All characterizations did not performed right after the preparation due to the initial period of delayed consistency found in emulsion systems with nonionic surfactants (Eccleston, 1990, 1982). The prepared dispersions were stored at 25 8C for 1 day before the investigation of their physical and rheological behaviors. Particle size measurements revealed that an increase in the lipid concentration resulted in an increase in the mean particle size of SLNs. At 5 and 10% (w/w) lipid concentrations, the average particle diameters were 397