2-Chloro-4-nitrophenyl-α-d-maltotrioside (93834-100MG), p-nitrophenyl-α-d-glucopyranoside (487506-1GM), α-amylase from porcine pancreas (Type VI-B A3176-2.5MU), and α-glucosidase from Saccharomyces cerevisiae (Type I G5003-1KU) were purchased from Sigma-Aldrich (Milan, Italy). All other reagents used were of the highest grade available, purchased from Sigma-Aldrich (Milan, Italy), and used without further purification.
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