Título: Journal of Colloid and Interface ScienceImportada do Authenticus Pesquisar Publicações da Revista

Vol. 363

Páginas: 450-455

ISSN: 0021-9797

Editora: Elsevier

ISI Web of Knowledge - 22 Citações

Scopus - 28 Citações

FOS: Ciências exactas e naturais > Química

ID Authenticus: P-002-JN2

DOI: 10.1016/j.jcis.2011.07.098

Abstract (EN): The interaction of gum arabic (GA) with chitosan (Ch) of different degree of deacetylation was studied by turbidity measurements, dynamic light scattering and atomic force microscopy. The structure of the complexes was found to be directly related to the charge density of chitosan molecules. Gum arabic and chitosan with a degree of deacetylation of 75% form soluble complexes with a loosely globular structure of about 250 nm, at weight ratios up to 1.2, if the concentrations are kept low (total biopolymer concentration up to 0.06%). If chitosan has a higher charge density (degree of deacetylation of 93%), colloidal particles are formed, independently of the polymer concentration or ratio. At low concentrations and GA/Ch ratios of 1 or 1.2, the particles have diameters of 200-250 nm. The formation of soluble complexes is attributed to a chitosan lower charge density and the presence of non-charged monomers, which prevent the efficient self-assembly of the macromolecules.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Contacto: sandra.rocha@fe.up.pt

Nº de páginas: 6