Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.13/907
Título: Changes in volatile composition of Madeira wines during their oxidative ageing
Autor: Câmara, José de Sousa
Alves, Maria Arminda
Marques, José Carlos
Palavras-chave: Volatile compounds
Wine aroma
Madeira wines
Faculdade de Ciências Exatas e da Engenharia
Data: Mar-2006
Editora: Elsevier
Citação: Câmara, J. S., Alves, M. A., & Marques, J. C. (2006). Changes in volatile composition of Madeira wines during their oxidative ageing. Analytica Chimica Acta, 563(1), 188-197.
Resumo: The influence of the age in the volatile composition of Madeira wines made with Boal, Malvazia, Sercial and Verdelho varieties and aged in oak barrel during 1, 11 and 25 years old was been studied. For this purpose, the evolution of volatile compounds: higher alcohols, ethyl esters, fatty acids, furan compounds, enolic compounds, γ-lactones, dioxanes and dioxolanes, of the four most utilised varieties were determined using liquid–liquid extraction with dichloromeihane. Octan-3-ol was used as internal standard. The wines made with these varieties showed great differences in sugar content and small variations on pH and alcoholic degree. The results show that during ageing, the concentration of fatty acids ethyl esters, acetates and fatty acids decrease significantly contrarily to the great increase of ethyl esters of diprotic acids. There is a strong correlation between sotolon, 2-furfural, 5-methyl-2-furfural, 5-hydroxymethyl-2-furfural and 5-ethoxymethyl-2-furfural with wine ageing. These findings indicate that these compounds can be used as ageing wine markers. Among the molecules studied, sotolon [3-hydroxy-4,5-dimethyl-2(5H)-furanone] was one of the few molecules present in concentrations above the perception threshold in Madeira wines. 5-Eihoxymethyl-2-furfural formed from 5-hydroxymethyl-2-furfural and 2-furfural, derived from sugars, are also involved in the aroma of sweet fortified white wines aged in oxidative conditions. The sensory properties change significantly after long periods of conservation.
Peer review: yes
URI: http://hdl.handle.net/10400.13/907
DOI: 10.1016/j.aca.2005.10.031
Aparece nas colecções:Artigos em revistas internacionais

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