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7 resultados
Cytochrome P450 Enzyme-Mediated Bioactivation as an Underlying Mechanism of Columbin-Induced Hepatotoxicity.
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Columbin, a furanoid compound, is the major bioactive ingredient of Tinospora sagittata (Oliv.) Gagnep, a traditional Chinese medicine that has been reported to cause liver injury in clinic. The aim of this study was to investigate the hepatotoxicity caused by columbin and the underlying mechanism.
Structure of columbin, a diterpenoid furanolactone from Tinospora cordifolia Miers.
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(1S,4R,5R,8S,10R,12S)-4-Hydroxy-15,16-epoxycleroda-2,12(16),14- trieno-17,12: 18,1-biscarbolactone, C20H22O6, Mr = 358.2, m.p. = 453-454 K, orthorhombic, P2(1)2(1)2(1), a = 7.3869 (6), b = 11.986 (1), c = 19.896 (2) A, V = 1761.65 A3, Z = 4, Dx = 1.351, Dm(by flotation) = 1.349 g cm-3, lambda(Cu K
Two New Clerodane Diterpenes from Tinospora sagittata.
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Two new clerodane-type diterpenes, tinosporins C (1) and tinosporins D (2) were isolated from the stems of Tinospora sagittata (Oliv.), together with three known ones, columbin (3), tinophylloloside (4), and tinospinoside D (5). The structures of these compounds were determined on the basis of
Tinospinosides D, E, and tinospin E, further clerodane diterpenoids from Tinospora sagittata.
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Chemical investigation on the roots of Tinospora sagittata resulted in the isolation of three novel cis-clerodane diterpenoids, tinospinosides D, E, and tinospin E, together with two known compounds, columbin and columbin glucoside, and their structures were determined by extensive spectroscopic
A novel 18-norclerodane diterpenoid from the roots of Tinospora sagittata var. yunnanensis.
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A novel 18-nor-clerodane diterpenoid named sagitone (1) was isolated from the 95% ethanol extract of dry roots of Tinospora sagittata var. yunnanensis together with the five known diterpenoids columbin (2), palmatoside C (3), fibleucin (4), tinophylloloside (5) and epitinophylloloside (6). The
A new antifeedant clerodane diterpenoid from Tinospora cordifolia.
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Phytochemical investigation of the chloroform extract of Tinospora cordifolia yielded a new clerodane diterpenoid tincordin along with tinosporide, 8-hydroxytinosporide, columbin, 8-hydroxycolumbin and 10-hydroxycolumbin. The structure of the new compound was elucidated comprehensively using 1D and
Quantitative determination of four constituents of Tinospora sps. by a reversed-phase HPLC-UV-DAD method. Broad-based studies revealing variation in content of four secondary metabolites in the plant from different eco-geographical regions of India.
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This paper describes the separation and quantitation of important markers, such as 20beta-hydroxyecdysone, tinosporaside, cordioside, and columbin, present in three species of Tinospora viz, T. cordifolia, T. malabrica, and T. crispa. A reverse-phase (RP) high-performance liquid chromatography
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