Results 201 to 210 of about 53,910 (244)

Manganese and iron flavonolates as flavonol 2,4-dioxygenase mimics

Chemical Communications, 2007
Mononuclear manganese(II) and iron(III) flavonolates were synthesized as synthetic enzyme-substrate complexes, and their oxygenation reactions as biomimetic functional models with relevance to flavonol 2,4-dioxygenases are briefly described.
Kaizer, József, Baráth, Gábor, Pap, József, Speier, Gábor, Giorgi, Michel, Réglier, M.   +5 more
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Flavonols from Bauhinia malabarica

Journal of Natural Medicines, 2008
Bauhinia malabarica Roxb. has been used in Thai traditional medicine for wound healing, as a diuretic, to fight dysentery and as an emmenagogue. Seven flavonols, including 6,8-di-C-methylkaempferol 3-methyl ether, kaempferol, afzelin, quercetin, isoquercitrin, quercitrin, and hyperoside were isolated from the methanol extract of leaves.
Rawiwun, Kaewamatawong, Mariko, Kitajima, Noriyuki, Kogure, Hiromitsu, Takayama   +3 more
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Flavonols and cardiovascular disease

Molecular Aspects of Medicine, 2010
Flavonols, and specially quercetin, are widely distributed in plants and are present in considerable amounts in fruits and vegetables. In addition to their anti-oxidant effect, flavonols interfere with a large number of biochemical signaling pathways and, therefore, physiological and pathological processes.
Francisco, Perez-Vizcaino, Juan, Duarte
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Flavonols: Direct new synthesis of 6-hydroxy-flavonols

Proceedings of the Indian Academy of Sciences - Section A, 1950
The synthesis of 6-hydroxy-flavonols has been effected by the Algar and Flynn oxidation of 2∶5-dihydroxy-, 2∶5∶2′-trihydroxy-, 2∶5∶4′-trihydroxy-chalkones and 6∶3′-dihydroxy- and 6∶4′-dimethoxy-flavanones by means of alkaline hydrogen peroxide. The flavonols obtained have been characterised by preparing their acetyl or methoxy derivatives.
G. N. Vyas, N. M. Shah
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Flavonol glycosides fromMonnina sylvatica

Phytochemistry, 1991
A new kaempferol triglycoside and three known kaempferol glycosides, among them two apiosides, have been isolated from the aerial parts of Monnina sylvatica. The structures were established on the basis of acid and enzymatic hydrolysis and spectral data (UV, 1H and 13CNMR, NOE difference measurements, D/CI and FAB-MS) of the isolates and of some ...
A, Bashir, M, Hamburger, M P, Gupta, P N, Solis, K, Hostettmann   +4 more
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Flavonol glycosides from Eupatorium tinifolium

Phytochemistry, 1990
Abstract Two new flavonol glycosides, 3′-methylquercetagetin 3-O-galactoside and 3′-methylquercetagetin 3-O-glucoside, have been isolated from the ethyl acetate extract of Eupatorium tinifolium. The structure of these compounds has been established on the basis of chemical and spectral data.
M. DAGOSTINO, F. DESIMONE, A. DINI, E. RAMUNDO, ZOLLO, FRANCO   +4 more
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Flavonol glycosides from Dasymaschalon sootepense

Phytochemistry, 1998
Two novel flavonol glycosides have been isolated from a methanolic extract of Dasymaschalon sootepense leaves. They are the 3'-neohesperidoside and 3'(6G-alpha-rhamnosylneohesperidoside) of quercetin 3,7-dimethyl ether.
A, Sinz, R, Matusch, T, Santisuk, S, Chaichana, V, Reutrakul   +4 more
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Flavonol Glycosides from Dryas octopetala

Journal of Natural Products, 1984
Six flavonol glycosides and ent-epicatechin were isolated from Dryas octopetala and their structures elucidated by chemical and spectroscopic methods. Two new flavonoids, 3-O-alpha-L-arabinofuranosyl-8-methoxyquercetin (2) and 3-O-beta-galactopyranosyl-8-methoxykaempferol (6), were identified along with 3-O-beta-D-galactopyranosylquercetin (hyperin) (3)
SERVETTAZ O. ., COLOMBO, Maria Laura, DEBERNARDI M., UBERTI E., VIDARI G., VITAFINZI P.   +5 more
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Flavonols drive plant microevolution

Nature Genetics, 2016
The idea that pollinators are in large part responsible for the diversity of flowering plants dates back more than 150 years to Darwin's work, but even modern scientists have struggled to identify specific 'speciation genes' and determine how they influenced flower-pollinator interactions.
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