Formation of Anthocyanin Ion-pairs. A Co-Pigmentation Effect

Detalhes bibliográficos
Autor(a) principal: Figueiredo, Paulo
Data de Publicação: 1994
Outros Autores: Pina, Fernando
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10884/500
Resumo: The influence of the addition of ionic salts (NaCI, NaBr, Nal, NaCIO,) on anthocyanin equilibria is studied in this work. The effect of their addition is a colour enhancement through the formation of an ion-pair between the charged flavylium cation and the anion, which displaces the equilibria towards the coloured flavylium form. The ion-pair formation is an alternative model to that which suggests a preferable hydration of salt anions instead of the flavylium cation. Throughout this work two natural anthocyanins are studied (malvidin 3,5-diglucoside and malvidin 3-glucoside) as well as one anthocyanidin (malvidin). The thermal and photochemical stability of the ion-pairs formed is also examined. Ex per i ments with a synthetic a n t h ocya n i n a na I og ue (4', 7 - d i h ydroxyf lavy I i u m c h lor ide) w h ic h has photochromic properties are also described for comparison purposes
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spelling Formation of Anthocyanin Ion-pairs. A Co-Pigmentation EffectAnthocyaninIon-pairsCo-pigmentationThe influence of the addition of ionic salts (NaCI, NaBr, Nal, NaCIO,) on anthocyanin equilibria is studied in this work. The effect of their addition is a colour enhancement through the formation of an ion-pair between the charged flavylium cation and the anion, which displaces the equilibria towards the coloured flavylium form. The ion-pair formation is an alternative model to that which suggests a preferable hydration of salt anions instead of the flavylium cation. Throughout this work two natural anthocyanins are studied (malvidin 3,5-diglucoside and malvidin 3-glucoside) as well as one anthocyanidin (malvidin). The thermal and photochemical stability of the ion-pairs formed is also examined. Ex per i ments with a synthetic a n t h ocya n i n a na I og ue (4', 7 - d i h ydroxyf lavy I i u m c h lor ide) w h ic h has photochromic properties are also described for comparison purposes2012-03-06T15:46:15Z1994-01-01T00:00:00Z1994info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10884/500engFigueiredo, PauloPina, Fernandoinfo: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:RCAAP2024-01-04T11:07:10Zoai:repositorio-cientifico.uatlantica.pt:10884/500Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:29:31.520766Repositório 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 Formation of Anthocyanin Ion-pairs. A Co-Pigmentation Effect
title Formation of Anthocyanin Ion-pairs. A Co-Pigmentation Effect
spellingShingle Formation of Anthocyanin Ion-pairs. A Co-Pigmentation Effect
Figueiredo, Paulo
Anthocyanin
Ion-pairs
Co-pigmentation
title_short Formation of Anthocyanin Ion-pairs. A Co-Pigmentation Effect
title_full Formation of Anthocyanin Ion-pairs. A Co-Pigmentation Effect
title_fullStr Formation of Anthocyanin Ion-pairs. A Co-Pigmentation Effect
title_full_unstemmed Formation of Anthocyanin Ion-pairs. A Co-Pigmentation Effect
title_sort Formation of Anthocyanin Ion-pairs. A Co-Pigmentation Effect
author Figueiredo, Paulo
author_facet Figueiredo, Paulo
Pina, Fernando
author_role author
author2 Pina, Fernando
author2_role author
dc.contributor.author.fl_str_mv Figueiredo, Paulo
Pina, Fernando
dc.subject.por.fl_str_mv Anthocyanin
Ion-pairs
Co-pigmentation
topic Anthocyanin
Ion-pairs
Co-pigmentation
description The influence of the addition of ionic salts (NaCI, NaBr, Nal, NaCIO,) on anthocyanin equilibria is studied in this work. The effect of their addition is a colour enhancement through the formation of an ion-pair between the charged flavylium cation and the anion, which displaces the equilibria towards the coloured flavylium form. The ion-pair formation is an alternative model to that which suggests a preferable hydration of salt anions instead of the flavylium cation. Throughout this work two natural anthocyanins are studied (malvidin 3,5-diglucoside and malvidin 3-glucoside) as well as one anthocyanidin (malvidin). The thermal and photochemical stability of the ion-pairs formed is also examined. Ex per i ments with a synthetic a n t h ocya n i n a na I og ue (4', 7 - d i h ydroxyf lavy I i u m c h lor ide) w h ic h has photochromic properties are also described for comparison purposes
publishDate 1994
dc.date.none.fl_str_mv 1994-01-01T00:00:00Z
1994
2012-03-06T15:46:15Z
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/10884/500
url http://hdl.handle.net/10884/500
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
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dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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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
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