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

[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

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

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

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

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

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)

Notes manuscrites sobre publicacions d'Elvira López Tamames, Rosa María Lamuela Raventós, María Izquierdo Pulido i María Teresa Veciana Nogués

Relacionat amb 24-029

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

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

Comparison of volatile compounds during biological ageing and commercial storage of Cava (Spanish sparkling wine): The role of lees

Cava is a sparkling wine produced using a traditional method that must be aged in contact with lees for a minimum period of nine months. The contact between wine and lees improves the quality of the final product, and aroma is one of the most important qualitative parameters of a wine. The aim of the work was to study the role of lees in the ageing of Spanish sparkling wine (Cava), by sampling at industrial scale the bottles, from 9 to 30 months of ageing, jointly with the winery and in real time. The volatile profile of Cava during biological ageing and commercial storage, after disgorging, was evaluated by Headspace-Solid Phase Microextraction coupled to gas chromatography–mass spectrometry. More than 60 compounds were identified from several chemical classes including esters, alcohols, terpenes, furans, norisoprenoids, and fatty acids. A reduction in volatile components was observed when the disgorging step took place. When the behaviour of aroma over time was assessed, the principal factor that discriminated between samples was the type of ageing i.e. with or without lees. Evaluation of volatiles over time revealed that furans showed a significant relationship with ageing, indicating that some components of this family could be possible markers of ageing

Potential Prebiotic Effect of Cava Lees: Changes in Gut Microbiota

Lees are a winery by-product with a fiber-rich composition that could have a potential prebiotic effect on gut microbiota. Prebiotics cannot be digested by humans but can be used by bacteria found in the large intestine. To evaluate the potential prebiotic effect of lees, they were administered to Wistar rats for 14 days. Feces were collected daily, and DNA was extracted and analyzed by shot gun sequencing. The supplementation with lees did not affect weight, food intake, or water consumption of the studied rats. It was found that lees promoted the increase of relative abundance of probiotic bacteria belonging to the Lactobacillaceae family, as well as other potentially probiotic species such as Blautia hansenii, Roseburia intestinalis, and Ruminococcus obeum. Moreover, lees supplementation also reduced the abundance of certain pathogenic bacteria. In conclusion, lees can improve the presence of beneficial bacteria in the gastrointestinal tract and can be re-valorized as a new ingredient in food formulation

Comparative study of different extraction techniques for the analysis of virgin olive oil aroma

8 pages, 3 figures.Headspace solid-phase microextraction (HS-SPME), simultaneous distillation/extraction (SDE) and closed-loop stripping analysis (CLSA) coupled to gas chromatography/mass spectrometry (GC/MS) were used to study virgin olive oil, with the goal of detecting large numbers of characteristic volatile and semi-volatile compounds. More than one hundred compounds were detected in the olive oil extracts, and their percent amounts obtained by each technique were calculated. Qualitative and quantitative differences of virgin olive oil volatile profiles were observed applying the three extraction techniques. SPME showed a higher affinity for alcohols and ketones, while CLSA achieved the highest percentages of esters and hydrocarbons. Finally, the highest extraction of total terpenoid compounds occurred with SDE and CLSA, where CLSA allowed extracting the highest percentages of the most of them. SDE extraction caused the thermal degradation of the oil sample, which resulted in a high percentage of aldehydic compounds.This study was supported by the Generalitat de Catalunya, project 2005SGR00156; by the Ministerio de Ciencia y Tecnología (MCYT), project AGL2005-03451/ALI; and by the Secretaría de Estado de Educación y Universidades (Ministerio de Educación y Ciencia), Ref. SB2003-0118.Peer reviewe

Potential prebiotic effect of Cava Lees: changes in gut microbiota

Lees are a winery by-product with a fiber-rich composition that could have a potential prebiotic effect on gut microbiota. Prebiotics cannot be digested by humans but can be used by bacteria found in the large intestine. To evaluate the potential prebiotic effect of lees, they were administered to Wistar rats for 14 days. Feces were collected daily, and DNA was extracted and analyzed by shot gun sequencing. The supplementation with lees did not affect weight, food intake, or water consumption of the studied rats. It was found that lees promoted the increase of relative abundance of probiotic bacteria belonging to the Lactobacillaceae family, as well as other potentially probiotic species such as Blautia hansenii, Roseburia intestinalis, and Ruminococcus obeum. Moreover, lees supplementation also reduced the abundance of certain pathogenic bacteria. In conclusion, lees can improve the presence of beneficial bacteria in the gastrointestinal tract and can be re-valorized as a new ingredient in food formulatio