Abstract: The use of α-glucosidase inhibitors is considered to be an effective strategy in the treatment of diabetes. Using a bioassay-guided fractionation technique, five Bacillus stearothermophilus α-glucosidase inhibitors were isolated from the flowers of Musa spp. (Baxijiao). Using NMR spectroscopy analysis they were identified as vanillic acid (1), ferulic acid (2), β-sitosterol (3), daucosterol (4) and 9-(4′-hydroxyphenyl)-2-methoxyphenalen-1-one (5). The half maximal inhibitory concentration (IC50) values of compounds 1–5 were 2004.58, 1258.35, 283.67, 247.35 and 3.86 mg/L, respectively. Compared to a known α-glucosidase inhibitor (acarbose, IC50 = 999.31 mg/L), compounds 3, 4 and 5 showed a strong α-glucosidase inhibitory effect. A Lineweaver-Burk plot indicated that compound 5 is a mixed-competitive inhibitor, while compounds 3 and 4 are competitive inhibitors. The inhibition constants (Ki) of compounds 3, 4 and 5 were 20.09, 2.34 and 4.40 mg/L, respectively. Taken together, these data show that the compounds 3, 4 and 5 are potent α-glucosidase inhibitors.
Keywords: α-glucosidase; inhibitor; hyperglycemia; flowers of Musa spp. (Baxijiao)
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Sheng, Z.; Dai, H.; Pan, S.; Wang, H.; Hu, Y.; Ma, W. Isolation and Characterization of an α-Glucosidase Inhibitor from Musa spp. (Baxijiao) Flowers. Molecules 2014, 19, 10563-10573.
Sheng Z, Dai H, Pan S, Wang H, Hu Y, Ma W. Isolation and Characterization of an α-Glucosidase Inhibitor from Musa spp. (Baxijiao) Flowers. Molecules. 2014; 19(7):10563-10573.
Sheng, Zhanwu; Dai, Haofu; Pan, Siyi; Wang, Hui; Hu, Yingying; Ma, Weihong. 2014. "Isolation and Characterization of an α-Glucosidase Inhibitor from Musa spp. (Baxijiao) Flowers." Molecules 19, no. 7: 10563-10573.