New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss?
Autor(a) principal: | |
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Data de Publicação: | 1996 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10884/1337 |
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. |
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spelling |
New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss?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.2018-09-04T09:44:50Z1996-01-01T00:00:00Z1996-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleimage/pnghttp://hdl.handle.net/10884/1337engFigueiredo, PauloElhabiri, MouradToki, KenjiroSaito, NairoDangles, OlivierBrouillard, Raymondinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-04T11:08:03Zoai:repositorio-cientifico.uatlantica.pt:10884/1337Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:29:54.446778Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss? |
title |
New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss? |
spellingShingle |
New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss? Figueiredo, Paulo |
title_short |
New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss? |
title_full |
New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss? |
title_fullStr |
New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss? |
title_full_unstemmed |
New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss? |
title_sort |
New aspects of anthocyanin complexation. Intramolecular copigmentation as a means for colour loss? |
author |
Figueiredo, Paulo |
author_facet |
Figueiredo, Paulo Elhabiri, Mourad Toki, Kenjiro Saito, Nairo Dangles, Olivier Brouillard, Raymond |
author_role |
author |
author2 |
Elhabiri, Mourad Toki, Kenjiro Saito, Nairo Dangles, Olivier Brouillard, Raymond |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Figueiredo, Paulo Elhabiri, Mourad Toki, Kenjiro Saito, Nairo Dangles, Olivier Brouillard, Raymond |
description |
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. |
publishDate |
1996 |
dc.date.none.fl_str_mv |
1996-01-01T00:00:00Z 1996-01 2018-09-04T09:44:50Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10884/1337 |
url |
http://hdl.handle.net/10884/1337 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
image/png |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799136781055033344 |