Topic
Xanthone
About: Xanthone is a research topic. Over the lifetime, 1639 publications have been published within this topic receiving 25870 citations. The topic is also known as: 9-oxo-xanthene & Diphenyline ketone oxide.
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TL;DR: Five new metabolites, including the xanthone derivative wentixanthone A and the benzophenone wentiphenone A, were obtained from the fungus Aspergillus wentii, isolated from soil of the hypersaline lake El Hamra in Wadi El-Natrun, Egypt.
9 citations
Patent•
12 Jan 1972
9 citations
TL;DR: In this article, a new rotenoid, 6-ketodehydroamorphigenin from the stem-bark and 2-hydroxy-3-methoxyxanthone and its precursor 2,5-dihydroxy-4-mETHoxybenzophenone from the roots are reported.
9 citations
TL;DR: The structure determination of thiomelin (2,4-dichloro-1,8-dihydroxy-5-methoxy-6-methyl-9H-xanthen-9-one) is reported in this article, an unusual lichen metabolite probably derived biosynthetically by oxidative ring opening of a precursor anthraquinone.
Abstract: The structure determination of thiomelin (2,4-dichloro-1,8-dihydroxy-5-methoxy-6-methyl-9H-xanthen-9-one) (3), an unusual lichen metabolite probably derived biosynthetically by oxidative ring opening of a precursor anthraquinone, is reported. The crystal structure of thiomelin diacetate (4) was determined by X-ray diffraction, while that of the cogenors 8-O-methylthiomelin (5), 4-dechlorothiomelin (7), 4-dechloro-8- O- methylthiomelin (9), 2-dechloro-8- O- methylthiomelin (10) and 2,4-dichloro-l-hydroxy-7-methoxy-6,8-dimethyl-9H-xanthen-9-one (12) were deduced from spectroscopic data.
9 citations
TL;DR: In this article, xanthone compounds isolated from Swertia przewalskii pissjauk were well separated by capillary electrophoresis within 5 min, using a running buffer of 25 mM disodium tetraborate at pH 9.0.
Abstract: Pharmacologically active xanthone compounds isolated from Swertia przewalskii pissjauk were well separated by capillary electrophoresis (CE) within 5 min, using a running buffer of 25 mM disodium tetraborate at pH 9.0. Quantitative determination was shown to be possible because regression equations revealed a linear relationship between the peak area of each constituent and its concentration, with correlation coefficients of 0.9972-0.9994. The relative standard deviations were between 0.44%-0.73% for migration times and 2.52%-4.28% for peak areas. The dissociation constant of 1,7-O-beta-D-glucopyranosyl-8-hydroxy-3,7-dimethoxyxanthone, 1,8-dihydroxy-3, 7-dimethoxy-xanthone and 1,7-dihydroxy-3,8-dimethoxyxanthone were also measured by the CE method, giving a value of 9.04, 8.94, and 8.59, respectively.
8 citations