Análise do comportamento iônico em sistemas constituídos por micelas aniônicas, zwitteriônicas ou vesículas catiônicas: uma abordagem teórica por aproximação de campo médio / The analysis of ionic properties in anionic and zwitterionic micelles or cationic vesicles systems: a mean field theoretical approach

AUTOR(ES)

Tereza Pereira de Souza

DATA DE PUBLICAÇÃO

2006

RESUMO

Membranes and organelles are structures present in biological systems. Such structures are interfaces between electrolytes. Addressing to the description, interpretation and comprehension of the ionic distribution around the structures an attempt is done is this work analyzing experimental results from the investigation of the following systems: 1) SDS micelles. "pH" measurements in the micellar surface neighborhood using salicylic acid probes show the pH values dependence with the SDS and added salt concentrations. The experiments aimed to infer the pH behavior in biological membranes where same phospholipids may dissociate and portions of the surface can acquire electrical charges. 2) The zwitterionic nature of biological membranes leads to the investigation of ion binding in zwitterionic micelles in electrolyte solutions with varied concentrations of Cl- or Br

ASSUNTO(S)

sds lipossoma ph vesicles distribuiçao ionica pka pka micelles vesiculas micelas sds micelas zwitterionicas ph poisson-boltzmann ionic distribution zwitterionic micelles poisson-boltzmann liposome

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