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.
(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).
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).