Portulaca oleracea gum and casein interactions and emulsion stability.

Citation:

N Garti, Slavin, Y, and Aserin, A. 1999. “Portulaca Oleracea Gum And Casein Interactions And Emulsion Stability.”. Food Hydrocolloids, 13, 2, Pp. 127–138. doi:10.1016/S0268-005X(98)00077-0.

Abstract:

It is well documented that weak or strong interactions between macromols. such as proteins or polysaccharides can synergistically improve the emulsifying capabilities of each of the biopolymers. A study was made to explore the nature of the adsorbed layer in emulsions formed in the presence of casein and a new anionic hydrocolloid extd. from Portulaca oleracea in several emulsification protocols. Electrophoretic mobility of medium chain triglyceride oil emulsion droplets and the corresponding adsorbing creamed phases were measured. The zeta potential magnitudes were calcd. in view of the possible pH dependent ionic-hydrogen bonding interactions between casein and a new ionic gum at the oil-water interfaces. Emulsions stability were detd. from the emulsification stability indexes and emulsification activity index. It was found that POG can adsorb by itself or together with casein onto the oil-water interface. Displacement of the POG from the interface by the casein will take place at pH values that will enhance repulsion forces between the biopolymers. However, complementary adsorption of a possible casein-POG complex will occur if the pH is enhancing the strong attraction interaction between the two biopolymers. The attraction forces between the two biopolymers will enhance the stability of oil-in-water emulsions formed in the presence of the two macromol. amphiphiles. [on SciFinder(R)]

Last updated on 05/27/2020