yeasts Regional wine Oenological characteristics Hanseniaspora uvarum Strain selection
Authors are grateful to Elena Bru for her collaboration with statistical analyses. This work was supported by grants of Agencia Nacional de Promoción Científica y Tecnológica (PICT 2010-0847 and PICT 2013-1930) and Consejo Nacional de Investigaciones Científicas y Técnicas (PIP 0320), Argentina.
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Conflict of interest
The authors declare that they have no conflict of interest.
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