Amphiphilic planar membranes in ionic equilibrium: a study of pH position-dependent values

Autor(es)

Bossa, Guilherme V. ^[1] ; Ratero, Davi R. ^[1] ; Neto, Augusto A. ^[1] ; Fahr, Alfred ^[2] ; Souza, Tereza P. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Inst Biociencias Letras & Ciencias Exatas, BR-15054000 Sao Joes Do Rio Preto, SP - Brazil

^[2] Univ Jena, Inst Pharm, D-07743 Jena - Germany

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 25, n. 6, p. 1041-1049, JUN 2014.
• Citações Web of Science: 0

Resumo

The pH values near a planar dissociating membrane are studied under a mean field approximation using the Poisson-Boltzmann equation and its linear form. The equations are solved in planar symmetry with the consideration that the charge density on the dissociating membrane surface results from an equilibrium process with the neighboring electrolyte. Results for the membrane dissociation degree are presented as a function of the electrolyte ionic strength and membrane surface charge density. Our calculations indicate that pH values have an appreciable variation within 2 nm from the membrane. It is shown that the dissociation process is enhanced due to the presence of bivalent ions and that pH values acquire better stability than in an electrolyte containing univalent ions. (AU)

• Processo FAPESP: 11/03150-8 - Determinação do grau de dissociação de aminoácidos polares carregados
• Beneficiário: Guilherme Volpe Bossa
• Modalidade de apoio: Bolsas no Brasil - Mestrado