Archives of Pharmacal Research 2005-Sep
Antidiabetic stilbene and anthraquinone derivatives from Rheum undulatum.
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The antidiabetic-activity-guided fractionation and isolation of the 80% EtOH extracts obtained from cultivated Korean Rhubarb rhizomes (Rheum undulatum, Polygonaceae) led to the isolation and characterization of one stilbene, desoxyrhapontigenin (1) and two anthraquinones, emodin (2) and chrysophanol (3). Their structures were established by chemical and spectroscopic methods. Compounds 1, 2, and 3 inhibited postprandial hyperglycemia by 35.8, 29.5, 42.3%, respectively.