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Orientador(es)
Resumo(s)
The effect of some viticultural parameters on the grape carotenoid profile was investigated. Grape
cultivar, ripeness stage, sunlight and shade exposure, altitude, and vegetative height were studied.
Differences between cultivars were observed in eight different black grape varieties: Touriga Brasileira
(TBR), Tinta Barroca (TB), Tinta Amarela (TA), Souza˜o (S), Touriga Franca (TF), Touriga Nacional
(TN), Tinta Roriz (TR), and Tinto Ca˜o (TC), from the Douro region. TA and TBR clearly produced
higher concentrations of carotenoids. Results showed that carotenoid content decreased during
ripening. Decreases of lutein were observed until 66%, whereas â-carotene slowly decreased, having
a constant level until the harvest date. Carotenoid contents were consistently higher in grapes exposed
to shade than in those exposed to direct sunlight in both studied white grape varieties, Maria Gomes
(MG) and Loureiro (L). In the Douro Valley, high-elevation terraces, which presented a lower
temperature and higher humidity during the maturation period, appeared to produce grapes with higher
carotenoid values. Grapes grown with higher vegetative height seem to have higher carotenoid levels;
furthermore, grapes grown with lower vegetative height had higher weight and sugar concentrations.
Descrição
Palavras-chave
Vitis vinifera Carotenoids Cultivars Sunlight and shade Altitude Vegetative height Berry
Contexto Educativo
Citação
OLIVEIRA, Carla...[et al] - Effect of Some Viticultural Parameters on the Grape Carotenoid Profile. Journal of Agricultural and Food Chemistry. ISSN 0021-8561. Vol. 52 (2004), p. 4178-4184
Editora
American Chemical Society