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: In this paper, five new xanthones, garcinenone A (1), B (3), C (4), D (7) and E (8), along with seven known compounds were isolated from the EtOAc-soluble extract of the bark of Garcinia xanthochymus, and their structures were elucidated by spectroscopic methods, especially 2D-NMR techniques.
Abstract: Five new xanthones, garcinenone A (1), B (3), C (4), D (7) and E (8), along with 7 known compounds were isolated from the EtOAc-soluble extract of the bark of Garcinia xanthochymus, and their structures were elucidated by spectroscopic methods, especially 2D-NMR techniques. Jacareubin (2), 1,4,6-trihydroxy-5-methoxy-7-(3-methyl-2-butenyl)xanthone (6), subeliptenone B (11) and symphoxanthone (12) were obtained from this plant for the first time. The isolated compounds exhibited potent antioxidant activity in the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging test with IC50 values in the 6.0–23.2 µmol/L. These results suggested that G. xanthochymus could be a promising rich source of natural antioxidant.
3 citations
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TL;DR: In this paper, the chemical constituents from the roots of polygala tricornis were identified by repeated silica gel chromatographies and their structures were determined by spectral analysis.
Abstract: Objective To study the chemical constituents from roots of Polygala tricornisMethods Compounds were isolated by repeated silica gel chromatographies and their structures were determined by spectral analysisResults Eight compounds were isolated from the roots of Ptricornis and their structures were identified as stigmasta-7,22-diene(Ⅰ),α-spinasterol(Ⅱ),α-spinasteryl-3-O-β-D-glucoside(Ⅲ),α-spinasteryl-3-O-β-D-glucoside-6′O-palmitate(Ⅳ),1,7-dihydroxy xanthone(Ⅴ),1,3-dihydroxy xanthone(Ⅵ),1-methoxy-2,3-methylenedioxy xanthone(Ⅶ),1,7-dimethoxy xanthone(Ⅷ)Conclusion Compounds Ⅰ-Ⅷ are obtained from this plant for the first time
3 citations
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01 Mar 1969TL;DR: In this article, the synthesis of 3, 5′-dimethyl- and 3, 4′ -dimethylfuraro (2′, 3′:1, 2)−6, 7-benzoxanthones (III and IV) is described.
Abstract: The Synthesis of 3, 5′-dimethyl- and 3,4′-dimethyl-furaro (2′, 3′:1, 2)−6, 7-benzoxanthones (III and IV) is described.
3 citations
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TL;DR: In this article, the content of xanthone and vitamin E from the crude nyamplung leaf was quantified through liquid-liquid extraction with methanol and petroleum ether to obtain two layers namely nonpolar fraction (PE fraction) and polar fraction (methanol fraction).
Abstract: Calophyllum inophyllum (nyamplung) has many advantages start from stems, leaves, roots, to seeds. Indonesian society generally only know that seeds can produce biodiesel. Nyamplung leaves have bioactive compounds, such as xanthone that can be used for medical purposed. Recently, quantification of xanthone and vitamin E in the nyamplung leaf still doesn’t exist. This research aims to isolate and quantify the content of xanthone and vitamin E from the crude nyamplung leaf. The separation is done through liquid-liquid extraction with methanol and petroleum ether (PE) to obtain two layers namely non-polar fraction (PE fraction) and polar fraction (methanol fraction). The mass ratio of solvent mixture-to-crude extract (10,30, 50 and 70) and the mass ratio of PE-to-methanol (1 and 3) were applied and analyzed by TLC, GC-MS, and UV-Vis. Xanthones (0.150 equilibrium constant, 15.16% purity and 94.43% recovery) were obtained in the methanol fraction based on the mass ratio of solvent mixture-to-crude extract of 70 and mass ratio of PE-to-methanol at 1.From GC-MS, Xanthones were detected in the methanol fraction with quality of 94% and Vitamin E was detected in the petroleum ether fraction with quality of 99%.
3 citations