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IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Addition of glutathione-rich inactivated yeasts to white musts: effects on wine composition and sensory quality

Addition of glutathione-rich inactivated yeasts to white musts: effects on wine composition and sensory quality

Abstract

Glutathione plays a key role in preventing some oxidative processes during winemaking. This molecule limits the must enzymatic oxidation, reacts with caffeic acid and generates a colourless compound that prevents subsequent browning. It also has a protective effect on wine aroma, preventing the oxidation of the volatile compounds with a high sensory impact.

In this work, the effects of the addition of a commercial preparation derived from inactivated yeasts (IDY) on the chemical composition and sensory profile of white wines made from three varieties (Tempranillo Blanco, Garnacha Blanca and Viura) from the D.O.Ca. La Rioja (Spain) were evaluated. The IDY preparation containing glutathione (Glutastar, Lallemand, S.L.) was added at a dose of 30 g/Hl to the racked musts.

The obtained results showed differences depending on the grape variety. In Tempranillo Blanco and Viura, the addition of IDY increased the concentration of glutathione and decreased the concentration of catechins and hydroxycinnamic acids. In Viura, some aromatic compounds (amyl alcohols, isoamyl acetate, hexyl acetate and octanoic acid) increased.Overall, the IDY treatment did not influence the organoleptic characteristics of the wines, with slight variety-related modifications in the aromatic profile.

The addition of IDY could be an interesting alternative to slow down oxidation and preserve the aroma of white wines, but its effects have a variety dependence. In this study, the highest antioxidant efficacy was obtained in the Viura variety.

Acknowledgements: This study was co-financed by the European Regional Development Fund (ERDF), granted to the Autonomous Community of La Rioja, within the ERDF Operational Program (2021-2027).

DOI:

Publication date: October 13, 2023

Issue: ICGWS 2023

Type: Poster

Authors

Juana Martinez 1, Elisa Baroja1, Lucía González-Arenzana

1Instituto de Ciencias de la Vid y del Vino (Gobierno de La Rioja, CSIC, Universidad de La Rioja). Finca La Grajera, Carretera de Burgos, km 6, 26071 Logroño, La Rioja, España)

Contact the author*

Keywords

glutathione, specific inactivating yeasts, white wines, oxidation, aroma   

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

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