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Evaluation of wine colour under accelerated and oak-cask ageing using CIELab and chemometric approaches
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Advisor(s)
Abstract(s)
The present study aims to analyse the evolution of
colour and browning of fortified wines submitted to oak and
accelerated ageing induced by temperature, both traditional
ageing processes of Madeira wines. These wines were follow ed during the first 2 years of ageing and were simultaneously
compared to aged reference samples, in order to disclose if
accelerated ageing favours the wine evolution. The data anal ysis approaches followed two strategies: the first one was
based on the monitoring of wine colour parameters based on
CIELab methodology, while the second strategy adopted an
untargeted approach, taking advantage of all wine information
comprised on the UV-vis spectrum. CIELab results indicated
that the greatest variation (up to 92 %) occurs during the
vinification, since it was observed that wines produced from
the same grape variety (Tinta Negra) acquired different char acteristics already on the vinification processes. All wines
tend to approach the reference samples during ageing, with
the lowest ΔE* value obtained for Malvasia submitted to
canteiro at 2 years of ageing (3.29 units). Sweet Tinta Negra
wines, previously submitted to estufagem, presented the most
pronounced colour change associated with ageing. The multi variate principal component analysis (PCA) model was built
with aged reference samples to evaluate how young wines
acquire the reference wine’s characteristics and revealed that accelerated ageing increases colour evolution and favours the
homogeneity of Malvasia wines.
Description
Keywords
Wine Colour Browning Spectrophotometric data Chemometrics . Escola Superior de Tecnologias e Gestão Faculdade de Ciências Exatas e da Engenharia
Citation
Carvalho, M. J., Pereira, V., Pereira, A. C., Pinto, J. L., & Marques, J. C. (2015). Evaluation of wine colour under accelerated and oak-cask ageing using CIELab and chemometric approaches. Food and Bioprocess Technology, 8(11), 2309-2318. https://doi.org/10.1007/s11947-015-1585-x
Publisher
Springer