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Inhibitory activities (IC50 values) of the HPCCC subfractions of red grape JC anthocyanin fraction (RG-AF) and red grape JC copigment fraction (RG-CF) in comparison to the positive control (PC) acarbose. Results are presented as means ± SD (n = 3). (a) RG-AF α-amylase assay (F4, F5: N/A), (b) RG-CF α-amylase assay, (c) RG-AF α-glucosidase assay, and (d) RG-CF α-glucosidase assay. N/A = not available.
