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Note | Regular issue | Vol 75, No. 6, 2008, pp.1503-1509
Published online, 15th February, 2008
DOI: 10.3987/COM-08-11344
New Diacylated Delphinidin 3-Rutinoside-5-glucosides Isolated from the Blue-Purple Flowers of Browallia speciosa

Kenjiro Toki,* Norio Saito, Atsushi Shigihara, and Toshio Honda

*Laboratory of Floriculture, Minami Kyusyu University, Takanabe, Miyazaki 844-0003, Japan

Abstract

Two new diacylated delphinidin 3-rutinoside-5-glucosides were isolated from the blue-purple flowers of Browallia speciosa cv. ‘Purple’. As a major anthocyanin (1), delphinidin 3-O-[6-O-(4-O-(trans-caffeoyl)-α-L-rhamnopyranosyl)-β-D-glucopyranoside]-5-O-[2-O-(trans-p-coumaroyl)-β-D- glucopyranoside] was determined by chemical and spectroscopic methods. Another one was tentatively assigned to be the cis-p-coumroyl isomer of the major anthocyanin due to its small amount available. In the pigment 1, the 5-glucose residue of the anthocyanin is acylated with p-coumaric acid at 2-OH group of the sugar moiety, and this acylation pattern is the first report in plants.