Deep blue anthocyanins from blue Dianella berries.
Three anthocyanins, all acylated delphinidin 3,7,3',5'-tetraglucosides, and a naphthalene glycoside, 2-acetyl-1,5-dihydroxy-3 methyl-8-O(xylosyl-(1-->6)-glucosyl) naphthalene, have been isolated from the berries of two Dianella species, D. nigra and D. tasmanica. The anthocyanins show exceptional blueness at in vivo pH values due to effective intramolecular copigmentation involving p-coumaroyl-glucose units (GC) at the 7, 3' and 5' of the delphinidin anthocyanidin. Evidence is presented to show that the effectiveness of the copigmentation can be ranked; 3',5' GC>7 GC>3 GC.
Bloor
S J
SJ
Industrial Research Ltd, PO Box 31-310, Lower Hutt, New Zealand. s.bloor@irl.cri.nz
D000872:Anthocyanins / Q000737:chemistry / Q000302:isolation & purification*; D002851:Chromatography, High Pressure Liquid; D019668:Liliaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D015394:Molecular Structure; D013056:Spectrophotometry, Ultraviolet
D000872:Anthocyanins