 IVES 9 IVES Conference Series 9 Optimization of a tool to determine the oxygen avidity of a wine through the kinetics of consumption by its phenolic and aromatic fractions (PAFs)

Optimization of a tool to determine the oxygen avidity of a wine through the kinetics of consumption by its phenolic and aromatic fractions (PAFs)

Abstract

AIM: Wine oxidation phenomena during the different processes of winemaking, aging and storage are closely related to the presence of oxygen and to the wine’s capacity for consumption. Grape composition will be directly related to wine composition, defining the O2 consumption rate, with particular importance of phenolic compounds and metal ions content. The prediction of the O2 consumption capacity of a wine could be a great tool to help in decision making during the winemaking process. The objetive of this work was the optimization of the reactivation of phenolic and aromatic fractions of grapes (PAFs) for the study of their avidity to consume oxygen. Beside, the effect of alcohol, pH, acetaldehyde and the metals Fe, Cu and Mn has been studied.

METHODS: Different PAFs reactivated under 16 different conditions defined by different levels of pH, alcohol content, acetaldehyde, iron, Cu and Mn were subjected to an oxygen consumption kinetic after saturation with air (1,2).

RESULTS: The parameters defining the kinetics of consumption allowed us to differentiate the different types of grapes. The greatest discriminatory capacity were the parameters related to the amount of oxygen consumed and the time invested in consuming this amount of oxygen, especially in the first stages or the time required to consume the 10% available oxygen, the area under the curve or the time to reach half-area. Thus, the lower iron content facilitated oxygen consumption, requiring less time, and similar results were found with respect to the presence of Mn.

CONCLUSIONS

The best activation conditions of phenolic and aromatic fractions have been established for the evaluation of different PAFs by developing their oxygen consumption kinetics.

DOI:

Publication date: September 14, 2021

Issue: Macrowine 2021

Type: Article

Authors

Marioli Alejandra, Carrasco-Quiroz

Dpt. Química Analítica, UVaMOX-Group, Universidad de Valladolid, Avda. Madrid, 50, 34004 Palencia, Spain,Rosario, SANCHEZ-GOMEZ Dpt. Química Analítica, UVaMOX-Group, Universidad de Valladolid, Avda. Madrid, 50, 34004 Palencia, Spain Ignacio NEVARES, Dpt. Ingeniería Agrícola y Forestal, UVaMOX-Group, Universidad de Valladolid, Avda. Madrid, 50, 34004 Palencia, Spain Ana MARTINEZ-GIL Dpt. Química Analítica, UVaMOX-Group, Universidad de Valladolid, Avda. Madrid, 50, 34004 Palencia, Spain María Del ALAMO-SANZA, Dpt. Química Analítica, UVaMOX-Group, Universidad de Valladolid, Avda. Madrid, 50, 34004 Palencia, Spain

Contact the author

Keywords

PAFs, activation factors, oxygen consumption kinetics parameters, oenological parameters

Citation

Nucleophilic fraction to estimate the antioxidant activity of inactivated yeast derivates

Oxidation in wine is mostly related to the Michael addition of nucleophiles on two quinones formed from the oxidation of ortho-diphenols. In wine this mechanism is responsible for the increase of the yellow hue and aroma loss. Glutathione exerts its antioxidant activity throughout its competitive addition onto quinones, but many other compounds can have the same behavior: sulfanyl
compounds, amino acids, etc. Addition of yeast derivates during the winemaking process can increase the level of those nucleophilic compounds and then confer to the wine a higher resistance

AOC valorization of terroir nuances at plot scale in Burgundy

In the highly competitive global wine market, Burgundy has a long-established reputation to maintain. The vine and wine sector in Burgundy is based on a five-level ranking of AOC (Appellation d’Origine Contrôlée) wines and of the plots where the grapes are grown.

Les propriétés de réflectance du sol de la parcelle sont à considerer comme des paramètres du terroir

Suite à des expérimentations de solarisation artificielle réalisées en 1999 en conditions réelles de culture, à partir de matériels réfléchissants partiellement colorés en vert, en bleu

Terroir and vine water relation effects on grape ripening and wine quality of Syrah/R99

A Syrah/R99 vineyard in the Stellenbosch area was used. The vineyard is vertically trained and spaced 2.75 x 1.5 m in north-south orientated rows on terroir with Glenrosa soil and west-facing slope. Irrigation (to 100% field water capacity) treatments were applied at different development stages [all stages (including berry set stage); pea size; véraison; post-véraison]. Combined effects of water status and ripeness level were investigated. Preliminary results are presented.

The dynamics of δ13C and δ18O in musts during berries development

Aim: Many processes or reactions that occur in plants involved isotopic discrimination. Water availability, for example, affects the isotopic ratio of carbon (δ13C) and oxygen (δ18O). In viticulture, δ13C is used in experiments related to water relations and irrigation in vineyards. δ18O is used much less but it could be a good complement to δ13C. The aim of this study was to generate knowledge on how these isotopic ratios, measured in musts, could help to better understand the water behavior of grape varieties.