Anthocyanins from fruits of Rubus pinnatus and Rubus rigidus.

摘要

The same anthocyanins, cyanidin 3-(6"-O- alpha -rhamnopyranosyl- beta -glucopyranoside) (compound 1), and cyanidin-3-O- beta -glucopyranoside (compound 2), were isolated from extracts of red fruits of Rubus pinnatus and purple-black fruits of Rubus rigidus (collected in Uganda) using Amberlite XAD-7 column chromatography, Sephadex LH-20 gel filtration and preparative HPLC. Their structures were elucidated by a combination of chromatography, homo- and heteronuclear NMR techniques. The relative amounts of compounds 1 and 2 in R. rigidus were 59.4 and 40.6%, respectively, while in R. pinnatus, the relative amounts were 58.6 and 41.4%, respectively.