terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Options to replace or reduce the sulphite content in Tannat red wines produced with minimal intervention

Options to replace or reduce the sulphite content in Tannat red wines produced with minimal intervention

Abstract

Several Uruguayan wineries have begun to produce wines with minimal intervention, to increase the sustainability of their vineyards and wines. These wines are characterized by the minimum intervention in the management of the vineyard, its harvest, vinification, conservation and aging1,2. Sulfur dioxide (SO2) is not used or is used in reduced doses, although chitosan can be substituted or supplemented1. The objective of this research is to evaluate SO2reduction or replacement options adapted to the production of Tannat red wines with minimal intervention. Vinification of the Tannat grapes with autochthonous yeasts (LN) was carried out during the 2023 vintage. Treatments to reduce SO2 (SO2r=30mg/hl), chitosan (Q=10mg/hl), SO2r and chitosan (SO2r+Q) and a treatment without aggregate (SA). Also, a vinification was carried out with selected yeasts and usual doses of SO2 (VT). Fermentation kinetics and the composition of the devatted wine were analyzed, and microbiological evaluations of aerobic mesophiles, lactic acid bacteria (LAB), acetic acid bacteria (AAB) and yeasts were carried out during fermentation and devatting. The initial counts of each microbial group did not present differences between treatments. The AABs were only present at the beginning of the fermentation. Towards the end of fermentation, a decrease was observed in all populations in all treatments, except BAL in vinifications with SA. The yeast count in the SA treatments was higher than that observed in VT. The fermentation kinetics of the musts with LN was slower than with VT. The VT and SO2r+Q wines had higher alcohol and malic acid content, while the Q and SA wines had higher volatile acidity, lactic acid content and residual sugars upon devatting. Our results suggest that reduced doses of SO2 with chitosan maintain the characteristics of the wine in relation to traditional winemaking and may be a viable alternative to improve its conservation.

Acknowledgements: The researchers thank the Agenicia Nacional de Investigación e Innovación for the financial support of the project Evaluation of options to reduce the content of added sulfites in Tannat red wines.

References:

  1. Galati, A., Giorgio, S., Crescimanno, M., Migliore, G., 2019. “Natural wine” consumers and interest in label information: an analysis of willingness to pay in a new Italian wine market segment. Clean. Prod. 227, 405-413. https://doi.org/10.1016/j.jclepro.2019.04.219
  2. Giacomarra, M., Galati, A., Crescimanno, M., Tinervia, S., 2016. The integration of quality and safety concerns in the wine industry: the role of third-party voluntary certifications. J. Clean. Prod. 112 (1), 267-274. https://doi.org/10.1016/j.jclepro.2015.09.026.

DOI:

Publication date: October 13, 2023

Issue: ICGWS 2023

Type: Poster

Authors

Piccardo D.1, González M. 1, Favre G. 1, Clara A. 1, Olivera J. 1, González-Neves G. 1

1Unidad de Tecnología de los Alimentos. Facultad de Agronomía. Udelar. Garzón 780, Montevideo, Uruguay.

Contact the author*

Keywords

Tannat, natural method wine, sustainable viticulture

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

INTEGRAPE guidelines and tools: an effort of COST Action CA17111

INTEGRAPE was a European interdisciplinary network for “data integration to maximize the power of omics for grapevine improvement” (CA17111, https://integrape.eu/), funded by the European COST Association from September 2018 to 2022. This Action successfully developed guidelines and tools for data management and promoted the best practices in grapevine omics studies with a holistic future vision of: “Imagine having all data on grapevine accessible in a single place”.

Read More

Discovering the process of noble rot: fungal ecology of grape berries during the noble rot transformation in different vineyards of the Tokaj wine region

Botrytis cinerea, a well-known grapevine pathogen, has more than 1200 host plants causing grey rot in grapevine berries. However, it can also result in a desirable phenomenon called noble rot under specific microclimate conditions. An extraordinary demonstration of this natural process can be observed in the creation of aszú wines within Hungary’s Tokaj wine region. Beside B. cinerea other fungi and yeasts are involved in the secondary metabolic development of the grape berry which contributes to the sensory and analytical characterization of noble rot wines.

Read More

The tolerance of grapevine rootstocks to water deficit is related to root morphology and xylem anatomy traits 

Climate change is altering water balances, thereby compromising water availability for crops. In grapevine, the strategic selection of genotypes more tolerant to soil water deficit can improve the resilience of the vineyard under this scenario. Previous studies demonstrated that root anatomical and morphological traits determine vine performance under water deficit conditions. Therefore, 13 ungrafted rootstock genotypes, 6 commercial (420 A, 41 B, Evex 13-5, Fercal, 140 Ru y 110 R), and 7 from new breeding programs (RG2, RG3, RG4, RG7, RG8, RG9 and RM2) were evaluated in pots during 2021 and 2022.

Read More

Green pruning of shoots to force new sprouting of buds, in fruit set and in pea size: vegetative, productive and maturation effects, in cv. Verdejo

The context of climate crisis leads to the acceleration of technological ripening of grapes, with unsuitable loss of acidity, so various vineyard management alternatives are being considered to delay the grape ripening. The delay of the vegetative cycle towards a period of milder temperatures affects ripening, but vine behavior can vary according to the area, conduction, watering, variety, etc. A work is proposed to know the response to the green pruning of shoots, executed in fruit set and in pea size, in cv. Verdejo.

Read More

Irrigation frequency in four grapevine red varieties in Spain. Effect on must volatile composition

The irrigation water management in the vineyard is a crucial aspect to obtain sustainable quality production over time. Previous studies have set the water requirements to be applied in the vineyard at 30 % of the reference evapotranspiration (ET0), although there are no studies that settle the effects of the frequency of irrigation application on red varieties in Spain. The present study contemplates the application of deficit irrigation (30 % ET0) applying a weekly dose in a single irrigation (T07) or in two irrigation events (T03) per week. The study has been carried out in 2021-2022 with four red varieties in different Spanish wine regions: Garnacha Tinta (Badajoz), Tempranillo (Valladolid), Syrah (Albacete) and Mencía (Lugo). The effects of irrigation frequency on must volatile composition have been evaluated through GC-MS.

Read More