EFECTO DE LA MICROOXIGENACIÓN, LA CRIANZA SOBRE LIAS Y LA ADICIÓN DE PREPARADOS DE LEVADURA SECA INACTIVA, EN LA COMPOSICIÓN POLIFENÓLICA DE LOS VINOS TINTOS DE BOBAL
[EN] Bobal, the majority in the Utiel-Requena, variety has always been considered as a variety less noble to obtain quality red wines. The development of new winemaking techniques (micro-oxygenation, aging on lees, adding inert experimental yeast preparations) may lead to an improvement in the polyp...
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| Format: | doctoral thesis |
| Publication Date: | 2016 |
| Country: | España |
| Institution: | Universitat Politècnica de València (UPV) |
| Repository: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Language: | Spanish |
| OAI Identifier: | oai:riunet.upv.es:10251/62186 |
| Online Access: | https://riunet.upv.es/handle/10251/62186 |
| Access Level: | Open access |
| Keyword: | Vino Bobal Calidad Polifenoles Astringencia Microoxigenación Crianza sobre lías Levaduras inertes Manoproteínas TECNOLOGIA DE ALIMENTOS |
| Summary: | [EN] Bobal, the majority in the Utiel-Requena, variety has always been considered as a variety less noble to obtain quality red wines. The development of new winemaking techniques (micro-oxygenation, aging on lees, adding inert experimental yeast preparations) may lead to an improvement in the polyphenolic composition of their wines and better stability over time and to establish a suitable production process. For that, Bobal grape variety of field experiences "Coloraos" EVER Requena (Valencia Provincial Council) were collected during three seasons, being produced traditionally in the winery Center. Once the malolactic fermentation the wine was decanted clean a number of containers to experience both steel (twenty seven) as barrels (six), All the experiences were performed in triplicate. Three steel tanks witnesses acted without treatment; three 10% of the lees was added previously taken; six were subjected to micro-oxygenation and three of them also added 10% lees; in the remaining fifteen five different commercial preparations inert yeast was added. All containing lees or commercial preparations were removed three times a week (batonage). Six oak barrels, three of them remained a witness and the rest 10% lees was added Then, the wines with lees were removed three times a week. Monthly samples were taken to determine their polyphenolic composition and its variation over time for six months. The results show that wines aged on lees and mixed with inactive dry yeast had low astringency, mouthfeel and creaminess sensation by the level of polysaccharide-tannin binding whereas had a greater fall color. The aging in barrels with lees and micro-oxygenation in the presence of lees favor maintaining the level of polyphenols with low astringency and good level of complex polysaccharide-tannin structure and increases the smoothness of the wines |
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