7-ACYLATED ANTHOCYANINS WITH p-HYDROXYBENZOIC ACID IN THE FLOWERS OF CAMPANULA MEDIUM

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(alpha-rhamnopyranosyl)-beta-glucopyranoside]-7-O-[6-O-(4-O-(beta-glucopyranosyl)-p- hydroxybenzoyl)-beta-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.