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Paper | Special issue | Vol 77, No. 1, 2009, pp.401-408
Published online, 25th August, 2008
DOI: 10.3987/COM-08-S(F)32
7-Acylated Anthocyanins with p-Hydroxybenzoic Acid in the Flowers of Campanula medium

Kenjiro Toki,* Norio Saito, Hiroyuki Nishi, Fumi Tatsuzawa, Atsushi Shigihara, and Toshio Honda

*Laboratory of Floriculture, Faculty of Floriculture, Minami-Kyushu University, 11609 Takanabe, Koyu-gun, Miyazaki 884-0003, Japan

Abstract

Three anthocyanins were isolated from the 50% acetic acid extract of the light blue-purple flowers of Campanula medium, ‘May Blue’. Among them, a new acylated anthocyanin was elucidated to be delphinidin 3-[6-O- (α-rhamnopyranosyl)-β-glucopyranoside]-7-O-[6-O-(4-O-(β-glucopyranosyl)-p- hydroxybenzoyl)-β-glucopyranoside] (5) as a main anthocyanin, together with two known anthocyanins, violdelphin (4) and delphinidin 3-O-rutinoside-7-O-glucoside (6) as minor anthocyanins. On anthocyanin components, three other cultivars of C. medium were investigated by HPLC analysis, and found that campanin (3) was present in the purple flowers of ‘May Purple’ as a main anthocyanin, rubrocampanin (1) was present in the pink flowers of ‘May Pink’ as a main anthocyanin, and purprocampanin (2) and rubrocampanin (1) were present in the purple-red flowers of ‘May Purple Margin’as major anthocyanins. From these results, the relations between the flower colors and anthocyanin components were discussed in the flowers of C. medium cultivars.