Effect of high intensity ultrasound on crystallization behavior and physical properties of high stearic high oleic sunflower oil soft stearin

Abstract

The objective of this research was to evaluatethe effect of high-intensity ultrasound (HIU) and crystallizationtemperature (Tc) on the crystallization behavior,melting profile, and elasticity of a soft stearin fraction ofhigh-stearic high-oleic sunflower oil. Results showed thatHIU can be used to induce and increase the rate of crystallizationof the soft stearin with significantly higher SFC valuesobtained in the sonicated samples, especially at higherTc. SFC values were fitted using the Avrami model, andhigher kn and lower n values were obtained when sampleswere crystallized with sonication, suggesting that sonicatedsamples crystallized faster and through an instantaneousnucleation mechanism. In addition, the crystal morphology,melting behavior, and viscoelasticity were significantlyaffected by sonication.