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http://hdl.handle.net/20.500.12253/504
Título: | NEW ASPECTS OF ANTHOCYANIN COMPLEXATION. INTRAMOLECULAR COPIGMENTATION AS A MEANS FOR COLOUR LOSS? |
Autores: | Figueiredo, Paulo Elhabiri, Mourad Toki, Kenjiro Saito, Norio Dangles, Olivier Brouillard, Raymond |
Palavras-chave: | Anthocyanins Intramolecular copigmentation Dissacharide Hydrophilic effect |
Data: | 1996 |
Citação: | Phytochemistry, 41 (1996) 301-308 |
Resumo: | 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. |
URI: | http://hdl.handle.net/10884/504 |
Aparece nas colecções: | A CS/CN - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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phyto3.pdf | 968.83 kB | Adobe PDF | Ver/Abrir |
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