Journal
FITOTERAPIA
Volume 116, Issue -, Pages 17-23Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fitote.2016.11.005
Keywords
Flavan-3-ols; Flavonols; Enantiomers; Uncaria rhynchophylla; Antioxidant activity
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Funding
- National Scientific and Technological Major Project for Significant New Drugs Creation [2014ZX09304307-001]
- China Academy of Chinese Medical Sciences [12015032]
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Uncariols A (1) and B (2), two new phenylpropanoid-substituted flavan-3-ols, and (+/-)-uncariols C (3a/3b) and D (4a/4b), two pairs of new phenylpropanoid-substituted flavonol enantiomers, together with nine known compounds (5-13), were isolated from the leaves of Uncaria rhynchophylla. The structures of 1-4 were established primarily by NMR and HRESIMS experiments. The absolute configurations of the new ones were deduced via the circular dichroism (CD) and quantum chemical calculations of the electronic circular dichroic (ECD) spectra. In addition, all of the isolated compounds showed potent antioxidant activity in the DPPH radical scavenging test. (C) 2016 Published by Elsevier B.V.
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