Anthocyanins from tubers and shoots of the purple potato, Solanum tuberosum

The anthocyanin content of tubers and shoots of the purple potato, Solanum tuberosum cv. Congo has been determined using various chromatographic and spectroscopic techniques to be petanin and the novel 3-O-[6-(4-ferulyl-O-alpha-rhamnopyranosyl)-beta-glucopyranosides]-5-O-glucopyranosides of petunidin and malvidin. Acylated pigments constitute more than 98% of the total anthocyanin contents both in tubers and shoots.