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Photographic images (A) and UV–vis absorption spectra; (B) of AuNPs in the presence of peptide and various concentrations of DPP-IV (0.1, 1, 5, 20, 50, 100, 150 and 200 mU/mL); (C) Dependence of the A630/A520 on the DPP-IV concentration. The final concentrations of AuNPs and peptide were 3.6 nM and 2 μM, respectively; (D) Inhibitory ratio of different concentrations of diprotin A (100, 200, 300, 400, 500, 600, 700, 800, 900 and 1000 μM) on the DPP-IV (50 mU/mL) activity.
