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 600 species of herbs and shrubs, in the mimosoid clade of the legume family Fabaceae. Species are native to the Americas, from North Dakota to northern Argentina, and to eastern Africa (Tanzania, Mozambique, and ...

'' and

quebracho tannin Quebracho is a common name in Spanish language, 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". The corresponding English- ...

s are, according to a comparative ¹³C NMR study of polyflavonoids, found to be predominantly profisetinidin/prorobinetidin-type tannins. ''

Stryphnodendron adstringens ''Stryphnodendron adstringens'' () 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'' stem bark is us ...

'' ( 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) Beta (, ; uppercase , lowercase , or cursive ; or ) is the second letter of the Greek alphabet. In the system of Greek numerals, it has a value of 2. In Ancient Greek, beta represented the voiced bilabial plosive . In Modern Greek, it represen ...

gallocatechin and robinetinidol-(4α → 8)-gallocatechin.

References

Condensed tannins {{polyphenol-stub