Please use this identifier to cite or link to this item:
Title: New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss?
Authors: Figueiredo, Paulo
Elhabiri, Mourad
Toki, Kenjiro
Saito, Nairo
Dangles, Olivier
Brouillard, Raymond
Issue Date: Jan-1996
Citation: Phytochemistry, Vol. 41, pages 301-308
Abstract: Two series of structurally related anthocyanins, extracted from the blue flowers of Evolvulus pilosus cv. Blue Daze and from the blue-purple flowers of Eichhornia crassipes, exhibit remarkable colour stabilities in aqueous solution at mildly acidic pH values. All the pigments possess the same chromophore (delphinidin), but a different pattern of glycosylation and acylation. Moreover, one of the pigments has an apigenin 7-glucoside molecule (a flavone) attached to the glycosidic chain by two ester bonds with malonic acid, instead of an aromatic acid and is the only known anthocyanin with such a structure. All the molecules studied, except one which has only a 3-gentiobioside (a disaccharide) as substituent, denote an effect of reduction in the hydration constant when compared with the parent delphinidin 3-glucoside or 3,5-diglucoside molecules, which supports the existence of intramolecular hydrophobic interactions between the chromophoric skeleton and the acyl or flavonoid groups. The role played by the sugar units on the hydrophobicity/hydrophilicity of the pigments is also discussed.
Appears in Collections:A CS/CN - Artigos

Files in This Item:
File Description SizeFormat 
Capture.PNG84.39 kBimage/pngThumbnail

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.