Spectrofluorimetric Determination of Second Critical Micellar Concentration of SDS and SDS/Brij 30 Systems

Autor(es)

Romani, Ana Paula ^[1] ; da Hora Machado, Antonio Eduardo ^[2] ; Hioka, Noboru ^[3] ; Severino, Divinomar ^[4] ; Baptista, Mauricio S. ^[4] ; Codognoto, Lucia ^[5] ; Rodrigues, Maira R. ^[5] ; Moises de Oliveira, Hueder Paulo ^[5]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Quim, FFCLRP, BR-14049 Ribeirao Preto - Brazil

^[2] Univ Fed Uberlandia, Inst Quim, LAFOT, BR-38400 Uberlandia, MG - Brazil

^[3] Univ Estadual Maringa, Dept Quim, Maringa, Parana - Brazil

^[4] Univ Sao Paulo, Inst Quim, Dept Bioquim, BR-01498 Sao Paulo - Brazil

^[5] Univ Vale Paraiba UNIVAP, Inst Pesquisa & Desenvolvimento IP&D, BR-12244000 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Fluorescence; v. 19, n. 2, p. 327-332, MAR 2009.
• Citações Web of Science: 21

Resumo

Potentially useful stead-state fluorimetric technique was used to determine the critical micellar concentrations (CMC(1) and CMC(2)) for two micellar media, one formed by SDS and the other by SDS/Brij 30. A comparative study based on conductimetric and surfacial tension measurements suggests that the CMC(1) estimated by the fluorimetric method is lower than the value estimated by these other techniques. Equivalent values were observed for SDS micelles without Brij 30 neutral co-surfactant. The use of acridine orange as fluorescent probe permitted to determine both CMC(1) and CMC(2). Based on it an explanation on aspects of micelle formation mechanism is presented, particularly based on a spherical and a rod like structures. (AU)

• Processo FAPESP: 02/00272-6 - Estudo e caracterização de polissacarídeos hidrofobicamente modificados
• Beneficiário: Maira Regina Rodrigues Magini
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 06/56701-3 - Estudo de processos de agregacao em moleculas com potencial aplicacao em terapia fotodinamica.
• Beneficiário: Hueder Paulo Moisés de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular