Effect of cationic micelles on the decomposition of alpha-aminophenyl cephalosporins

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dc.contributor.authorOliveira, Anselmo Gomes de [UNESP]
dc.contributor.authorRossanezzi, G. [UNESP]
dc.contributor.authorFormariz, T. P. [UNESP]
dc.contributor.authorEgito, E. S. T.
dc.contributor.authorScarpa, M. V. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal do Rio Grande do Norte (UFRN)
dc.date.accessioned2014-05-20T13:24:49Z
dc.date.available2014-05-20T13:24:49Z
dc.date.issued2010-09-01
dc.description.abstractThe intramolecular rates of degradation of a-aminophenyl cephalopsorins were determined with and without hexadecyltrimethylammonium bromide (CTAB). Micellar-derived spectral shifts were used to measure the bind of the ionic forms as well as to determine the effect of CTAB on the apparent dissociation constant of the antibiotics. The rate of the degradation of cephalexin (Cp), cefadroxil (Cf), and cephradine (Cph), increased with surfactant concentration reaching a plateau at high surfactant concentrations. In the plateau region, the rate constant was salt sensitive decreasing with NaBr concentrations. These effects were quantitatively analyzed within the framework of the pseudo-phase model with explicit considerations of ion exchange. All the experimental results were fitted to this model. The intramolecular degradation of Cf. Cp and Cph was catalyzed by 96-, 59-, and 29-fold, respectively. A working hypothesis to rationalize these effects was suggested. The obtained results demonstrate that the quantitative analysis can be used to assess, predict and control the effects of surfactants on the drug stability. (C) 2010 Elsevier B.V. All rights reserved.en
dc.description.affiliationUNESP, Dept Farmacos & Medicamentos, Fac Ciencias Farmaceut, BR-14801902 Araraquara, SP, Brazil
dc.description.affiliationUniversidade Federal do Rio Grande do Norte (UFRN), Lab Sistemas Dispersos, Dept Farm, BR-59010180 Natal, RN, Brazil
dc.description.affiliationUnespUNESP, Dept Farmacos & Medicamentos, Fac Ciencias Farmaceut, BR-14801902 Araraquara, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.format.extent372-376
dc.identifierhttp://dx.doi.org/10.1016/j.colsurfb.2010.04.020
dc.identifier.citationColloids and Surfaces B-biointerfaces. Amsterdam: Elsevier B.V., v. 79, n. 2, p. 372-376, 2010.
dc.identifier.doi10.1016/j.colsurfb.2010.04.020
dc.identifier.issn0927-7765
dc.identifier.lattes9114495952533044
dc.identifier.urihttp://hdl.handle.net/11449/7803
dc.identifier.wosWOS:000280024100008
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofColloids and Surfaces B: Biointerfaces
dc.relation.ispartofjcr3.997
dc.relation.ispartofsjr1,071
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectalpha-Aminophenyl cephalopsorinsen
dc.subjectCationic micellesen
dc.subjectDrug stabilityen
dc.subjectIntramolecular degradationen
dc.subjectCephalosporins degradationen
dc.titleEffect of cationic micelles on the decomposition of alpha-aminophenyl cephalosporinsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes9114495952533044[1]
unesp.author.orcid0000-0002-0107-9940[1]
unesp.author.orcid0000-0002-2180-3991[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Farmacêuticas, Araraquarapt
unesp.departmentFármacos e Medicamentos - FCFpt

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Araraquara - FCF - Faculdade de Ciências Farmacêuticas