Pelargonidin-3- O -rutinoside as a novel α-glucosidase inhibitor for improving postprandial hyperglycemia

A novel strategy for the isolation of anthocyanins was developed by a combination of high-speed countercurrent chromatography (HSCCC) and HPLC techniques. Using this strategy, a novel α-glucosidase inhibitor (pelargonidin-3-O-rutinoside, a natural anthocyanin) was isolated from strawberries. Structural determinants for inhibition of α-glucosidase by Pg3R and the SAR of natural anthocyanins were revealed in detail by enzymatic kinetics and molecular docking analysis.