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. 2014 Aug 4;19(8):11453-64.
doi: 10.3390/molecules190811453.

An unusual piceatannol dimer from Rheum austral D. Don with antioxidant activity

Lin Hu  1 , Na-Na Chen  2 , Qun Hu  3 , Cui Yang  4 , Qing-Song Yang  5 , Fang-Fang Wang  6
Affiliations

An unusual piceatannol dimer from Rheum austral D. Don with antioxidant activity

Lin Hu et al. Molecules. .

Abstract

A novel dimer of piceatannol glycoside, named rheumaustralin (1) was isolated from the underground parts of the ethnomedicinal plant Rheum austral (Polygonaceae) collected from Tibet together with 17 known compounds, including rheumin (2), 2,5-dimethyl-7-hydroxychromone (3), 2,5-dimethylchromone-7-O-β-D-glucopyranoside (4), 7-hydroxy-2-(2'-hydroxypropyl)-5-methylchromone (5), torachrysone (6) torachrysone-8-O-β-D-glucopyranoside (7), 4-(4'-hydroxyphenyl)-2-butanone-4'-O-β-D-glucopyranoside (8), amabiloside (9), N-trans-feruloyl tyramine (10), chrysophanol (11), aloe-emodin (12), emodin (13), physcion (14), physcion-1-O-β-D-glucopyranoside (15), emodin-8-O-β-D-glucopyranoside (16), D-catechin (17) and gallic acid (18). Their structures were determined by combined spectroscopic methods and by comparison of their spectral data with those reported in literature. Compounds 1-10 were tested for their ability to scavenge 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Chemical structures of compounds 1–18.
Figure 2
Figure 2
Main HMBC (indicated by blue arrows from 1H to 13C) of compound 1.
See this image and copyright information in PMC

References

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