Abstract: Disclosed is a composition including yeast cells and at least one polyphenols having a molecular weight above 620 Da, the polyphenols are adsorbed and retained in the cytoplasm of the yeast cell. The present disclosure also concerns using the composition in cosmetic, dermatological, nutritional and/or pharmaceutical fields, as well as in winemaking to protect the wine against oxidation, therefore preserving the wine quality, color and aromas, and as an alternative to ageing of wine on lees.

Abstract: The present disclosure concerns a method for the prevention of defective ageing white wines, wherein, during the preparation of said wine, yeast previously rich in glutathione is introduced into the must at the beginning of, during or after the alcoholic fermentation step, the yeast is a Saccharomyces cerevisiae strain deposited at Institut Pasteur, on 20 Feb. 2019 under accession number CNCM 1-5404. The present disclosure also concerns glutathione-rich Saccharomyces cerevisiae strain deposited at Institut Pasteur, on 20 Feb. 2019 under accession number CNCM 1-5404 as well as processes using the strain in active or inactivated forms for preserving wine. The present disclosure also concerns a glutathione-rich inactivated dry yeast comprising a first dipeptide having the formula C12H25N3O3 with a molecular weight of 259.3458 g/mole; and a second dipeptide having the formula C12H25N5O3 with a molecular weight of 287.3593 g/mole, as well as processes using the inactivated dry yeast for preserving wine.

Abstract: Disclosed is a composition including yeast cells and at least one polyphenols having a molecular weight above 620 Da, the polyphenols are adsorbed and retained in the cytoplasm of the yeast cell. The present disclosure also concerns using the composition in cosmetic, dermatological, nutritional and/or pharmaceutical fields, as well as in winemaking to protect the wine against oxidation, therefore preserving the wine quality, color and aromas, and as an alternative to ageing of wine on lees.