 IVES 9 IVES Conference Series 9 Macrowine 9 Macrowine 2021 9 Grapevine diversity and viticultural practices for sustainable grape growing 9 Evaluation of glutathione content in four white varieties in the d.o. Ca. Rioja (Spain)

Evaluation of glutathione content in four white varieties in the d.o. Ca. Rioja (Spain)

Abstract

AIM: Glutathione is a tripeptide that is mainly found in reduced form in grapes. It generates during the maturation of the grape, increasing significantly after veraison [1]. It plays a relevant role in the prevention of oxidative processes due to its high antioxidant activity. Its content in the grape is influenced by many factors (variety, vintage, cultural practices, nitrogen nutrition …) [2]. In musts and wines, it undergoes modifications due to oxygen exposure, tyrosinase activity, maceration time, pressing, yeast strain…[3]. The aim of this work was to evaluate the content of glutathione in the grape of four white varieties: Tempranillo Blanco, Maturana Blanca, Garnacha Blanca and Viura.

METHODS: The study was carried out during three seasons (2017, 2018 and 2019) in a vineyard located in the D.O.Ca. Rioja (Spain). On the other hand, the influence of different vineyard locations on the content of this compound in the indicated varieties was also analyzed. Glutathione determination was carried out by HPLC by automatic derivatization in precolumn with OPA. The previous extraction in the grape was carried out with HCl/EDTA [4].

RESULTS: The results obtained showed important varietal differences in the glutathione content of the grape in the white varieties studied. The highest concentration was obtained in the Tempranillo Blanco variety, although without significant differences in comparison to Viura, while the lowest levels corresponded to Maturana Blanca and Garnacha Blanca. Also, the characteristics of the vintage also influenced its concentration, although the varietal differences were maintained. The location of the vineyard showed a variable effect depending on the vinifera, and the characteristics of the vintage in the case of Tempranillo Blanco.

CONCLUSIONS

These results confirm that the variety is one of the most influential factors in the glutathione content in grapes. Tempranillo Blanco has high levels of this compound, which can help preserve the quality of your wines.

DOI:

Publication date: September 2, 2021

Issue: Macrowine 2021

Type: Article

Authors

Juana Martinez

Instituto De Ciencias De La Vid Y Del Vino (Gobierno De La Rioja, Csic, Universidad De La Rioja),Laura, Alti, Instituto De Ciencias De La Vid Y Del Vino (Gobierno De La Rioja, Csic, Universidad De La Rioja) Sara, Garcia, Instituto De Ciencias De La Vid Y Del Vino (Gobierno De La Rioja, Csic, Universidad De La Rioja) Elisa, Baroja, Instituto De Ciencias De La Vid Y Del Vino (Gobierno De La Rioja, Csic, Universidad De La Rioja)

Contact the author

Keywords

glutathione, grape, white varieties, location, season

Citation

Response of the plant: a chief element for the characterisation of wine-growing “terroirs”

Face au risque de banalisation des produits agroalimentaires, un intérêt toujours plus marqué se développe en faveur des produits du terroir.

Non-invasive headspace sorptive extraction for monitoring volatile compounds production by saccharomyces and non-saccharomyces strains throughout alcoholic fermentation

Wine is a solution containing abundant volatile compounds which contribute to their aroma. Many of them are produced by yeast as metabolism by-products. Different yeast strains produce different volatile profiles. The possibility of studying the evolution of volatile compounds during fermentation, using sampling methods that not alter the volume of fermentation media, is of great interest. In spite of this, non-invasive methods to monitoring the evolution of volatile profile during fermentation have been seldom used. The goals of this work were to use by first time the headspace sorptive extraction (HSSE) as non-invasive method to monitor the evolution of volatile profiles throughout alcoholic fermentation and to study the changes on volatile profiles produced by Saccharomyces cerevisiae and Lachancea thermotolerans during fermentation of a must with high sugar content.

Challenges and opportunities for increasing organic carbon in vineyard soils: perspectives of extension specialists

Context description and research question: an increasing number of farmers are considering the impact of conservation practices on soil health to guide sustainable management of vineyards. Understanding impacts of soil management on soil organic carbon (SOC) is one lever for adoption of agroecological practice with potential to help maintain or improve soil health while building SOC stocks to mitigate climate change (Amelung et al., 2020).

The Soil Component of Terroir

Evidence for a specific effect of soil mineral composition on wine character is largely anecdotal. However, soil potassium supply to the vine must be properly balanced between deficiency and excess for good fruit quality.

Bio-protection by one strain of M. Pulcherrima: microbiological and chemical impacts in red wines

In oenology, bio-protection consists in adding bacteria, yeasts or a mixture of microorganisms on grape must before fermentation in order to reduce the use of chemical compounds such as sulphites.