Search results for "Veterinary"
showing 10 items of 3026 documents
The effect of glycerol on the perceived aroma of a model wine and a white wine
2001
Abstract Glycerol is one of the most abundant components of wine. In dry wines its concentration is only exceeded by water and ethanol. Several studies have been carried out on the effects of glycerol on mouthfeel, but little attention has been given to glycero–flavour interactions. Consequently, here we have turned our attention to the aroma perception. Purge and Trap analysis and sensory measurements were used to investigate the modifications in volatility of aroma compounds in model solutions and white wine according to their glycerol concentration. In water, the amount of aroma compounds released was not affected by the presence of glycerol concentrations ranging from 5 to 50 g/L. The a…
Vitamins in wine: Which, what for, and how much?
2021
Vitamins are essential compounds to yeasts, and notably in winemaking contexts. Vitamins are involved in numerous yeast metabolic pathways, including those of amino acids, fatty acids, and alcohols, which suggests their notable implication in fermentation courses, as well as in the development of aromatic compounds in wines. Although they are major components in the course of those microbial processes, their significance and impact have not been extensively studied in the context of winemaking and wine products, as most of the studies focusing on the subject in the past decades have relied on relatively insensitive and imprecise analytical methods. Therefore, this review provides an extensi…
Study of product repositioning for the Marsala Vergine DOC wine
2017
Italian production of wine is very diversified and Sicily is one of the major regions with regards to quality and quantity of wine. The Marsala is the oldest fortified Sicilian wine, which is very valuable because of its organoleptic qualities and its production process. Marsala wine has been gaining for over a century in the Italian and foreign market, but, after a century of fame, it entered a long phase of decline because of inappropriate producers' decisions and new competitors. The objective of this study is to investigate strengths, weaknesses, opportunities and treats of Marsala Vergine DOC wine for repositioning the product in the market. The focus group and factor analysis were car…
Application of finger span cross modality matching method (FSCM) by naive assessors for olfactometric discrimination of Gewürztraminer wines
2002
Abstract A gas-chromatography-olfactometric detection (GCO) using a direct estimation of odor intensities with the finger span (FSCM) was used to establish aroma profiles of three wines of gewurztraminer from different ‘terroirs’ of the Alsace region. The GCO-FSCM analyses of their hydroalcoholic wine extracts were performed using a group of untrained assessors. Forty-four olfactory signals were perceived by at least four assessors out of six and their intensities were scored in triplicate in each of the three wine extracts, amongst which ten of them were found discriminant between wines. The reliability of each assessor was studied on the basis of the finger span estimation repeatability, …
Business choices, risk management and distortions in the wine market in the European Union
2020
The objective of this work is to analyze the management of technical and economic risks in agri-food production. It is well established that any business activity is characterized by risks that, if not managed efficiently and effectively, can cause a company’s downward spiral. In this context, the management of a winery requires the adoption of company policies aimed at reducing risk. This study highlights the fact that the wine insurance market is characterized by information asymmetry and adverse selection that contribute to the creation of ‘distorted markets’. The results of the empirical analysis show the collapse of subsidized insurance contracts in viticulture leading to a decrease in…
Application of high Power ultrasounds during red wine vinification
2017
[EN] Wine colour is one of the main organoleptic characteristics influencing its quality. It is of special interest in red vinifications due to the economic resources that wineries have to invest for the extraction of the phenolic compounds responsible for wine colour, compounds that are mainly located inside the skin cell vacuoles, where the volatile compounds are also found. The transfer of phenolic compounds from grapes to must during vinification is closely related to the type of grapes and the winemaking technique. During traditional winemaking, grapes are crushed and skin macerated for several days, with pumps overs to facilitate the colour extraction. To increase this extraction, som…
Characterisation of Vernaccia Nera (Vitis vinifera L.) Grapes and Wine
2017
Vernaccia Nera (VN) is a minor Italian red grape cultivar whose oenological properties have not been investigated yet. Traditional winemaking procedures with VN can include grape drying and even triple sequential fermentations, but a rational vinification approach should be based on the grape composition. Since a comprehensive characterisation of the VN grape is still missing, the ripening of VN grapes was monitored by evaluating flavour compounds, proanthocyanidins and anthocyanins. The grapes were used to produce red wine whose chemical composition and sensory properties were assessed. Ripe VN grapes contained high amounts of extractable anthocyanins (0.88 g/kg). The most abundant anthocy…
Optimal Conditions for the Formation of Sotolon from .alpha.-Ketobutyric Acid in the French "Vin Jaune"
1995
Sotolon (3-hydroxy-4,5-dimethyl-2(5H)-furanone) is a key flavor compound in the French flor-sherry Vin Jaune. Sotolon in Vin Jaune (120-268 microgram/L) is produced during the development of yeast film over a period of 6 years. In a synthetic medium resembling wine, the formation of sotolon was studied for different organic acids and acetaldehyde. Then, sotolon was quantified by HPLC on a Lichrospher 100 Diol column. Under the conditions of temperature, pH, and alcoholic content similar to the ageing of wine in barrels, sotolon was formed by a purely chemical mechanism from alpha-ketobutyric acid and acetaldehyde. The formation of sotolon increases by increasing temperature and decreasing p…
Perceptual interactions between fruity and woody notes of wine
2004
The quantitative olfactory interactions in three binary mixtures of wine aroma compounds were studied. For the first two mixtures, whisky lactone (woody note) was mixed separately with two esters (fruity note), ethyl butyrate and isoamyl acetate. For the third mixture, guaiacol (woody note) was mixed with ethyl butyrate (fruity note). Perceived odour intensity of 24 stimuli (four supra-threshold concentration levels of two compounds and the respective 16 mixtures) were evaluated in five replications, by a trained panel of 13 subjects. The results showed that for the three binary mixtures studied, quantitative perceptual interactions were non-level independent, non-symmetrical, and reached t…
Influence of bentonite fining on protein composition in wine
2017
Abstract Bentonite is the only fining agent which can stabilize wine and prevent protein haze formation after bottling. Currently many approaches are used to find an alternative because of bentonite's negative influence on color and aroma compounds. Nevertheless, the interaction of bentonite with wine proteins is not fully understood. Therefore, we analyzed the influence of a NaCa-combined bentonite on the protein content and composition of different wines showing a partial selectivity on protein adsorption. For example, glycosylated proteins were not removed by bentonite in notable amounts. Performing mass spectrometry we were able to demonstrate that 96% of class IV chitinase was adsorbed…