Journal
NATURAL PRODUCT RESEARCH
Volume 20, Issue 10, Pages 927-934Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786410500378494
Keywords
Calliandra haematocephala; Fabaceae; leaves and stem; galloylated flavonol rhamnosides; ESI-MS; antioxidant activity
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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-beta-D-C-4(1)-glucopyranoside ( 9), afzelin ( 10), isoquercitrin ( 11), myricetin 3-O-(6 ''-O-galloyl)-beta-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-beta-D-C-4(1)-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.
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