Flavan-3-oIs

Epigallocatechin 3-O-gallate (flavan-3-oI gallic acid ester) Davidsonia pruriens (Davidsoniaceae), Hamamelis virginiana (Hamamelidaceae), Cinnamomum sp. (Lauraceae), Camellia sinensis (Theacaeae) PEP (1470 nM) [113]... 

TABLE 6.8. Fragment Ions of Flavan-3-oIs Generated in Both Negative- and Positive-Ion Mode"... 

Condensed T. are polymers in which the monomeric unit is a phenolic flavan, usually a flavan-3-ol, and in which the flavan units are link by 4 8 (C-C) bonds. Many higher oligomers and polymers of Proanthocyanidins (see) are therefore condensed vegetable T. An example is the procyanidin polymer from the seed coat of sorghum (Fig.). SynAesis of condensed T by hiomimetic condensation reactions has been reported. The condensation sequence is initiated by flavan-3-oIs acting as nucleophiles, and fla-van-3,4- ols as potential 4-carbenium ions [J.XBetha et al. Phytochemistry 21 (1982) 1289-1294 CL Hartisch H. Kolodziej Phytochemistry 42 (1996) 191—198]. 

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