Acylated cyanidin glycosides in the violet-blue flowers of Ipomoea purpurea.
Six acylated cyanidin glycosides were isolated from violet-blue flowers of Ipomoea purpurea. These anthocyanins were all based on cyanidin 3-sophoroside-5-glucoside, acylated with caffeic acid and/or p-coumaric acid. Three anthocyanin structures were elucidated to be cyanidin 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-glucopyran osyl) caffeyl)-beta-D-glucopyranoside]-5-O(-)[beta-D-glucopyranoside], cyanidin 3-O(-)[2-O-(trans-3-O-(beta-D-glucopyranosyl)caffeyl)-beta-D-glucopyrano syl)- 6-O-(trans-caffeyl)-beta-D-glucopyranoside]-5-O(-)[beta-D-glucopyranosid e d and cyanidin 3-O(-)[2-O-(6-O-(trans-caffeyl)-beta-D-glucopyranosyl)-6-O- (trans-caffeyl)-beta-D-glucopyranoside]-5-O(-)[beta-D-glucopyranoside]. These three anthocyanins were present in all 12 violet-blue flower strains as major pigments. The colours of these acylated antocyanins were stabler in neutral solution than their deacyl analogues.
D000872:Anthocyanins / Q000737:chemistry / Q000302:isolation & purification*; D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010860:Pigments, Biological / Q000737:chemistry / Q000302:isolation & purification; D010944:Plants / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment
D000872:Anthocyanins; D010860:Pigments, Biological