Capacidad antioxidante y contenido de polifenoles totales en manzanas de distintas variedades cultivadas en Chile
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Se determinó el contenido de polifenoles totales por método de Folin Ciocalteu y capacidad antioxidante por método FRAP, en 3 variedades de manzanas cultivadas en Chile: Granny Smith, Royal Gala y Fuji (enteras y sin piel). El contenido de polifenoles totales en manzanas enteras y sin piel no presenta diferencias significativas. La capacidad antioxidante de la variedad Granny Smith es significativamente mayor que las variedades Royal Gala y Fuji. Se deshidrataron hojuelas de manzana a 60° C por 4 horas y éstas presentaron alto contenido de polifenoles totales. La adición de ácido cítrico y bisulfito de sodio –como agentes antipardeamiento– antes de la deshidratación presentó un efecto protector sobre los polifenoles totales y capacidad antioxidante. Se encontró una correlación entre el contenido de polifenoles totales y capacidad antioxidante en manzanas sin piel (R2 = 0.8081) y manzanas enteras (R2 = 0.7585).
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