Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/3994
Título: A susceptibilidade de vinhos elementares ao crescimento da levedura Dekkera bruxellensis
Autor: Madeira, Inês Gomes Forte
Orientador: Malfeito Ferreira, Manuel
Palavras-chave: wine
Dekkera
Brettanomyces
spoilage yeasts
volatile phenols
HPLC
Data de Defesa: 2011
Editora: ISA/UTL
Citação: Madeira, Inês Gomes Forte - A susceptibilidade de vinhos elementares ao crescimento da levedura Dekkera bruxellensis. Lisboa: ISA, 2011
Resumo: The goal of this work was to understand the diverse susceptibility of several red wines to the increase and production of phenols by yeast Dekkera bruxellensis ISA 1791. In first place was to evaluate the concentration effect of tannins on the growth, observing a lost of viability increased with enlargement of you concentration, without, however lead to complete cell death. To evaluate the answer of growth and production of 4-etylphenol in wines of elementary grape varieties were used red wines (Touriga Nacional, Syrah, Cabernet Sauvignon and Baga) from different regions (Alentejo, Ribatejo, Bairrada). In case of elementary wines, did not verified growth nor production of 4-etylphenol because of the cell death in less than 24 hours. However, when the values of ethanol were corrected (12%v/v), pH (3.50), total acidity (7 g/l), tannins (IPT 80) and in the absence of free sulphur dioxide was registered an increase of cellular growth as a reply to that same cellular growth in all samples. It was observed one production of 4-etylphenol as reply to that same cellular growth, with income which vary between 140 μg/log CFU in Baga variety and 978 μg/log CFU in Syrah variety in Alentejo.
Descrição: Mestrado em Viticultura e Enologia - Instituto Superior de Agronomia / Faculdade de Ciências. Universidade do Porto
URI: http://hdl.handle.net/10400.5/3994
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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