Aplicação de modelo matemático às propriedades reológicas de géis mistos de agarose e de goma guar

Abstract

Federal do Rio de Janeiro-CP 68502-21945-970-Rio de Janeiro-RJ Recebido em 15/12/95; aceito em 24/10/96 APPLICATION OF A MATHEMATICAL MODEL TO THE RHEOLOGICAL PROPERTIES OF AGAROSE-GUAR GUM MIXED GELS. Certain biopolymers are capable of forming physically cross-linked gels in aqueous medium, stabilized by forces such as Coulombic, charge transfer, hydrogen bonding, dipole-dipole, van der Waals, and hydrophobic interactions. The mathematical description of these physical networks are difficult, but should contribute to a better understanding of the gelling process. The Clark and Ross-Murphy model was applied to experimental data for agarose-guar gum mixed systems, in which only agarose is the gelling polysaccharide. A computational routine based on the statistical maximum likehood principle was employed to estimate the f, K and a characteristic parameters. Statistical t-test and F-test were used to analyse the set of parameters.