Propelargonidins are a type of
condensed tannin
Condensed tannins (proanthocyanidins, polyflavonoid tannins, catechol-type tannins, pyrocatecollic type tannins, non-hydrolyzable tannins or flavolans) are polymers formed by the condensation of flavans. They do not contain sugar residues.
The ...
s formed from
epiafzelechin. They yield
pelargonidin
Pelargonidin is an anthocyanidin, a type of plant pigment producing a characteristic orange color used in food and industrial dyes.
Natural occurrences Presence in flowers
Pelargonidin can be found in red geraniums (Geraniaceae). It is the p ...
when depolymerized under oxidative conditions.
Propelargonidins can be found in the rhizomes of the fern ''
Drynaria fortunei'', in buckwheat (''
Fagopyrum esculentum
Buckwheat (''Fagopyrum esculentum''), or common buckwheat, is a flowering plant in the knotweed family Polygonaceae cultivated for its grain-like seeds and as a cover crop. The name "buckwheat" is used for several other species, such as '' Fago ...
''), in the edible halophyte ''
Mesembryanthemum edule''.
Examples
*
Geranins A and B, dimers found in ''Geranium niveum''
*
Selligueain A, a trimer found in the rhizome of ''Selliguea feei''
* the trimeric propelargonidin
epiafzelechin-(4β→8)-epiafzelechin-(4β→8)-4′-O-methyl-(−)-epigallocatechin can be isolated from the stem bark of ''
Heisteria pallida''.
[A trimeric propelargonidin from stem bark of Heisteria pallida. Verena Dirsch, András Neszmélyia and Hildebert Wagner, Phytochemistry, 3 August 1993, Volume 34, Issue 1, Pages 291–293, ]
References
Condensed tannins
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