flavan

flavan

[′fla·vən]
(biochemistry)
C15H14O 2-Phenylbenzopyran, an aromatic heterocyclic compound from which all flavonoids are derived.
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En ese sentido, los taninos, polimeros formados por condensacion de monomeros flavan-3 ol y/o flavan 3,4-diol por una sucesiva polimerizacion, originan productos amorfos como flobafenos y antocianidinas, que pueden formar complejos insolubles con las proteinas reduciendo su utilizacion digestiva (23); este es uno de los mecanismos propuestos en la disminucion o inactivacion de las enzimas digestivas.
The above [sup.1]H-NMR pattern suggests that the compound has flavan skeleton with two aromatic protons (H-6 and 8) on ring A and three aromatic protons (H-2', 5', and 6') on ring B and devoid of the carbonyl group at C-4 of ring C.
The basic flavonoid structure is the flavan nucleus consisting of a 15-carbon skeleton arranged in two phenyl rings bound by a three-carbon bridge commonly encircled by oxygen, then forming three rings (Figure 1) [56].
(136) Rutgers proclaims, "Scientists have developed a proprietary method of extracting and purifying a novel type of piperidine flavan alkaloids from the leaves of Combretum micranthum (kinkeliba) and a procedure for the preparation of total piperidine flavan alkaloids (TPFA) that possess anti-diabetic properties." (137) Paralleling that of the previous two case studies, it does not appear that a specific traditional community, organization, or government within West Africa claimed the use of combretum micranthum as their intellectual property or specifically accused Rutgers of misappropriation.
Costa (2005).' Luteoforol, a flavan 4-ol, is induced in pome fruits by prohexadione-Ca and shows phytoalexin-like properties against Erwiniaamylovora and other plant pathogens'.
oxyacantha contains heptahydroxy flavan glycoside, flavan polymers.
They are present in the grape seed extracts and are composed of flavan units linked by [C.sub.4]-[C.sub.6] or [C.sub.4]-[C.sub.8] bonds forming dimmers, trimers, tetramers, and polymers up to 15 to 16 units (Prieur et al., 1994) with small amounts of catechin and epicatechin (Ricardo da Silva et al., 1990).
Su estructura basica (Flavan) consta de dos grupos fenilos unidos por un puente de tres carbonos que forma un anillo heterociclico oxigenado, esta combinacion C6-C3-C6 es llamada con frecuencia esqueleto difenil-propano, determinante en su reactividad quimica (Manach et al., 2004).
Northern Ireland's most in-demand shoe designer Anita Flavan came to the rescue at the Fate Awards last weekend - with a pair of killer heels for my missus.
In the 60th minute Graham Stuart put Saunders away for the striker to draw Flavan before chipping over his head only to see Russ Perrett hook the ball off the line.
The basic structural feature of flavonoids is the 2-phenylbenzopyrane or flavan nucleus, which consists of two benzene rings linked through a heterocyclic pyran ring (Brown 1980).