Prorobinetidins are a type ofcondensed tannins formed fromrobinetinidol. They formrobinetinidin when depolymerized under oxidative conditions.
Mimosa andquebracho tannins are, according to a comparative13C NMR study of polyflavonoids, found to be predominantly profisetinidin/prorobinetidin-type tannins.[1]
Stryphnodendron adstringens ( the barbatimão), a species of legume found in Brazil, produces prorobinetinidins in its stem bark. These arerobinetinidol-(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 androbinetinidol-(4α → 6)-epigallocatechin, in addition to the tentatively characterized, robinetinidol [4β → 6(8)]-gallocatechin and robinetinidol-(4α → 8)-gallocatechin.[2][3]
