RHEOLOGICAL PROPERTIES AND APPLICATIONS OF MESQUITE TREE (PROSOPIS JULIFLORA) GUM 2. RHEOLOGICAL PROPERTIES AND STABILITY OF O/W EMULSIONS CONTAINING MESQUITE GUM

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Abstract
Oil‐in‐Water emulsions stabilised by mesquite gum have been examined by their creep compliance‐time response at a constant low shear stress and by shear stress‐shear rate studies. The Theological data were influenced by pH, electrolyte (NaCl, CaCl2) and aging time. Both pH and electrolyte altered the degree of compactness of the mesquite molecules adsorbed on the oil drops. Aging produced changes in the rheological properties, the general trend depending on the rate of drop coalescence and the ability of adsorbed mesquite layers on adjacent flocculated drops to interpenetrate and form new linkages. The drop coalescence rate was highest at pH 7.0, but this was offset by greater interpenetration so that the rheological parameters increased substantially during aging.