Journal
TETRAHEDRON LETTERS
Volume 50, Issue 42, Pages 5864-5867Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2009.08.014
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Funding
- Thailand Research Fund [MRG5180158]
- Chulalongkorn University [F-31-GS-ES13/28]
- TRF Master Research Grant [MRGW11505SO05]
- Thailand Toray Science Foundation (TTSF)
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Corchorus olitorius, a highly fibrous vegetable commonly known as moroheiya, has long been recognized for its hypoglycemic activity. Bioassay-guided fractionation of the leaf extract led to the isolation of two new flavonol glycosides named corchorusides A and 13, in addition to a major component, capsugenin-25,30-O-beta-diglucopyranoside. Corchoruside A comprises a kaempferol moiety connected with caffeic acid, glucose, and a rare methyl glucuronate (MeGlcA). The occurrence of a caffeoyl moiety in corchoruside A enhanced significantly its inhibitory effect toward alpha-glucosidase compared to that in corchoruside B. (C) 2009 Elsevier Ltd. All rights reserved.
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