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  • Title: Antioxidant flavonoids from the rhizomes of Helminthostachys zeylanica.
    Author: Huang YL, Yeh PY, Shen CC, Chen CC.
    Journal: Phytochemistry; 2003 Dec; 64(7):1277-83. PubMed ID: 14599526.
    Abstract:
    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 +/- 0.32, 7.23 +/- 0.22, and 7.93 +/- 0.31, respectively.
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