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  • Title: Comparison of inhibitory activities and mechanisms of five mulberry plant bioactive components against α-glucosidase.
    Author: He H, Lu YH.
    Journal: J Agric Food Chem; 2013 Aug 28; 61(34):8110-9. PubMed ID: 23909841.
    Abstract:
    The α-glucosidase inhibitory effects of five bioactive components, namely 1-deoxynojirimycin, cyanidin-3-glucoside, cyanidin-3-rutinoside, resveratrol and oxyresveratrol contained in mulberry (Morus, Moraceae) plants have been compared. Spectroscopy methods were employed to compare their α-glucosidase inhibitory mechanisms. The results revealed that 1-deoxynojirimycin (competitive), resveratrol and oxyresveratrol (noncompetitive) were stronger inhibitors than acarbose, while cyanidin-3-glucoside and cyanidin-3-rutinoside (mix competitive and noncompetitive) showed modest activities. 1-Deoxynojirimycin, resveratrol and oxyresveratrol could quench the fluorescence spectra statically by forming stable complexes, while the quenching of cyanidin-3-rutinoside and cyanidin-3-glucoside belonged to dynamic quenching by the collision of molecules. The interactions between ligands and α-glucosidase were mainly driven by hydrophobic force, or hydrogen bonding consequently induced conformational changes and reduced surface hydrophobicity. Docking results suggested that they could bind to α-glucosidase at different sites. This work provides useful information for the understanding of the ligands-α-glucosidase interactions and identifies oxyresveratrol as a potent α-glucosidase inhibitor.
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