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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...
Efeito da secagem natural na composição quimica da madeira de castanheiro usada...
Sousa, Raul Bruno de; Canas, Sara; Caldeira, Ilda; Mateus, Ana M.; Belchior, A. Pedro; Climaco, M. CristinaThe ageing of high quality brandies requires a period of storage in wooden barrels. Several studies have showed the great influence of the seasoning process on the characteristics of oak wood and their influence on wines and brandies quality. This study provides, for the first time, specific information about the seasoning effects on portuguese chestnut wood from two different geographical origins, namely on th...
Cinética de impregnação/evaporação e transferência de compostos fenólicos da ma...
Sousa, Raul Bruno de; Canas, Sara; Belchior, A. Pedro; Mateus, Ana M.; Spranger, Maria IsabelAn essay was carried out under model conditions, simulating the natural ageing of brandies in 250dm3 wooden barrels, to study the kinetics of impregnation/evaporation of brandy and the release of phenolic compounds from wood into brandy. The influence of wood botanical species (Limousin oak and portuguese chestnut), toasting level (light and strong)and ageing time (0, 42 and 250 days) was investigated. In paral...
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