Abstract
Crystallization rates of n-hexadecane dispersed oil-in-water (O/W) emulsion were studied by ultrasonic velocity measurement, differential scanning calorimetry and synchrotron X-ray diffraction. The hydrophobic food emulsifier, polyglycerol ester possessing a stearic acid moiety (DAS-750), was added to n-hexadecane as an impurity, to determine what effect it would have on the rate of the crystallization of n-hexadecane. A comparison of results obtained with O/W emulsion systems with those by bulk systems, indicated the following; (a) the addition of DAS-750 accelerated nucleation in the emulsion but not bulk system, (b) crystal growth rates were retarded by DAS-750. These results are discussed in terms of heterogeneous nucleation at interfaces of O/W emulsion droplets.
