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The aim of the present work was to verify in winemaking the anti-stress efficacy due to the integration of the grape must with two protectants: pomegranate albedo and pomegranate arils; these substances had displayed in vitro anti-stress effects. The effect of pomegranate supplementation on stress tolerance of five strains of  Saccharomyces cerevisiae , one wild type and four descendants, against fermentation in grape must with high sugar content (30°brix) and high acidity (pH 3.00) was studied. So, micro-winemaking trials were carried out using grape must, as it is or supplemented at 2% with pomegranate albedo or with pomegranate arils, inoculated in duplicate with the yeast strains. At the end of winemaking, ethanol and acetic acid content, colour intensity, total phenolic content, and total antioxidant activity by DPPH and ABTS assays were analysed. The results shown the possibility to use pomegranate as protective agent in winemaking with high sugar content and high acidity giving wines in which the fermentable sugars will be fermented with acceptable acetic acid content, very high colour intensity values, very high total phenolic content, and very high antioxidant activity, expressed as DPPH and ABTS values.

Effect of pomegranate supplementation on the wine yeast response to acidic and osmotic stresses