[Chemical constituents of Viburnum utile and their inhibitory activities against α-glucosidase].

The chemical constituents in the ethanol extract of Viburnum utile were isolated by column chromatography with D101 macroporous resin, silica gel, and Sephadex LH-20. Their structures were identified by spectroscopic techniques such as NMR and MS. All the compounds were evaluated for the inhibitory activities against α-glucosidase. Sixteen compounds were obtained and identified as viburnumide A(1), vitamin E(2), α-amyrin(3), α-tocoquinone(4), narjatamanin B(5), ethyl caffeate(6), naringenin(7), apigenin(8), ethyl β-D-ribo-hex-3-ulopyranoside(9), trans-p-hydroxycinnamic acid(10), amentoflavone(11), apigenin-7-O-β-D-glucoside(12), luteolin-7-O-β-D-glucoside(13), henryoside(14), ursolic acid(15), and 2α-hydroxy-oleanolic acid(16). Among them, compound 1 was a new compound, and compounds 2-16 were isolated from V. utile for the first time. The inhibitory activity(IC_(50) of 4.0 μmol·L~(-1)) of compound 11 against α-glucosidase was comparable to that of the positive control acarbose(IC_(50) of 2.3 μmol·L~(-1)).