Yerba mate infusion is widely consumed in Argentina, Brazil and Paraguay. One of the processing steps used in Argentina is aging. The following three methods were used to age yerba mate: 1) air humidity and temperature-controlled aging; 2) temperature-controlled aging and 3) no control. The aim of this research was to determine the physicochemical and sensory attribute differences when yerba mate was aged using these three methods. The concentration of caffeine, glucose, fructose, maltose and phenolic compounds and pH diminished in all three aging methods but by different percentages. The sensory attributes did not exhibit uniform behaviour. Astringency remained constant in the first method and diminished in the other two. Bitterness increased in all three methods but by different percentages. Sweetness diminished in all three methods. Notably few correlations were determined between physicochemical and sensory attributes.
El objetivo del presente trabajo fue estudiar la influencia de las condiciones de secado de cápsulas de extracto de yerba mate (Ilex paraguariensis St. Hilaire). Las mismas se obtuvieron aplicando la técnica de gelificación iónica y fueron sometidas a tres condiciones de secado: microondas y secado convectivo a 60 y 80º C. Las isotermas de adsorción obtenidas fueron del tipo sigmoidal y la ecuación de GAB fue la que mejor explicó el comportamiento de los datos experimentales, no encontrándose diferencias estadísticas significativas entre los materiales. Los contenidos de polifenoles totales (CPT) y capacidad antioxidante (CAO) presentaron valores entre 20,12 y 19,68 g EAG/100g ms (masa seca) para CPT, y para la CAO entre 20,47 y 19,45 g EAA/100g ms, no encontrándose diferencias estadísticas significativas. El consumo de 5 g de cápsulas aportaría el 41% del requerimiento diario de calcio. La velocidad de rehidratación fue mayor para las cápsulas secadas con microondas.
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