Acylated pelargonidin glycosides in red-purple flowers of Ipomoea purpurea
1996
Saito, N. | Tatsuzawa, F. | Yokoi, M. | Kasahara, K. | Iida, S. | Shigihara, A. | Honda, T.
Four acylated pelargonidin glycosides were isolated from the red-purple flowers of Ipomoea purpurea. The acylated anthocyanins were all based on pelargonidin 3-sophoroside-5-glucoside, acylated with caffeic acid and/or glucosylcaffeic acids. Three novel anthocyanins were elucidated to be pelargonidin 3-O-[2-O-(6-O(trans -3-O-(beta-D-glucopyranosyl)-caffeyl)-beta-D- glucopyranosyl)-6-O-(trans-4-O-(6-O-(trans-caffeyl) -beta-D-glucopyranosyl)-caffeyl)-beta-D-glucopyranoside] -5-O-[beta-D-glucopyranoside], pelargonidin 3-O-[2-O-(6-O-(trans-caffeyl)-beta-D-glucopyranosyl)-6-O-(trans-4- O-(6-O-(trans-caffeyl)-beta-D-glucopyranosyl)- caffeyl)-beta-D-glucopyranoside]-5-O-[beta-D-glucopyranoside] and pelargonidin 3-O[2-O-(6-O-(trans-caffeyl)-beta-D- glucopyranosyl)-6-O-(trans-caffeyl)-beta-D-glucopyranoside] 5 -O-[beta-D-glucopyosdide]. Another anthocyanin was pelargonidin 3-O-[2-O-(glucosylcaffeylglucosyl)-6-O-(caffeyl) -glucoside]-5-gluoside, which was reported to be present in the red-purple flowers of Pharbitis nil. Apart from the second pigment cited, these are analogous pigments of the violet-blue Ipomoea anthocyanins which are composed of acylated cyanidin glycosides, instead of pelargonidin.
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