19 research outputs found

    Pszczólkowski, Philippo y Consuelo Ceppi de Lecco Manual de Microvinificación. Guía práctica para la elaboración de vinos. Santiago, Ediciones Universidad Católica, 2011 (123 p.) ISBN: 978- 956-14-1214-9

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    Pszczólkowski, Philippo y Consuelo Ceppi de Lecco Manual de Microvinificación. Guía práctica para la elaboración de vinos. Santiago, Ediciones Universidad Católica, 2011 (123 p.) ISBN: 978- 956-14-1214-

    Pszczólkowski, Philippo y Consuelo Ceppi de Lecco Manual de Microvinificación. Guía práctica para la elaboración de vinos. Santiago, Ediciones Universidad Católica, 2011 (123 p.) ISBN: 978- 956-14-1214-9

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    Pszczólkowski, Philippo y Consuelo Ceppi de Lecco Manual de Microvinificación. Guía práctica para la elaboración de vinos. Santiago, Ediciones Universidad Católica, 2011 (123 p.) ISBN: 978- 956-14-1214-

    Post-veraison sunlight exposure induces MYB-mediated transcriptional regulation of anthocyanin and flavonol synthesis in berry skins of Vitis vinifera

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    Anthocyanins, flavan-3-ols, and flavonols are the three major classes of flavonoid compounds found in grape berry tissues. Several viticultural practices increase flavonoid content in the fruit, but the underlying genetic mechanisms responsible for these changes have not been completely deciphered. The impact of post-veraison sunlight exposure on anthocyanin and flavonol accumulation in grape berry skin and its relation to the expression of different transcriptional regulators known to be involved in flavonoid synthesis was studied. Treatments consisting of removing or moving aside the basal leaves which shade berry clusters were applied. Shading did not affect sugar accumulation or gene expression of HEXOSE TRANSPORTER 1, although in the leaf removal treatment, these events were retarded during the first weeks of ripening. Flavonols were the most drastically reduced flavonoids following shading and leaf removal treatments, related to the reduced expression of FLAVONOL SYNTHASE 4 and its putative transcriptional regulator MYB12. Anthocyanin accumulation and the expression of CHS2, LDOX, OMT, UFGT, MYBA1, and MYB5a genes were also affected. Other regulatory genes were less affected or not affected at all by these treatments. Non-transcriptional control mechanisms for flavonoid synthesis are also suggested, especially during the initial stages of ripening. Although berries from the leaf removal treatment received more light than shaded fruits, malvidin-3-glucoside and total flavonol content was reduced compared with the treatment without leaf removal. This work reveals that flavonol-related gene expression responds rapidly to field changes in light levels, as shown by the treatment in which shaded fruits were exposed to light in the late stages of ripening. Taken together, this study establishes MYB-specific responsiveness for the effect of sun exposure and sugar transport on flavonoid synthesis

    Pszczólkowski, Philippo y Consuelo Ceppi de Lecco Manual de Microvinificación. Guía práctica para la elaboración de vinos. Santiago, Ediciones Universidad Católica, 2011 (123 p.) ISBN: 978- 956-14-1214-9

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    Pszczólkowski, Philippo y Consuelo Ceppi de Lecco Manual de Microvinificación. Guía práctica para la elaboración de vinos. Santiago, Ediciones Universidad Católica, 2011 (123 p.) ISBN: 978- 956-14-1214-

    Manual de Microvinificación: Guía práctica para la elaboración de vinos

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    Pszczólkowski, Philippo y Consuelo Ceppi de Lecco Manual de Microvinificación. Guía práctica para la elaboración de vinos. Santiago, Ediciones Universidad Católica, 2011 (123 p.) ISBN: 978- 956-14-1214-

    Estabilización Tartárica de Vinos Tintos Mediante Resinas de Intercambio Catiónico

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    Se evaluó la efectividad de resinas (C239 COTACO) de intercambio catiónico en ciclo ácido para estabilizar vinos tintos respecto a tartratos dentro de los limites estipulados por la ¿Office International de la Vigne et du Vin¿ (OIV). Vinos inestables, tratados o sin tratar previamente por frío fueron sometidos a intercambio catiónico y mezclados en porcentajes crecientes con el vino original. Una mezcla de 20% de vino sometido a intercambio con un 80% de vino sin tratar fue suficiente para asegurar la estabilidad de vinos tratados previamente por frío. Este tratamiento permitió conservar las cualidades sensoriales y químicas dentro de los límites de la OIV. A pesar de alteraciones de composición sobre lo tolerado por la OIV, fue imposible obtener la estabilización tartárica del vino por intercambio catiónico cuando estos no recibieron previamente el tratamiento de frío

    Color Indexes: Traditional and Advanced Methods

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    Color is a relevant wine sensory feature easily perceived by wine consumers and directly associated with its quality. Both red and white wines present the polyphenols as the primary chemical compound responsible for wine color. In red wines, the principal component responsible for their color is the anthocyanin located in the vacuole of the cells in the grape berry skin. On the other hand, the characteristic pale-yellow color in white wines is due to enzymatic reactions affecting polyphenolic compounds such as hydroxycinnamic acids, flavanols, and flavonols, followed by non-enzymatic browning produced by oxidation reactions. Due to the importance of color for wine quality, its management and control are crucial for the wine industry. Usually, wine color is determined using two different spectrophotometric approaches, measurement of color density, and description of color in the CIELAB space, which is detailed in the present chapter. Color density measurement is the most widely used method and is recommended by the International Organiza-tion of Vine and Wine (OIV)

    Influencia del Nivel de Carga y Microclima Sobre la Composición y Calidad de Bayas, Mosto y Vino de Cabernet-Sauvignon

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    En un experimento que se llevó a cabo durante la temporada 1999-2000 en Alto Jahuel, Chile, se evaluaron los efectos de tres niveles de carga (100, 66 y 33%) y tres niveles de exposición de los racimos (normal, sombra y expuesto) sobre los componentes del rendimiento y la composición y calidad de las bayas y el vino de Cabernet- Sauvignon. Todos los tratamientos fueron cosechados en la misma fecha, con un grado de sobremadurez más avanzado en los tratamientos con menor nivel de carga y mayor superficie foliar bien iluminada. Los niveles de carga y de microclima no afectaron componentes del rendimiento como peso de bayas y peso de racimos. La acidez total del mosto fue superior y el pH, contenido de potasio y matiz menores en plantas con mayor carga. No hubo diferencias entre mostos provenientes de microclimas distintos en esos parámetros. El microclima influyó sobre el tenor de azúcar y la intensidad colorante del vino. El nivel de carga afectó principalmente a la madurez de las bayas y la magnitud de los efectos estuvo estrechamente relacionada con la superficie foliar expuesta y el nivel de radiación incidente

    Effect of Cladosporium rot on the composition and aromatic compounds of red wine

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    High incidences of Cladosporium rot frequently occur (over 50% infected berries per clusters) in delayed harvests in Cabernet Sauvignon and other red cultivars of Vitis vinifera in Chile. The objective of this study was to determine the effect of Cladosporium rot (Cladosporium cladosporioides and C. herbarum) on composition and aroma of red wine. Cabernet Sauvignon and Carménère wines made with 50% of Cladosporium rot infected grapes (CRG) were characterized and compared with wines made identically with apparently healthy grapes (AHG). Wine composition, color, and aroma were determined and the wines were subjected to sensory evaluation. Differences in volatile acidity, residual sugar, anthocyanins, color hue, and tannins between CRG wines and AHG wines of both Cabernet Sauvignon and Carménère were significant (
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