Abstract: A 70% ethanol extract from azuki beans (Vigna angularis) was extracted further with CH2Cl2, EtOAc and n-BuOH to afford four fractions: CH2Cl2-soluble, EtOAc-soluble, n-BuOH-soluble and residual extract fractions. The EtOAc-soluble fractions showed the highest α-glucosidase inhibitory activity. Two pure flavonoid compounds, vitexin and isovitexin, were isolated (using the enzyme assay-guide fractionation method) from the EtOAc-soluble fractions. We further evaluated the interaction between the flavonoid compounds and α-glucosidase by fluorescence spectroscopy. Vitexin and isovitexin showed high inhibitory activities, with IC50 values of 0.4 mg·mL−1 and 4.8 mg·mL−1, respectively. This is the first study of the active compositions of azuki beans against α-glucosidase.
Keywords: azuki beans; α-glucosidase inhibitory; vitexin; isovitexin
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Yao, Y.; Cheng, X.; Wang, L.; Wang, S.; Ren, G. A Determination of Potential α-Glucosidase Inhibitors from Azuki Beans (Vigna angularis). Int. J. Mol. Sci. 2011, 12, 6445-6451.
Yao Y, Cheng X, Wang L, Wang S, Ren G. A Determination of Potential α-Glucosidase Inhibitors from Azuki Beans (Vigna angularis). International Journal of Molecular Sciences. 2011; 12(10):6445-6451.
Yao, Yang; Cheng, Xuzhen; Wang, Lixia; Wang, Suhua; Ren, Guixing. 2011. "A Determination of Potential α-Glucosidase Inhibitors from Azuki Beans (Vigna angularis)." Int. J. Mol. Sci. 12, no. 10: 6445-6451.