• YAKHAK HOEJI
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• v.43 no.2
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• pp.233-236
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• 1999

In order to clarify the anti-Ohyul activity of rhubarb, we investigated the effects of water extract from rhizomes of four different rhubarb on blood platelet aggregation induced by arachidonic acid, ADP, collagen and PAF in vitro. The cultivated Korean rhubarb rhizomes (Rheum undulatum) exhibited the most potent inhibitory action on the aggregation induced by arachidonic acid and also among the four fractions, stilbene components containing part showed strong inhibitory action. These inhibitory effect may partially contributed to anti-Ohyul activity of rhubarb.

• Archives of Pharmacal Research
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• v.22 no.4
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• pp.401-403
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• 1999

In continued studies on cultivated Korean rhubarb rhizomes (Rheum undulatum), three known stillbenes (desoxyrhapontigenin, rhapontigenin, piceatannol) have been screened for activity on blood platelet aggregation. Both rhapontigenin and desoxyrhapontigenin exhibited strong inhibition on the aggregation induced by arachidonic acid collagen. However, piceatannol did not show inhibition. These inhibitory effects may partially contribute to anti-blood stagnancy activity of rhubarb.

• Archives of Pharmacal Research
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• v.23 no.2
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• pp.159-162
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• 2000

A new stilbene diglycoside, piceatannol-3, 4'-O-$\beta$-D-diglucopyranoside (I), together with desoxyrhaponticin (II), emodin-1-O-$\beta$-D-glucopyranoside (III), and physcion-8-O-b-D-gluco-pyranoside (IV), were isolated from the rhizomes of cultivated Korean rhubarb rhizomes(Rheum undulatum), Jong DaeWhang, and the structures of 1-IV were identified on the basis of chemical and spectral evidences.

• YAKHAK HOEJI
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• v.42 no.1
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• pp.1-4
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• 1998

In continued studies on cultivated Korean rhubarb rhizomes, three additional stilbene compounds were isolated from water extract by column chromatographic separation using Sepha dex LH-20, ODS-gel. Compound I, desoxyrhapontigenin(3,5-dihydroxy-4`-methoxystilbene), Compound II, rhapontigenin(3,3`,5-trihydroxy-4`-methoxystilbene), and compound III, piceatannol(3,3`,4`,5-tetrahydroxystilbene) were elucidated based on physico-chemical and spectroscopic evidences(UV, IR, $^1H$-NMR, $^13C$-NMR and Mass).

• Archives of Pharmacal Research
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• v.18 no.4
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• pp.282-288
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• 1995

The sutdies were carried out to evaluate the consituents in the rihzomes of the cultivated Korean Rhubarb (Polygonaceae). From the acetone fraction ofl methanol extract Compound I (1, 8-dihydroxy-3-methyl anthraquinone, chrysophanic acid), Compound II($chrysophanol-8-O-{\beta}-D-glucopyranoside$), Compound III ($emodin-8-O-{\beta}-D-glucopyranoside$) and Compound IV ($aloe-emodin-8-O-{\beta}-D-glucopyranoside$), and from the ether fraction Compound V(1, 8-dihydorxy-3-emthyl-6-methoxy anthraquinone, physcion) and Compound VI (1, 6, 8-thitydroxy-3-emthyl anthrauinone, emodin), and also from the n-buthanol fraction Compound VII ($rhapontigenin-3-O-{\beta}-D-glucopyranoside, rhaponticin$) and Compound VIII ($piceatannol-3'-O-{\beta}-D-glucopyranoside$), were isolated and identified on the basis of their physico-chemical and spectroscopic evidences (UV, IR, H-NMR, C-NMR, EI-MS), respectively.

• Korean Journal of Pharmacognosy
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• v.31 no.2
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• pp.245-248
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• 2000

As a series of the studies on cultivated Korean rhubarb rhizomes (Rheum undulatum), five stilbene derivatives were screened for inhibitory activity against $5{\alpha}-reductase$. Of these, desoxyrhapontigenin, rhapontigenin, and piceatannol exhibited inhibition, whereas, two other stilbene glycosides, rhaponticin and $piceatannol-3'-O-{\beta}-D-glucopyranoside$ did not show the inhibition.

• Archives of Pharmacal Research
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• v.28 no.9
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• pp.1027-1030
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• 2005

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.