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Molecules 2014, 19(8), 11453-11464;

An Unusual Piceatannol Dimer from Rheum austral D. Don with Antioxidant Activity

Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650031, China
Kunming Xianghao Technology Co., Ltd., Kunming 650204, China
Author to whom correspondence should be addressed.
Received: 16 May 2014 / Revised: 4 July 2014 / Accepted: 21 July 2014 / Published: 4 August 2014
(This article belongs to the Section Natural Products Chemistry)
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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 110 were tested for their ability to scavenge 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical. View Full-Text
Keywords: Rheum austral D. Don; piceatannol dimer; rheumaustralin; DPPH radical Rheum austral D. Don; piceatannol dimer; rheumaustralin; DPPH radical

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Hu, L.; Chen, N.-N.; Hu, Q.; Yang, C.; Yang, Q.-S.; Wang, F.-F. An Unusual Piceatannol Dimer from Rheum austral D. Don with Antioxidant Activity. Molecules 2014, 19, 11453-11464.

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