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S. M. Levachev, A. E. Harlov, A. N. Kukuchkina, N. V. Novosyolova, V. N. Matveenko, S. R. Derkatch

Rheological behavior of concentrated emulsions stabilized by bovine serum albumin  and Tween 80

Abstract

Rheological behavior of concentrated emulsions toluene-in-water containing globular protein bovine serum albumin (BSA) and nonionic surfactant Tween 80 has been investigated at temperature 22oC. Concentration of disperse phase was 74 - 83 %. Influence nonionic surfactant which concentration varied in a wide range up to KKM and above KKM has been studied. It is shown, that emulsions under shear deformation behave as nonNewtonian liquids and are characterized by yield stress, at low shear rates on flow curves there is an area of the greatest Newtonian viscosity which decreases at increase in concentration of Twin 80. With increase in content of Twin 80 yield stress goes down in comparison with emulsions, stabilized by BSA without surfactant. The results are explained by changing composition of interphase adsorption layers formed on the surface of drops replacement of protein by low-molecular-mass surfactant during competitive adsorption.
Moscow University Chemistry Bulletin.
2006, Vol. 47, No. 3, P. 218
   

Copyright (C) Chemistry Dept., Moscow State University, 2002
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