IVAS 2022 banner
IVES 9 IVES Conference Series 9 IVAS 9 IVAS 2022 9 Gamay And Gamaret Winemaking Processes Using Stems: Impact On The Wine Aromatic Composition.

Gamay And Gamaret Winemaking Processes Using Stems: Impact On The Wine Aromatic Composition.

Abstract

Stems may bring various benefits to the wine such as alcoholic reduction, color protection or improvement of the tannic intensity. Not much used on Swiss grape varieties, the aim of this study was to identify the relevance of using this type of winemaking in the case of Gamay and Gamaret red grape varieties. In this presentation, focus will be done on the aromatic compounds brought to the wine from the stems.
Gamay and Gamaret wines were made according to five modalities: fully destemmed used as control, 20% and 40% either whole grapes or stems added to the rest of the destemmed harvest. The influence of the stems on the wine chemical properties was measured using different classical FTIR and colorimetric methods (alcohol, acidity, pH, SO2 …). Volatile composition of wine was analysed by gas chromatography coupled to  a mass spectrometer (GC-MS). The analysis of compounds with an aroma impact by olfactometry completes these analyses. Sensory analysis were also performed in order to measure the impact on the wines.
To understand the influence of stems, stem extracts were obtained from the same harvest batch using a maceration under simulated alcoholic fermentation protocol. These extracts were also analysed by GC-MS-olfactometry. The analytical results show differences between the aromatic profiles of the Gamay and Gamaret stems alcoholic extracts. The presence of terpene alcohol with floral notes such as linalool, geraniol or α-terpineol are particularly present in the alcoholic extracts of Gamaret stems. Gamay stems extracts have a more complex volatile compounds profile with esters and alcohols (fruity notes) present in greater quantities.
The presence of stems at different percentages and form during winemaking also influences the general aromatic profile of the different modalities.
This study allows us to acquire knowledge about winemaking processes performed using non-destemmed grapes and their impact on the wine characteristics.

DOI:

Publication date: June 23, 2022

Issue: IVAS 2022

Type: Poster

Authors

Blackford Marie1,2, Comby Montaine1,2, Imhof Janina2,Roesle-Fuchs Julie2, Dienes-Nagy Ágnes1, Fuchsmann Pascal1, Lorenzini Fabrice1, Bourdin Gilles1 and Bach Benoit2

1AGROSCOPE
2Changins, Viticulture and oenology, HES-SO University of Applied Sciences and Arts Western Switzerland

Contact the author

Keywords

Stem, whole cluster, winemaking, aromatic compounds

Tags

IVAS 2022 | IVES Conference Series

Citation

Related articles…

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. 

Read More

A comprehensive and accurate annotation for the grapevine T2T genome 

Addressing the opportunities and challenges of genomics methods in grapevine (Vitis vinifera L.) requires the development of a comprehensive and accurate reference genome and annotation. We aimed to create a new gene annotation for the PN40024 grapevine reference genome by integrating the highly accurate and complete T2T assembly and the manually curated PN40024.v4 annotation. Here, we present a novel workflow to enhance the annotation of the T2T genome by incorporating past community input found in PN40024.v4. The pipeline’s containerization will improve the workflow’s reproducibility and flexibility, facilitating its inclusion as a shared workflow on the Grapedia portal, the grapevine genomics encyclopedia.

Read More

Satellite imagery : a tool for large scale vineyard management

Remote sensing, using Near Infra Red wavelength, can characterize within-vineyard variability using vegetation index. Between 2007 and 2009, a study was led on the vineyards of a cooperative winery, in Fitou area (France) aiming at characterizing vineyard oenological potential. A vegetation index, green leaf cover, developed on crops (wheat, rice, corn…) was implemented on vineyards.

Read More

A worldwide perspective on viticultural zoning

Cet article répertorie les intérêts et problèmes du zonage viticole dans une perspective mondiale. Le zonage est un besoin pour chacun des vignobles mondiaux où il correspond à des applications, définitions et approches variées. Les objectifs du zonage changent de concert avec les besoins du marché mondial du vin, qui ne cesse de croître.

Read More

Dalle zonazioni storiche alle “nuove forestazioni storiche produttive vitivinicole” per la valorizzazione delle cultivar e dei prodotti tipici ed originali dei Monti Iblei

Analisi sulle zonizzazioni storiche, sulle produzioni tipiche ed originali e sulla “forestazione classica” per impostare innovative zonazioni vitivinicole e dei prodotti tipici, originali attraverso la “Nuova forestazione storica produttiva”. Le recenti ricerche ed attività svolte sulle zonizzazioni storiche, sulle produzioni tipiche ed originali e sulla “forestazione classica” dei Monti Iblei (Ragusa) (I) hanno permesso di rilanciare le produzioni tipiche ed originali vitivinicole in un innovativo programma integrato tra zonazione (“Grande Zonazione”) e “Nuova forestazione storica produttiva” (“Grande Forestazione Produttiva”) di questo importante territorio.

Read More