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■ 7-O-Methylated Anthocyanidin Glycosides from the Reddish Purple Flowers of Catharanthus roseus ‘Equator Lavender’

Kenjiro Toki, Norio Saito, Mika Kitaura, Fumi Tatsuzawa,* Atsushi Shigihara, and Toshio Honda

*Laboratoryof Olericultural and Floricultural Science, Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka, Iwate 020-8550, Japan

Abstract

Four new anthocyanins (pigments 1 – 4) were isolated from the reddish purple flowers of Catharanthus roseus ‘Equator Lavender’, and identified to be hirsutidin 3-O-[6-O-(α-rhamnopyranosyl)-β-galactopyranoside]-5-O-galactopyranoside as pigment 4, and 3-O-[6-O-(α-rhamnopyranosyl)-β-galactopyranoside]s of 7-O-methylpetunidin as pigment 2, of 7-O-methyldelphinidin as pigment 3, and of hirsutidin as pigment 1 by chemical and spectroscopic methods. It is noteworthy that the findings of 7-O-methylpetunidin of pigment 2 and 7-O-methyldelphinidin of pigment 3 are the first report in plants. Furthermore, hirsutidin 3-O-[6-O-(α-rhamnopyranosyl)-β-galactopyranoside] of pigment 1 was observed as a main anthocyanin in the reddish purple flower of this plant.