Potential of the enological use of several Brazilian wood species on the phenolic composition and sensory quality of different wines

The use of wood species from Brazilian forests has not been the subject of studies on oenology. Thus, the main goal of this study was to carry out a comparative analysis of the impact of several different Brazilian wood species (Jequitibá, Jaqueira, Ipê, Amburana, and Grápia) on global phenolic parameters, chromatic characteristics, and sensory profile of one red and white wines during a short wood contact time. In addition, toasted European oak wood (Q. petraea) was also used. Regarding the specific impact of the use of the different wood species studied, red wines stored in contact during 15 and 30 storage days with Amburana, Grápia, and Ipê wood cubes showed the highest total phenolic content, while for white wines, the highest total phenolic values were detected for the wines stored in contact with Jequitibá, Jaquera, and Amburana wood cubes after 15 storage days. Regarding the sensorial quality, after 30 storage days, red wines stored in contact with Amburana and Jaquera woods obtained the highest global appreciation scores. For white wines, the highest global appreciation scores were obtained for the wines stored in contact with Ipê and Amburana wood cubes for 15 days

Preliminary Study of the Effect of Short Maceration with Cherry and Oak Wood Chips on the Volatile Composition of Different Craft Beers

In the last few years, the production and consumption of craft beers has increased notably. However, there is restricted knowledge about the potential impact of chips from different wood species on beer quality. Thus, this work aimed to evaluate the effect of the addition of wood chips from cherry and oak species—after the fermentation was completed and during a brief maceration time—on the volatile composition of three different beer groups (Ale, Lager, and Porter) through a headspace solid-phase dynamic extraction (HS-SPDE) and GC-MS analysis. Fifty-six volatile compounds from different chemical families (esters, alcohols, terpenes, acids, aldehydes, ketones, and pyrazines) were detected, identified, and considered in this study. In general, the volatile composition of the beers macerated with wood chips was very similar to that of the control beers. However, the control beers showed higher volatile compound levels. The results suggest potential interactions between beer volatile compounds and the wood chips during maceration. The outcomes of this research could be of practical interest to brewers since they could improve the knowledge of the impact of short-time contact and low wood chip concentration on the volatile composition of different craft beers.info:eu-repo/semantics/publishedVersio

Utilização de fragmentos de madeira na evolução de variáveis fenólicas e sensoriais num vinho tinto

O trabalho pretendeu estudar a composição fenólica de fragmentos de madeira de cerejeira, de acácia e de carvalho francês e, ainda, avaliar o impacto desses diferentes fragmentos de madeira na evolução de vários parâmetros fenólicos e no perfil sensorial de um vinho tinto. Os métodos utilizados foram a cromatografia líquida de elevada performance para a avaliação da composição fenólica individual dos fragmentos de madeira e, ainda, diversas variáveis fenólicas gerais do vinho tinto conservado com os fragmentos de madeira. Dos resultados, observa-se menores teores em compostos fenólicos individuais nos fragmentos de madeira de cerejeira e de acácia em comparação com os fragmentos de madeira de carvalho francês. Nas variáveis fenólicas gerais estudadas do vinho conservado com os fragmentos, conclui-se que não existe uma tendência diferenciadora clara entre os vinhos após 30 dias de conservação, não sendo, por isso, possível observar uma influência nítida do tipo de fragmento de madeira utilizado. Em nível sensorial, o vinho conservado com os fragmentos de carvalho francês apresenta pontuações mais elevadas ao nível do aroma de coco, baunilha e madeira, e também na apreciação global.info:eu-repo/semantics/publishedVersio

Evaluación de la composición fenólica y de la actividad antioxidante de peras frescas y secadas al sol (Pyrus communis L.)

Los compuestos fenólicos influyen sobre el color y el sabor de las peras secadas al sol y por tanto en su calidad. Los polímeros tipo de taninos condensados han sido descritos como los máximos responsables de la astringencia de manzanas sidreras (Lea y Arnold, 1978) y es bien conocido que los fenoles son el origen de los pigmentos pardos resultado del pardeamiento enzimático derivado de la actuación de las PPO y las peroxidasas. Un factor interesante a considerar es que se ha sugerido que los fenoles parcialmente oxidados pueden ejercer una actividad antioxidante mayor a la que ejercen los no oxidados (Manzocco et al., 2001). En los últimos años se están aplicando diversos métodos para evaluar la actividad antioxidante (AAO) de alimentos y bebidas, siendo sus principales diferencias el punto final de reacción y la propiedad evaluada (Pellegrini et al, 1999). EL objetivo de este trabajo fue el estudio comparativo del contenido fenólico y de la actividad antioxidante de peras frescas y secadas al sol de las variedades S. Bartolomeu (SB) y Amêndoa . (Pyrus communis L.). La AAO se evaluó aplicando los métodos de DMPD, el ABTS, y el DPPH, expresándose como equivalentes de Trolox y de ácido ascórbico. Se detectaron diferencias cuantitativas entre métodos y entre variedades. La pera SB fue la más rica en compuestos fenólicos dando también mayores valores de AAO. EL secado redujo el contenido de fenoles y también los valores de AAO