Results 141 to 150 of about 4,599 (180)

Metabolism of Xanthone in the Rat

Xenobiotica, 1974
Abstract1. The metabolism of xanthone by the rat has been investigated.2. The major unconjugated urinary metabolite was 4-hydroxyxanthone (24%). Smaller amounts of free 2-hydroxyxanthone (13%) and 3-hydroxy-xanthone (6%) were also formed. Other fluorescent metabolites were detected in trace amounts.3.
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Xanthones from Swertia punctata

Phytochemistry, 2002
Isolation of 1-O-primeverosyl-3,8-dihydroxy-5-methoxyxanthone and 1-O-gentiobiosyl-3,7-dimethoxy-8-hydroxyxanthone, along with five known xanthones, isobellidifolin, methylbellidifolin, isoswertianin, methylswertianin and norswertianin-1-O-beta-D-glucoside, from the roots of Swertia punctata is reported. In the aerial parts four xanthones, bellidifolin,
Menkovic, N, Savikin-Fodulovic, K, Bulatović, V., Aljančić, Ivana, Juranic, N, Macura, S, Vajs, Vlatka, Milosavljević, Slobodan   +7 more
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Microwave‐Assisted Xanthone Synthesis

Synthetic Communications, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
E. A. Evangelista, M. R. C. Couri, R. B. Alves, D. S. Raslan, R. P. F. Gil   +4 more
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A xanthone from Shultesia guianensis

Fitoterapia, 2001
The isolation of 1-hydroxy-3,7-dimethoxyxanthone (1) from Shultesia guianensis is reported along with relevant NMR spectra, including new data by two-dimensional NMR experiments (HMQC and HMBC).
F J, Monte, F P, Soares, R, Braz-Filho
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Xanthones from Hypericum chinense

Phytochemistry, 2006
Six xanthones, 1,3,7-trihydroxy-2-(2-hydroxy-3-methyl-3-butenyl)-xanthone (1), 1,7-dihydroxy-2,3-[2''-(1-hydroxy-1-methylethyl)-dihydrofurano]-xanthone (2), 1,3,7-trihydroxy-5-methoxyxanthone (3), 1,7-dihydroxy-5,6-dimethoxyxanthone (4), 4,5-dihydroxy-2,3-dimethoxyxanthone (5), 1,3-dihydroxy-2,4-dimethoxyxanthone (6) and 21 known xanthones were ...
Naonobu, Tanaka, Yoshihisa, Takaishi
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Xanthones from Hypericum roeperanum

Phytochemistry, 1996
Four new xanthones have been isolated from the roots of Hypericum roeperanum. Their structures have been established by a combination of spectroscopic and chemical methods as 1,6-dihydroxy-5-methoxy-4',5'-dihydro-4',4',5'-trimethylfurano- (2',3':3,4)-xanthone (5-O-methyl-2-deprenylrheediaxanthone B), 1,6-dihydroxy-5-methoxy-6',6'-dimethylpyrano-(2',3 ...
Rath G, Potterat O, Mavi S, Hostettmann K   +3 more
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Xanthones ofGarcinia cowa

Planta Medica, 1994
Five xanthones have been isolated from Garcinia cowa Roxb. (Guttiferae): cowanin (1), cowanol (2), cowaxanthone (3), 1,3,6-trihydroxy-7-methoxy- 2-5-bis(3-methyl-2-butenyl)xanthone (4), and norcowanin (5). The structures were assigned by spectroscopic studies. Xanthones 2 and 3 showed moderate antimicrobial activity against Staphylococcus aureus.
P, na Pattalung, W, Thongtheeraparp, P, Wiriyachitra, W C, Taylor   +3 more
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The binding of xanthone derivatives to transthyretin

Biochemical Pharmacology, 2005
A series of xanthone derivatives, isolated from Calophyllum teysmannii var. inophylloide, have been evaluated for their binding affinity to transthyretin. Transthyretin is a plasma protein involved in the transport of thyroxine (T4) and also implicated in amyloid diseases.
Filipe, Maia, Maria do Rosário, Almeida, Luís, Gales, Anake, Kijjoa, Madalena M M, Pinto, Maria J, Saraiva, Ana M, Damas   +6 more
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Sulfonated Xanthones from Hypericum sampsonii.

ChemInform, 2004
Xanthones, 1,3-dihydroxy-5-methoxyxanthone-4-sulfonate and 1,3-dihydroxy-5-O-beta-D-glycopyranosylxanthone-4-sulfonate, together with nine known compounds were obtained from H. sampsonii. This is the first report of sulfonated xanthonoids. Furthermore, compounds 1 and 2 exhibited significant cytotoxicity against the P388 cancer cell line.
Di, Hong, Feng, Yin, Li-Hong, Hu, Ping, Lu   +3 more
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Xanthones as systematic markers

Biochemical Systematics and Ecology, 1973
Abstract An evolutionary scheme for shikimate-acetate derived xanthones is deduced from their substitution pattern. Increasing distance of a particular xanthone from the primitive precursor is symbolized by increasing numbers. Each xanthone containing plant species is characterized by the average of the numbers attributed to its constituents.
Ceres Maria Andrade da Mata Rezende, Otto Richard Gottlieb   +1 more
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