The inhibitory effect of the RGPE oral intake on postprandial hyperglycemia in STZ-induced diabetic mice after starch challenge. The fasted STZ-induced diabetic mice were administered with 100 μL of either vehicle or RGPE solution (400 mg/kg, bw) by gavage. After approximately 15 min, 100 μL of potato starch solution (2 g/kg, bw) was administered and blood was collected from tail vein at 0, 30, 60, and 120 min to determine blood glucose levels. A. The glycemic response curve in diabetic mice after starch challenge. B. The incremental AUC0-120 min in diabetic mice after starch administration. *, P < 0.05 vs. control (n = 8).