Prorobinetidins 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.
They ...
s formed from
robinetinidol. They form
robinetinidin when depolymerized under oxidative conditions.
''
Mimosa
''Mimosa'' is a genus of about 590 species of herbs and shrubs, in the mimosoid clade of the legume family Fabaceae. The generic name is derived from the Greek word (''mimos''), an "actor" or "mime", and the feminine suffix -''osa'', "resembl ...
'' and
quebracho tannin
Quebracho is a common name in Spanish to describe very hard (density 0.9–1.3) wood tree species. The etymology of the name derived from ''quiebrahacha'', or ''quebrar hacha'', meaning "axe-breaker".
Species
There are at least three similar c ...
s are, according to a comparative
13C NMR study of polyflavonoids, found to be predominantly profisetinidin/prorobinetidin-type tannins.
''
Stryphnodendron adstringens
''Stryphnodendron adstringens'' ( pt, barbatimão) is a species of legume in the genus ''Stryphnodendron'' found in Brazil.
''Holcocera cerradicola'' is a moth, whose larvae feed on ''S. adstringens''.
Chemistry
''Stryphnodendron adstringens'' ...
'' ( the barbatimão), a species of legume found in Brazil, produces prorobinetinidins in its stem bark. These are
robinetinidol-(4β → 8)-epigallocatechin,
robinetinidol-(4α → 8)-epigallocatechin,
robinetinidol-(4β → 8)-epigallocatechin 3-O-gallate,
robinetinidol-(4α → 8)-epigallocatechin 3-O-gallate,
robinetinidol-(4α → 6)-gallocatechin and
robinetinidol-(4α → 6)-epigallocatechin, in addition to the tentatively characterized, robinetinidol
β → 6(8)gallocatechin and robinetinidol-(4α → 8)-gallocatechin.
References
Condensed tannins
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