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Natural Product Research
Formerly Natural Product Letters
Volume 20, 2006 - Issue 10
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Original Articles

Antioxidant galloylated flavonol glycosides from Calliandra haematocephala

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Pages 927-934 | Received 12 Jul 2005, Accepted 20 Sep 2005, Published online: 21 Aug 2006
 

Abstract

Three new acylated quercetin rhamnosides have been isolated from the leaves and stem of Calliandra haematocephala Hassk. (Fabaceae) and their structures were established as quercitrin 2′′-O-caffeate (1), quercitrin 3′′-O-gallate (2) and quercitrin 2′′,3′′-di-O-gallate (3). Also, 17 known compounds were identified as gallic acid (4), methyl gallate (5), caffeic acid (6), myricitrin (7), quercitrin (8), myricetin 3-O-β-D-4C1-glucopyranoside (9), afzelin (10), isoquercitrin (11), myricetin 3-O-(6′′-O-galloyl)-β-D-glucopyranoside (12), myricitrin 2′′-O-gallate (13), quercitrin 2′′-O-gallate (14), afzelin 2′′-O-gallate (15), myricitrin 3′′-O-gallate (16), afzelin 3′′-O-gallate (17), 1,2,3,4,6-penta-O-galloyl-β-D-4C1-glucopyranose (18), myricitrin 2′′,3′′-di-O-gallate (19), quercetin 3-O-methyl ether (20), for the first time from the genus Calliandra except for 6. Compounds 7, 8, 13, 14, 16 and 19 exhibited moderate to strong radical scavenging properties on lipid peroxidation, hydroxyl radical, superoxide anion generation and DPPH radical in comparison with that of quercetin as a positive control in vitro. Compounds 7 and 8 exhibited lethal effect towards brine shrimp Artemia salina.

Acknowledgement

This study was supported by the Robert A. Welch Foundation (Grant F-130) to T.J.M. at the University of Texas at Austin, USA.

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