Charge distribution and calcium affinity of sulfated alpha-L-galactans from ascidians. Comparison between linear and highly branched polymers

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dc.contributor.authorRuggiero, J.
dc.contributor.authorFossey, Marcelo Andrés [UNESP]
dc.contributor.authorSantos, J. A.
dc.contributor.authorMourao, P. A. S.
dc.contributor.institutionUniversidade Federal do Rio de Janeiro (UFRJ)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:27:04Z
dc.date.available2014-05-20T15:27:04Z
dc.date.issued1998-02-01
dc.description.abstractCalcium binding and charge distribution on highly branched and linear sulfated L-galactans from ascidians have been studied using a metallochromic indicator and conductimetric titrations. The distance between charged groups of the linear and highly branched galactans does not vary despite their marked differences in sulfate/total sugar molar ratios. These results indicate that the sulfated L-galactose units are concentrated in the central polysaccharide core and not intercalated among non-sulfated units. This inference is consistent with the chemical studies of these galactans. Surprisingly, calcium affinity increases with increasing amounts of non-sulfated sugar branches in the molecule. Thus, calcium binding in these polymers is not a simple function of availability of anion binding sites but a more complex calcium-polysaccharide interaction. (C) 1998 Elsevier B.V. Ltd. All rights reserved.en
dc.description.affiliationUniv Fed Rio de Janeiro, Inst Ciências Biomed, Dept Bioquim, BR-21941590 Rio de Janeiro, Brazil
dc.description.affiliationUniv Estadual Julio de Mesquita Filho, Inst Biol Letras & Ciências Exatas, Dept Fis, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUniv Fed Rio de Janeiro, Fac Farm, Dept Anal Clin & Toxicol, BR-21951590 Rio de Janeiro, Brazil
dc.description.affiliationUnespUniv Estadual Julio de Mesquita Filho, Inst Biol Letras & Ciências Exatas, Dept Fis, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.format.extent545-550
dc.identifierhttp://dx.doi.org/10.1016/S0008-6215(97)10100-8
dc.identifier.citationCarbohydrate Research. Oxford: Elsevier B.V., v. 306, n. 4, p. 545-550, 1998.
dc.identifier.doi10.1016/S0008-6215(97)10100-8
dc.identifier.issn0008-6215
dc.identifier.lattes4101562077663619
dc.identifier.urihttp://hdl.handle.net/11449/37118
dc.identifier.wosWOS:000075389500009
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofCarbohydrate Research
dc.relation.ispartofjcr2.074
dc.relation.ispartofsjr0,617
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleCharge distribution and calcium affinity of sulfated alpha-L-galactans from ascidians. Comparison between linear and highly branched polymersen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes4101562077663619
unesp.author.orcid0000-0002-2012-388X[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt

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