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Viburnum macrocephalum  f.  keteleeri , not well explored in the pharmaceutical field, is a tall deciduous shrub and commonly used as folk medicines for the treatment of type 2 diabetes (T2D). In this study, the dried branches of  V. macrocephalum  f.  keteleeri  were extracted with 95% ethanol and the extract was fractionated on the basis of polarity with ethyl acetate and  n -butanol. Among the different fractions, the ethyl acetate fraction exhibited the highest  α -glucosidase inhibitory activity, and its bioassay-guided fractionation led to the isolation and identification of six compounds including a new 8- O -4′-neolignan glycoside ( 1 ), categorized as a rare 7-deoxy skeleton, three previously undescribed phenolic glycosides ( 2–4 ), together with two known secondary metabolites ( 5 ,  6 ), which were found for the first time in  Viburnum . Noticeably, compound  1  had almost the same intestinal  α -glucosidase inhibitory activity as the positive control acarbose.

holzforschung

Isolation of neolignan and phenolic glycosides from the branches of  Viburnum macrocephalum  f.  keteleeri  and their  α -glucosidase inhibitory activity