Identification of galloylated propelargonidins and procyanidins in buckwheat grain and quantification of rutin and flavanols from homostylous hybrids originating from F. esculentum × F. homotropicum

From methanol extracts of buckwheat grains the following proanthocyanidins were identified epicatechin-[4-8]-epicatechin-dimethylgallate, epiafzelechin-[4-6]-epicatechin, epiafzelechin-[4-8]-epiafzelechin-[4-8]-epicatechin, epiafzelechin-[4-8]-epicatechin-dimethylgallate, epiafzelechin-[4-8]-epiafzelechin-[4-8]-epicatechin-dimethylgallate.