Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan

Detalhes bibliográficos
Autor(a) principal: Hernández,Raúl Bonne
Data de Publicação: 2007
Outros Autores: Yola,Oscar Reyes, Mercê,Ana Lucia Ramalho
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Journal of the Brazilian Chemical Society (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532007000700015
Resumo: This study provided the data for calculating the stability constants formed in the aqueous HCl equilibrium of chitosan and Cu2+, Mn2+ and Zn2+, and determined the species distribution diagrams to show the influence of pH in the complexation systems based on data obtained from potentiometric and spectrophotometric titrations. The solid complexes further obtained from these aqueous HCl systems, were investigated by infrared spectroscopy. It was verified that chitosan coordinated with the cations Cu2+, Mn2+ and Zn2+ at pHs >4 >5 and >2 respectively, in ligand to metal ratio of 1:1. The logarithms of the binding constants for ML species presented the following stability order: Cu2+>Zn2+>Mn2+. Some possible complexed structures were suggested having both N and/or O atoms as binding sites with one or two monomers of the biopolymer studied.
id SBQ-2_b499a1674aef11db1181d6247b6cc413
oai_identifier_str oai:scielo:S0103-50532007000700015
network_acronym_str SBQ-2
network_name_str Journal of the Brazilian Chemical Society (Online)
repository_id_str
spelling Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosanchitosandivalent cationspHstability constantsbiodegradable and biocompatible polymersThis study provided the data for calculating the stability constants formed in the aqueous HCl equilibrium of chitosan and Cu2+, Mn2+ and Zn2+, and determined the species distribution diagrams to show the influence of pH in the complexation systems based on data obtained from potentiometric and spectrophotometric titrations. The solid complexes further obtained from these aqueous HCl systems, were investigated by infrared spectroscopy. It was verified that chitosan coordinated with the cations Cu2+, Mn2+ and Zn2+ at pHs >4 >5 and >2 respectively, in ligand to metal ratio of 1:1. The logarithms of the binding constants for ML species presented the following stability order: Cu2+>Zn2+>Mn2+. Some possible complexed structures were suggested having both N and/or O atoms as binding sites with one or two monomers of the biopolymer studied.Sociedade Brasileira de Química2007-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532007000700015Journal of the Brazilian Chemical Society v.18 n.7 2007reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532007000700015info:eu-repo/semantics/openAccessHernández,Raúl BonneYola,Oscar ReyesMercê,Ana Lucia Ramalhoeng2008-01-08T00:00:00Zoai:scielo:S0103-50532007000700015Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2008-01-08T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan
title Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan
spellingShingle Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan
Hernández,Raúl Bonne
chitosan
divalent cations
pH
stability constants
biodegradable and biocompatible polymers
title_short Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan
title_full Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan
title_fullStr Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan
title_full_unstemmed Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan
title_sort Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan
author Hernández,Raúl Bonne
author_facet Hernández,Raúl Bonne
Yola,Oscar Reyes
Mercê,Ana Lucia Ramalho
author_role author
author2 Yola,Oscar Reyes
Mercê,Ana Lucia Ramalho
author2_role author
author
dc.contributor.author.fl_str_mv Hernández,Raúl Bonne
Yola,Oscar Reyes
Mercê,Ana Lucia Ramalho
dc.subject.por.fl_str_mv chitosan
divalent cations
pH
stability constants
biodegradable and biocompatible polymers
topic chitosan
divalent cations
pH
stability constants
biodegradable and biocompatible polymers
description This study provided the data for calculating the stability constants formed in the aqueous HCl equilibrium of chitosan and Cu2+, Mn2+ and Zn2+, and determined the species distribution diagrams to show the influence of pH in the complexation systems based on data obtained from potentiometric and spectrophotometric titrations. The solid complexes further obtained from these aqueous HCl systems, were investigated by infrared spectroscopy. It was verified that chitosan coordinated with the cations Cu2+, Mn2+ and Zn2+ at pHs >4 >5 and >2 respectively, in ligand to metal ratio of 1:1. The logarithms of the binding constants for ML species presented the following stability order: Cu2+>Zn2+>Mn2+. Some possible complexed structures were suggested having both N and/or O atoms as binding sites with one or two monomers of the biopolymer studied.
publishDate 2007
dc.date.none.fl_str_mv 2007-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532007000700015
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532007000700015
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-50532007000700015
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Journal of the Brazilian Chemical Society v.18 n.7 2007
reponame:Journal of the Brazilian Chemical Society (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Journal of the Brazilian Chemical Society (Online)
collection Journal of the Brazilian Chemical Society (Online)
repository.name.fl_str_mv Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv ||office@jbcs.sbq.org.br
_version_ 1750318168526553088

Registros relacionados