Functional properties of Acacia nilotica var. adstringens gum

Abstract

This paper examines the emulsion stability and rheological properties of composite sample of A. nilotica var. adstringens gum from Kordofan state. Emulsification study of A. nilotica var. adstringens gum showed that the gum has an excellent emulsifying stability. Rheological behavior of aqueous solutions of Acacia nioltica var. adstringens gum shows that the gum solution at 25% concentration indicates a shear-thinning at lower shear rates, and a viscosity plateau (Newtonian behavior) at higher shear rates. At 50% concentration the gum solutions exhibits Newtonian flow. The dynamic rheological behavior of gum solution at 50% concentration shows that storage modulus (G′) was far less than loss modulus (G″) at all frequencies, energy of deformation is dissipated viscously and the sample exhibits liquid-like behavior.