IVAS 2022 banner
IVES 9 IVES Conference Series 9 IVAS 9 IVAS 2022 9 Peptides diversity and oxidative sensitivity: case of specific optimized inactivated yeasts

Peptides diversity and oxidative sensitivity: case of specific optimized inactivated yeasts

Abstract

Estimation of the resistance of a wine against oxidation is of great importance for the wine. To that purpose, most of the commonly used chemical assays that are dedicated to estimate the antioxidant (or antiradical) capacity of a wine consist in measuring the capacity of the wine to reduce an oxidative compound or a stable radical. In the must/wine matrix, polyphenols are major compounds likely to react with oxidant or radical, but such reaction generate quinones that then are involved in varietal aroma loss via nucleophilic addition reaction. It raises the paradox that a good antioxidant capacity does not imply a good protection of such sensitive compounds as aromatic compounds which are wine key quality markers.

The authors have developed a methodology focusing on the survival time of a sensitive compound to estimate the oxidative sensitivity of a solution. A labeled nucleophile is monitored by UHPLC-ESI-Q-ToF MS periodically for hours (from 0.5h to 72h) after a chemical initiation of oxidation in wine model solution containing 4-methylcatechol. 7 Cystein containing peptides (alone or in combination) are used to artificially increase the nucleophilic environment (and thus the competition for quinone nucleophilic addition) and estimate the half-life of the labeled nucleophile. In addition, soluble fraction released by different inactivated yeasts are also used as complex source of nucleophiles.

Half-life of the labeled compound is the final expression of several complex mechanisms such as nucleophilic competition, but also oxygen consumption, or catechol reduction.
Independently of the mechanisms, we can observe that increasing the nucleophilic environment improve the half life of the labeled nucleophile. It is notably visible for the specific optimized inactivated yeast which released many cysteine-containing peptides.
Finally, this method relies on the fate of one sensitive nucleophile to estimate the sensitiveness of the whole matrix to oxidation. It estimates the half-life of this compound which allows to compare oxidative sensitivity of different matrices under specific oxidation conditions.

DOI:

Publication date: June 23, 2022

Issue: IVAS 2022

Type: Article

Authors

Bahut Florian1, Sieczkowski Nathalie1, Nikolantonaki Maria1 and Gougeon Régis D.1

1Univ. Bourgogne Franche-Comté, AgroSup Dijon, PAM UMR A 02.102, Lallemand SAS, Institut Universitaire de la Vigne et du Vin – Jules Guyot, F-21000 Dijon, 19 rue des Briquetiers, BP 59, 31 702 Blagnac, France

Contact the author

Keywords

Nucleophile, oxidation, wine, peptide, diversity

Tags

IVAS 2022 | IVES Conference Series

Citation

Related articles…

Improving stilbenes in vitis Labrusca L. Grapes through methyl jasmonate applications

Grapes (Vitis sp.) are considered a major source of phenolic compounds such as flavonols, anthocyanins and stilbenes. Studies related to the beneficial effects of these compounds on health have encouraged research aimed at increasing their concentration in fruits. On this behalf, several plant growth regulators such as jasmonic acid and its volatile ester, methyl-jasmonate (MeJa), have demonstrated promising results in many fruits. However, Brazilian subtropical climate might interfere on treatment response. The present study aims to evaluate the application of MeJa in the pre-harvest period in Concord and Isabel Precoce grapes (Vitis labrusca L.).

Read More

From plant water status to wine flavonoid composition: a precision viticulture approach in a Sonoma county vineyard

Plant water status of grapevine plays a critical role in affecting berry and final wine chemical composition. The environmental variabilities existing in vineyard system have significant impacts on plant water status, but it is challenging to individualize environmental factors from the temporal and spatial variabilities in vineyard. Therefore, there is need to monitor the ecophysical variation through utilizing precision viticulture tools in order to minimize the separation in berry composition. This study aims at delineating vineyard into different management zones based on plant water status explained by soil texture, and utilize differential harvest to equilibrate the final berry and wine composition.

Read More

D-wines: use of LC-MS metabolomic space to discriminate italian mono-varietal red wines

Studying wine metabolome through multiple targeted methods is complicated and limitative; since grapes, yeasts, bacteria, oxygen, enological techniques and wine aging collaborate to deliver one of the richest metabolomic fingerprint.

Read More

Study of intramolecular distribution of hydrogen isotopes in ethanol depending on deuterium content of water and the origin of carbohydrates

The paper presents the results of consistently developing studies carried out in 2022-2024 on the distribution of deuterium 2H(D) in intracellular water of grapes and wine products, taking into account the influence of natural, climatic and technogenic factors using high-resolution quantitative nuclear magnetic resonance spectroscopy 2H(D)-qNMR.

Read More

The impact of differences in soil texture within a vineyard on vine development and wine quality

Marlborough Sauvignon Blanc has rapidly gained an international reputation for style and quality. The extent to which this can be attributed to the climate, soils or vineyard management is at present unclear. However, the young alluvial soils of the Wairau Plains are considered to play an important role in determining this unique wine style. Marked changes in soil texture occur on the Wairau Plains over short distances.

Read More