Figure 3: Dose response of norathyriol, mangiferin, and acarbose on inhibition for α-glucosidase. In the assay of dose response, norathyriol concentrations were from 0.0002 mM to 0.0167 mM, mangiferin concentrations were 0.0130–1.667 mM, and acarbose concentrations were 0.3125–10 mM. The inhibitory activity of α-glucosidase was evaluated at different concentrations of norathyriol (0.0002–0.0167 mM), mangiferin (0.0130–1.667 mM), and acarbose (0.3125–10 mM). In this assay, the catalytic activity of α-glucosidase of vehicle was served as 0% inhibitory rate.