Golden Delicious apples were obtained from a local supermarket, and processed in a domestic juice extractor.Ascorbic and citric
acid (800 mg/L and 325 mg/L respectively) were added to the juice
to prevent oxidation and colour change and clarifying enzymes
donated by ENMEX S.A. de C.V. (Mexico, DF, Mexico) were added for
12 h at 4 C.