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: A recent review as mentioned in this paper summarizes the isolation, structural elucidation and biological activities and more importantly, the recent strategies for the microbial biosynthesis and chemical synthesis of polycyclic xanthone natural products (BPXNPs).
3 citations
3 citations
01 Jan 2005
TL;DR: In this article, seven compounds were isolated from Swertia bifolia Batal and their structures were identified by spectral method as 1-hydroxy-3,5-dimethoxyxanthone (Ⅰ), 1-lydroxy -3,7,8-trimethoxy xanthone(Ⅱ), 1,8 -dihydroxy- 3,5 -dimethylhexanthone, 1,7-dihdioxanthone and β-sitosterol (β-daucosterol), β-
Abstract: Seven compounds were isolated from Swertia bifolia Batal.Their structures are identified by spectral method as 1-hydroxy-3,5-dimethoxyxanthone (Ⅰ),1-lydroxy-3,7,8-trimethoxy xanthone (Ⅱ),1,8-dihydroxy-3,5-dimethoxyxanthone(Ⅲ),1,8-dihydroxy-3,7-dimethoxyxanthone(Ⅳ),1,7-dihydroxy-3,8-dimethoxyxanthone(Ⅴ),β-sitosterol(Ⅵ) and β-daucosterol(Ⅶ).
3 citations
TL;DR: Chlorogenic acid and CA inhibited radical formation through several different mechanisms: the complex formation of CA with iron ions in the reactions of hydrogen peroxide with ferrous ion, hydrogen perox with ferric ion and 3-HAT, 13-HPODE with ferous ion, in the reaction mixture of rat liver microsomes with FeCl 3 and ADP, rat livermicrosome with ethanol.
Abstract: Chlorogenic acids and their derivatives, which are esters of caffeic acid (CA) with quinic acid, occur in coffee beans. Caffeic acid is also present in coffee at a concentration of approximately 250 mg per cup. The effects of CA and chlorogenic acid on the formation of radicals were examined in several reactions, such as the reaction of hydrogen peroxide with ferrous ion, the reaction of hydrogen peroxide with ferric ion and 3-hydroxyanthranilic acid (3-HAT), the reaction of 13-hydroperoxide octadecadienoic acid (13-HPODE) with ferrous ion (or cytochrome c ), the reaction of rat liver microsomes with FeCl 3 and ADP, the reaction of rat liver microsomes with ethanol, and the reaction of xanthone under irradiation with 13 J/cm 2 UVA light. Chlorogenic acid and CA inhibited radical formation through several different mechanisms: the complex formation of CA with iron ions in the reactions of hydrogen peroxide with ferrous ion, hydrogen peroxide with ferric ion and 3-HAT, 13-HPODE with ferrous ion, in the reaction mixture of rat liver microsomes with FeCl 3 and ADP, rat liver microsomes with ethanol; the reduction of cytochrome c in the reaction of 13-HPODE with cytochrome c; and the quenching of excited xanthone in the reaction of xanthone under irradiation with 13 J/cm 2 UVA light.
3 citations
TL;DR: The phytochemical investigation of the flower and twig extracts of Garcinia mckeaniana yielded a new xanthone, mckeanianone F and a new biphenyl,mckeaniabiphenyl together with 15 known compounds.
3 citations