from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A crystalline compound, C15H10O2, the parent substance of a number of important yellow pigments, occurring on the leaves or in the stems and seed capsules of many primroses.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. any of a class of tricyclic aromatic heterocyclic ketones, especially the naturally occurring flavonoids
- n. (uncountable) the parent compound of this class
from The Century Dictionary and Cyclopedia
- n. A group of naturally occurring yellow coloring-matters, some members of which are used as dyes. The parent substance is called phenylpheno-
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a colorless crystalline compound that is part of a number of white or yellow plant pigments
Sorry, no etymologies found.
The usual dose is 60 mg twice a day, and it should be standardized to 24 percent flavone glycosides or ginkgolides.
Polyphenols identified in the cocoa bean include several different catechins, as well as procyanins, anthocyanins, and flavone and flavonol glycosides.
Willstätter has elucidated the chemical structure of these cyanidins; he has proved in what their difference consists in the various flowers or fruits, and has also proved their close relationship with the yellow pigments, occurring in Nature, of the flavone or flavonol group.
JAIN, R.K. and SHARMA, G.C. (1980) ProsogerinD, a new flavone from Prosopis spicigera seeds.
BATYUK, V.S. and KOLTSOVA, L.F. (1968) Isoquercitrin, a new flavone glycoside of Solidago canadensis.
V. (1963) A new flavone from Artemisia herba-alba.
Active ingredients include flavone glycosides (including ginkgolide), bioflavins, sitosterol, lactones and anthocyanin.
The flavonoids, apigenin, flavone, flavanone, hesperidin, naringin, and tangeretin promoted the ascorbic acid-induced lipid peroxidation, the extent of which depended upon the concentration of the flavonoid and ascorbic acid.
The presence of a double bond at position C-2-3 in the flavone and flavonol aglycones, a keto group at C-4, B ring hydroxylation and/or a free hydroxyl group at C-3 may be associated with activity.
Among the 22 flavone derivatives tested, only wogonin was strongly mutagenic, while five derivatives, apigenin triacetate, acacetin, chrysoeriol, pedalitin, and pedalitin tetraacetate, were only weakly mutagenic.