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Chemical characterization and antioxidant activities of oligomeric and polymeri...
Spranger, Isabel; Sun, Baoshan; Mateus, Ana M.; Freitas, Vitor; Ricardo-da-Silva, Jorge M.Two procyanidin fractions, namely oligomers and polymers isolated from grape seed methanolic extract were characterized. Phenolic composition and procyanidin purity of these fractions were determined by normal-phase and reverse-phase HPLC, thioacidolysis-HPLC, ESI-MS analyses, formaldehyde–HCl precipitation and elemental analysis. Antioxidant activities of these fractions and other wellknown antioxidants were m...
Alterações ao longo da maturação nos taninos condensados da grainha, pelicula e...
Laureano, Olga; Ricardo-da-Silva, Jorge M.; Ó-Marques, João do; Reguinga, RuiThe purpose of the present work was to study the evolution of condensed tannins according to their degree of polymerization in seeds, pulp and skins, along the maturation using Cabernet Sauvignon and Tinta Roriz (Vitis vinifera L.) varieties. Additionally for this study a witness of each variety was compared with two modalities of fruit pruning, one of 50% and another one of 75%.
Licores de uva. Optimização da sua formulação, caracterização físico-quimica e ...
Laureano, Olga; Ricardo-da-Silva, Jorge M.; Sousa, Isabel; Ferreira, Alexandre M.Ce travail a recherche à optimiser la formulation de liqueurs faites a partir de raisin blanc et de raisin rouge à l'aide d'une delineation experimentale du type "centrale composite rotatable design" avec 3 variables en 5 niveaux.
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