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…

Irrigation as a tool for heatwave mitigation: the effect of irrigation intensity and timing in Cabernet Sauvignon

Heatwave events, defined as 2 or more days reaching ≥ 38 °C, are an increasingly frequent phenomenon threatening grape production worldwide. Heat stress has been shown to have negative consequences on grapevine physiology, leading to increased evaporative demand and intensified water stress. Due to heatwaves overlapping with important stages of grapevine reproductive development, spanning from berry set to the ripening stage, severe heat can potentially compromise yield and grape quality. The physiological response of grapevine to heat stress suggests a potential use of irrigation to mitigate heatwaves, however there is limited information regarding the irrigation amounts and timings needed for this purpose. Following up on a pivotal trial conducted between 2019 and 2022, in this study irrigation treatments with varying intensity and timing of application were refined to determine their potential mitigation of heat-associated damage to yield and fruit composition.

Read More

Short-term relationships between climate and grapevine trunk diseases in southern French vineyards

[lwp_divi_breadcrumbs home_text="IVES" use_before_icon="on" before_icon="||divi||400" module_id="publication-ariane" _builder_version="4.19.4" _module_preset="default" module_text_align="center" module_font_size="16px" text_orientation="center"...
Read More

Significance of factors making Riesling an iconic grape variety

Riesling is the iconic grape variety of Germany and accounts for 23% of the German viticulture acreage, which comprises 45% of the worldwide Riesling plantings. Riesling wines offer a wide array of styles from crisp sparkling wines to highly concentrated and sweet Trockenbeerenauslese or Icewines. However, its thin berry skin makes Riesling more vulnerable to detrimental environmental threats than other white wine varieties.  

Read More

L’Appellation d’Origine Contrôlée « Huile Essentielle de Lavande de Haute Provence »

Depuis des siècles, la lavande est utilisée pour son parfum et pour ses vertus thérapeutiques naturelles.

Read More

INVESTIGATION INTO MOUSY OFF-FLAVOR IN WINE USING GAS CHROMATOGRAPHY-MASS SPECTROMETRY WITH STIR BAR SORPTIVE EXTRACTION

Mousy off-flavor is one of the defects of microbial origin in wine. It is described as a particularly unpleasant defect reminiscent of rodent urine (a “dirty mouse cage”), and grilled foods such as popcorn, rice, crackers, and bread crust. Prior to the 2010s, mousiness was very uncommon but it has been becoming more frequent in recent years. It is often associated with an increase in pH as well as certain oenological practices, which tend to significantly decrease the use of sulfur dioxide.

Read More