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ACE inhibitory activity of β-lactoglobulin (a, b) and WPC derived peptide fractions (c, d). β-lactoglobulin fractions of molecular mass <3 kDa (a), 3–10 kDa (b). WPC fractions of molecular mass <3 kDa (c), 3–10 kDa (d). ACE inhibitory activity was reported as IC50 i.e. the concentration of the inhibitor required to inhibit 50 % of the DPP-IV activity under the assay conditions
