Search results for " wine."
showing 10 items of 331 documents
Molecular Mechanisms Involved in the Adaptive Evolution of Industrial Yeasts
2006
Evaluating consumers' willingness to buy environmentally friendly wines: A store experiment
2014
poster + communication courte confidentiels; The French program Ecophyto 2018 aims at achieving a 50% reduction in pesticide use by 2018. The vine-growing sector being the second largest user of pesticides in France, there is a strong need for French vine-growers to engage in more environmentally sustainable practices. However, they will do so if they are sure that consumers are ready to buy environmentally friendly wines. Thus, the two main objectives of this study were to identify consumers' willingness to buy environmentally friendly wines and to estimate the impact of an information campaign. 220 wine consumers participated in the study. Each consumer came twice, at a 3-week interval, i…
How do French consumers perceive organic labels in wine?
2011
International audience
Combining Olfactory and Gustatory Clues in the Judgment of Aging Potential of Red Wine by Wine Professionals
2010
International audience; The study was aimed at determining the relative importance of olfactory and gustatory information for the vin de garde concept, which refers to wine that is intended for aging. First, the study investigated how olfactory information contributed to the assessment of the aging potential of young wine. Burgundy wine professionals categorized 26 red wines (vintage 2005) according to their aging potential in two experimental conditions: orthonasal evaluation and overall evaluation. Second, the aromatic notes associated with wines perceived with an aging potential were examined. A trained descriptive panel described the odor of the 26 red wines to determine whether the win…
Contribution to the molecular study of the oxidative stability of white wines of Burgundy
2019
In order to understand and control the aging of wines, particularly white wines, it is necessary to deepen our knowledge about the physico-chemical mechanisms of oxidation related to oxygenation processes. For this, it is important to have tools to quantify the antioxidant capacity of white wines, and to identify the compoiunds involved, in order to anticipate the aging ability of a wine.In this study, analyzes of the antioxidant capacity by DPPH and Electron Paramagnetic Resonance (EPR) were carried out on a large number of wines during aging and from several vintages, in parallel with metabolomic analyzes, mainly carried out by Liquid Chromatography Coupled to Mass Spectrometry (UPLC-Q-TO…
REPRESENTATION S DES VINS ROUGES DE BOURGOGNE CHEZ LES ACTEURS DE LA FILIERE : UN EFFET AMONT vs AVAL ?
2014
International audience; Les différents segments de professionnels de la filière vitivinicole partagent-t-ils les mêmes représentations vis-à-visdes vins rouges de Bourgogne? Tel le est la question à laquelle nous avons souhaité répondre. Afin d’évaluer dans un premier temps le degré de convergence des réponses sensorielles, visuelles et olfacto-gustatives, deux familles d’acteurs de la filière bourguignonne ont été étudiées: celle des professionnels amont(viticulteurs, œnologues,techniciens) et celle des professionnels aval (restaurateurs,sommeliers,cavistes, commerciaux grande distribution). L’approche sensorielle convoquée ici reposait sur la mesure intrinsèque d’exemplarité. [1]Pour ce f…
Engineering a Saccharomyces cerevisiae Wine Yeast That Exhibits Reduced Ethanol Production during Fermentation under Controlled Microoxygenation Cond…
2006
ABSTRACTWe recently showed that expressing an H2O-NADH oxidase inSaccharomyces cerevisiaedrastically reduces the intracellular NADH concentration and substantially alters the distribution of metabolic fluxes in the cell. Although the engineered strain produces a reduced amount of ethanol, a high level of acetaldehyde accumulates early in the process (1 g/liter), impairing growth and fermentation performance. To overcome these undesirable effects, we carried out a comprehensive analysis of the impact of oxygen on the metabolic network of the same NADH oxidase-expressing strain. While reducing the oxygen transfer rate led to a gradual recovery of the growth and fermentation performance, its i…
Sensory methodology developed for the investigation of sciaccarello wine concept
2004
<p style="text-align: justify;">The aim of the present work was to underline the existence of a sensory space relevant to Sciaccarello wines. Twenty-eight wines were selected for viticultural and enological characteristics, using 1/2 Sciaccarello/Non- Sciaccarello ratio. Sensory analyses (orthonasal then overall perceptions) were performed with a panel composed of seventeen judges. All of the judges were experienced in Sciaccarello wines knowledge. Statistical treatment by PCA was first carried out to display the consensus between the assessors. ANOVA was performed to discriminate accurate and inaccurate examples of Sciaccarello wines. This study demonstrated the existence of the sens…
Improving the Aromatic Profiles of Catarratto Wines: Impact of Metschnikowia pulcherrima and Glutathione-Rich Inactivated Yeasts
2023
Catarratto is one of the most widely cultivated grape varieties in Sicily. It is an indigenous non-aromatic white grape variety. Despite its widespread use in winemaking, knowledge of the aroma and chemical and microbiological properties of Catarratto wines is quite limited. The influence of Metschnikowia pulcherrima combined with Saccharomyces cerevisiae on the aromatic expression of Catarratto wines was investigated with and without the addition of glutathione-rich inactivated yeast. The substance is a natural specific inactivated yeast with a guaranteed glutathione level used to limit oxidative processes. The aromatic profiles of the final wines were determined through analysis of the vo…
Green and Quick Extraction of Stable Biophenol-Rich Red Extracts from Grape Processing Waste
2021
The extraction of grape processing waste (wine pomace) via microwave-hydrodiffusion and gravity (MHG) from three different cultivars grown in Sicily (Syrah, Perricone and Nero d&rsquo;Avola) rapidly affords aqueous extracts highly concentrated in valued biophenols including flavonoids, anthocyanins and phenolic acids. The method does not employ organic solvent, acid or base and does not require grinding or freeze drying of the wine pomace nor separation of the grape skins from seeds and stem. All the extracts have a pronounced stability as shown by their red-violet color fully retained after storage for more than a year (15 months) in freezer under air. Concentrations of phenolics up to…