Journal
PHYTOCHEMISTRY
Volume 64, Issue 7, Pages 1277-1283Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2003.09.009
Keywords
Helminthostachys zeylanica; ophioglossaceae; flavonoid; ugonins E-L; antioxidants; DPPH
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Eight flavonoids, ugonins E-L (1-8), were isolated from the rhizomes of Helminthostachys zeylanica, and their structures were established on the basis of spectral evidence. Compounds 3-8 were evaluated for their antioxidative activity in the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay. Compounds 6, 7 and 8 were more active than Trolox, with IC20 values of 5.29 +/- 10.32, 7.23 +/- 0.22, and 7.93 +/- 0.31, respectively. (C) 2003 Elsevier Ltd. All rights reserved.
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