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■ A Novel Acylated Pelargonidin 3-Sophoroside-5-glucoside from Greyish-Purple Flowers of the Japanese Morning Glory

Kenjiro Toki, Norio Saito, Shigeru Iida, Atsushi Hoshino, Atsushi Shigihara, and Toshio Honda*

*Faculty of Pharmaceutical Sciences, Hoshi University, 2-4-41 Ebara, Shinagawa-ku, Tokyo 142-8501, Japan

Abstract

A novel acylated anthocyanin was isolated from greyish-purple flowers of a dingy mutant in the Japanese morning glory (Pharbitis nil or Ipomoea nil) with three known pigments as main pigments. This novel pigment was determined to be pelargonidin 3-O-[2-O-(β-D-glucopyranosyl)-6-O-(trans-4-O-(β-D-glucopyranosyl)caffeoyl)-β-D-glucopyranoside]-5-O-β-D-glucopyranoside (3), and the other three pigments (1, 2, and 4) were 3-sophoroside-5-glucosides of pelargonidin and peonidin, and peonidin 3-O-[2-O-β-D-glucopyranosyl-(6-O-(β-D-glucopyranosylcaffeoyl)-β-D-glucopyranoside]-5-O-β-D-glucopyranoside. In addition, pelargonidin 3-sophoroside and pelargonidin 3-glucoside were also detected as main pigments in two other mutants, duskish-1 and duskish-2, displaying pale-purple hue flowers.