The influence of NaCl concentrations on the appearance/texture and rheological properties
was investigated in the emulsions prepared by high-pressure valve homogenizer. The visual
observations of the appearance and texture of the emulsions as related to ionic strength were
determined by visual classifying the emulsions into 2 types; fluid and paste that had low or high
viscosity and the syneresis phenomena (Demetriades et al., 1997). The emulsions appeared white
opaque and homogeneous. They remained as low-viscosity liquids at all NaCl concentrations studied
from 0 to 100 mM during storage time and higher NaCl concentrations gave thicker fluid emulsions.
The results indicated that increasing ionic strength decreased the electrostatic repulsion between
droplets because counter-ions in the aqueous phase shielded the charges on droplet surfaces
(Demetriades et al., 1997). However, we have tested the emulsion containing 150 mM NaCl and the
appearance showed high-viscosity paste with syneresis after storage for 2 days.