Xanthine oxidase inhibitors from Brandisia hancei
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AbstractXanthine oxidase is a key enzyme associated with the incidence of hyperuricemia-related disorders. Repeated chromatography of the enzyme inhibitory part of the water extract of the twigs and leaves of Brandisia hancei (Scrophulariaceae) gave a flavone luteolin, an iridoid glycoside mussaenoside, two beta-sitosterol glycosides daucosterol and beta-sitosterol gentiobioside, and five phenylethanoids arenarioside, brandioside, acteoside, 2'-O-acetylacteoside and isoacteoside. Luteolin and isoacteoside inhibited the xanthine oxidase (XO, EC 1.2.3.2) with the IC50 values at 7.83 and 45.48 mu M, respectively. Isoacteoside was found to be the first phenylethanoid that decreased substantially the formation of uric acid by inhibiting competitively xanthine oxidase (K-i value: 10.08 mu M). Furthermore, the study suggested that the caffeoylation of the 6'-hydroxyl group of the phenylethanoids was essential for the enzyme inhibitory action.
All Author(s) ListKong LD, Wolfender JL, Cheng CHK, Hostettmann K, Tan RX
Journal namePlanta Medica
Year1999
Month12
Day1
Volume Number65
Issue Number8
PublisherGEORG THIEME VERLAG
ISSN0032-0943
eISSN1439-0221
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesChemistry, Medicinal; CHEMISTRY, MEDICINAL; Pharmacology & Pharmacy; PHARMACOLOGY & PHARMACY; Plant Sciences; PLANT SCIENCES

Last updated on 2020-17-01 at 02:22