26 research outputs found

    Características organolépticas de los vinos base destinados a la elaboración del cava en función de tratamientos tecnológicos prefermentativos

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    [spa] Se han realizado un total de 105 determinaciones químicas y sensoriales, relacionadas principalmente con el color, el gusto y el aroma de mostos y vinos blancos del Penedés y destinados a la elaboración de vino espumoso (Cava). Las muestras analizadas corresponden a un ensayo a escala piloto (vendimia de 1988), a cuatro vinificaciones realizadas a escala industrial (vendimias de 1990 y 1991) y a 28 vinos blancos industriales (vendimias de 1990 y 1991). Estas muestras pretenden poner de manifiesto la posible influencia de distintas tecnologias prefermentativas sobre las características sensoriales resultantes. Las tecnologías estudiadas han sido: el tipo de desfangado (estático y dinámico por filtración), la clarificación, el prensado y el conjunto de prácticas tecnológicas propias de las bodegas elaboradoras. Se ha observado que el desfangado por filtración al vacio produce mayores pérdidas en gran parte de los componentes del mosto, con respecto al desfangado estático por decantación. Estas pérdidas repercuten en las características de los vinos, siendo igualmente drásticas para aquellos parámetros considerados "a priori" positivos (aroma afrutado y floral), como para los negativos (aromas y gustos herbáceos). Asimismo, mediante análisis estadístico multivariante, se ha puesto de manifiesto la gran influencia que tienen el año de vendimia, la variedad de uva y la tecnología asociada a las bodegas elaboradoras (desfangado, prensado, levadura, etc.) sobre la calidad organoléptica de los vinos destinados a la obtención de cava

    Evolución de los compuestos carbonílicos durante la conservación del cava en relación al pardeamiento

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    Tesi de Llicenciatura per a la obtenció del Grau de Farmàcia. Facultat de Farmàcia. Universitat de Barcelona. Director: Concepción Fernández López, Carmen de la Torre Boronat. 1988

    Influence of must racking and fining procedures on the composition of white wine

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    A study of the effects of two kinds of must clarification. settling or filtration by rotary vacuum filter and 5 juice fining treatments (bentonite, potassium caseinate, and combinations: bentonite + gelatin, and bentonite + caseinate + microcrystalline cellulose) on wine characteristics was carried out using must of the white cultivar Parellada. Although the general characteristics (ethanol, color, limpidity, residual sugars, pH and acidity) of Parerllada wines were not modified, some wine components (e.g. nitrogenous substances, phenolic compounds and aroma) were lowered according to the type of must racking and juice fining agent added. The percentage of decrease of wine characteristics due to the pre-fermentative fining agent depends on the type of must racking. Highest losses were recorded when rotary vacuum filters were used for must racking, and when bentonite (0.3-0.5 g/l) was added to the juice as a fining agent before fermentation

    Changes in the Volatile Profile of Wheat Sourdough Produced with the Addition of Cava Lees

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    The volatile fraction is of great importance for the organoleptic quality and consumer acceptance of bread. The use of sourdough improves the sensory profile of bread, as well as the addition of new ingredients to the fermentation. Cava lees are a sparkling wine by-product formed of dead microorganisms, tartaric acid, and other inorganic compounds, rich in antioxidant compounds as well as β-glucans and mannoproteins. The aim of this study was to evaluate the effect of different concentrations of Cava lees (0-2% w/w) on sourdough volatile compounds to re-valorize this by-product of the wine industry. Headspace solid-phase microextraction (HS-SPME) was optimized to study the volatile fractions of sourdoughs. The parameters selected were 60 °C, 15 min of equilibrium, and 30 min of extraction. It was found that the addition of Cava lees resulted in higher concentrations of volatile compounds (alcohols, acids, aldehydes, ketones and esters), with the highest values being reached with the 2% Cava lees. Moreover, Cava lees contributed to aroma due to the compounds usually found in sparkling wine, such as 1-butanol, octanoic acid, benzaldehyde and ethyl hexanoate. Keywords: sourdough, HS-SPME-GC-MS, volatile compounds, Cava lees, wine by-produc

    Inhibition of Biogenic Amines Formation in Fermented Foods by the Addition of Cava Lees

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    Food safety can be compromised by some bioactive compounds such as biogenic amines that can be specially found in fermented foods due to the bacterial decarboxylation of some amino acids by fermentative or spoilage bacteria. Cava lees are a winery by-product rich in fiber and phenolic compounds and previous works have raised their revalorization from a food safety point of view. The aim of the current work was to investigate whether the use of cava lees can help to control biogenic amine formation in bread and fermented sausages. In bread, only very low levels of biogenic amines (putrescine, cadaverine, and/or spermidine) were found, whose content did not vary with the addition of different amounts of lees. However, the addition of lees in fermented sausages significantly reduced the formation of tyramine and cadaverine. In sausages spontaneously fermented and inoculated with Salmonella spp., the presence of cadaverine and putrescine diminished by 62 and 78%, respectively, due to the addition of cava lees. The addition of cava lees phenolic extract also showed an anti aminogenic effect (21% for cadaverine and 40% for putrescine), although in a lesser extent than cava lees. Cava lees and their phenolic extract were shown to be an effective strategy to control the undesirable accumulation of high levels of biogenic amines during the production of fermented products

    Libro de Comunicaciones XII Congreso CyTA-CESIA 2024

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    Congrés organitzat conjuntament per la Universitat Autònoma de Barcelona i la Universitat de BarcelonaEl XII Congreso CyTA CESIA, organizado conjuntamente por las dos universidades públicas de Barcelona que imparten el Grado en Ciencia y Tecnología de los Alimentos: la Universitat Autònoma de Barcelona (UAB) y la Universitat de Barcelona (UB) convoca conjuntamente los congresos de “Ciencia y Tecnología de los Alimentos” (avalado por la Conferencia de Decanos de Ciencia y Tecnología de los Alimentos, www.ccyta.es) y de “Ingeniería de los Alimentos” (CESIA). Este congreso es un punto de encuentro para todos aquellos profesionales relacionados con la ciencia, la tecnología y la ingeniería de los alimentos. El programa científico que se ha diseñado para ello incluye varias sesiones temáticas que abarcan distintas disciplinas relacionadas con la investigación en dicho ámbito. Este evento se complementa con la celebración del IV Congreso CyTA Junior, dirigido a estudiantes y recién titulados. El presente documento recoge todas las comunicaciones orales, oral flash y pósteres presentadas en el XII congreso CyTA-CESIA

    Evaluación de los aprendizajes a las asignaturas de practicas externas del grado de ciencia y tecnología de los alimentos y del máster de desarrollo e innovación de alimentos

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    Memòria final del projecte d'innovació docent 2019pid-ub/008 del Grup d’innovació docent consolidat NUTRICIOPRACTICA-RiDoR (GINDO-UB/167)El objetivo principal de este proyecto de innovación docente ha sido diseñar instrumentos para evaluar el aprendizaje durante la formación práctica de los estudiantes de Prácticas Externas del grado de Ciencia y Tecnología de los Alimentos (CTA) y del Máster de Desarrollo e Innovación De Alimentos (DIA)

    Cava (Spanish sparkling wine) aroma: composition and determination methods

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    Podeu consultar el llibre complet a: http://hdl.handle.net/2445/46988Cava (Spanish sparkling wine) is one of the most important quality sparkling wines in Europe. It is produced by the traditional method in which a base wine is re-fermented and aged in the same bottle that reaches the consumer. The special ageing in contact with lees gives the cava a particular bouquet with toasty, sweet or lactic notes. These nuances could be related with the chemical composition of aroma. The methods required to analyze the flavor of cava are revised. Three approaches are necessary to obtain a wider profile: chemical, olfactometric and sensory
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