Surface reological properties and adsorption behavior of protein fibrils and protein-polysaccharide complexes at liquid-liquid and solid-liquid interfaces

K.N.P. Humblet-Hua, E. van der Linden, L.M.C. Sagis

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

Protein fibrils and protein-polysaccharide complexes are surface active, and can be used as emulsifiers, foam stabilizers, or encapsulating materials. Knowledge of the adsorption behavior of these materials on solid-liquid and liquid-liquid surfaces is important for developing new applications such as highly stable emulsions or encapsulation systems. In this study we have investigated the adsorption of two types of fibrils from lysozyme (long semi-flexible fibrils and short rigid fibrils), fibrils from ovalbumin (short and flexible), lysozyme-pectin complexes, and ovalbumin-pectin complexes, at oilwater interfaces, using ellipsometry. We have also characterized the surface dilatational and surface shear rheological properties of these interfaces, using an automated drop tensiometer, and a stress controlled rheometer with biconical disk geometry. We have also studied the multilayer adsorption of these materials at solid-liquid interfaces, to characterize their effectiveness as building blocks for multilayer encapsulation systems. The properties of the adsorbed layers (thickness, density, and distribution) were determined using reflectometry, ellipsometry and AFM. We will discuss the effect of the properties of the fibrils (length, flexibility), and complexes (size, charge distribution) on structure and rheological properties of the interfaces, and on their effectiveness as stabilizers for emulsions, foam, or encapsulation systems.
Original languageEnglish
Title of host publicationProceedings of the ISFRS 2012 - 6th International Symposium on Food Rheology and Structure, Zürich, Switzerland, 10-13 April 2012
Pages76-76
Publication statusPublished - 2012
EventISFRS 2012 - Zürich, Switzerland
Duration: 10 Apr 201213 Apr 2012

Conference

ConferenceISFRS 2012
CountrySwitzerland
CityZürich
Period10/04/1213/04/12

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