Anthocyanins from a Norwegian potato cultivar

摘要

The main anthocyanins of purple sprouts of a Norwegian potato cultivar, Solanum tuberosum L., were isolated from a purified methanolic extract by preparative HPLC. Their structures were determined to be the novel anthocyanins, petunidin 3-O-[6-O-(4-O-E-caffeoyl-O-α-rhamnopyranosyl)-β-glucopyranoside]-5-O-β-glucopyranoside (1) (10%) and peonidin, 3-O-[6-O-(4-O-E-caffeoyl-O-α-rhamnopyranosyl)-β-glucopyranoside]-5-O-β-glucopyranoside (2) (6%) in addition to petunidin, 3-O-[6-O-(4-O-E-p-coumaroyl-O-α-rhamnopyranosyl)-β-glucopyranoside]-5-O-β-glucopyranoside, petanin (3) (37%) and peonidin, 3-O-[6-O-(4-O-E-p-coumaroyl-O-α-rhamnopyranosyl)-β-glucopyranoside]-5-O-β-glucopyranoside, peonanin (4) (25%). The same major anthocyanins, however, in other proportions (4, 54, and 32%, for 1, 3, and 4, respectively), were also found in the thin violet zone located in the flesh 0.5-1 cm from the surface of the tubers. This is the first report on anthocyanins from S. tuberosum, which are acylated with caffeic acid.