Abstract
The processing and product characteristics of corn grit based formulations containing 5–15% w/w sunflower oil prepared using twin screw extrusion were compared. The formulations contained (i) corn grit and oil (Control) (ii) corn grit, heated protein-carbohydrate powder and oil (Encapsulant), and (iii) corn grit and microencapsulated oil powder stabilized by the heated protein-carbohydrate (Oil powder). The formulation, the dry feed rate and extrusion parameters affected the processibility and final product properties. Where neat oil was introduced into the barrel (Control and Encapsulant formulations), the surface oil of the extrudates generally increased with increasing oil content. When the microencapsulated oil powder was used, the surface oil was not markedly affected by increasing the oil content. The surface oil content was lowest when microencapsulated oil powder was used at equivalent oil content of extrudates. The oxidative stability of the oil in the extruded products containing corn grit-encapsulant powder or corn grit-microencapsulated oil powder were higher compared to that containing corn grit alone as the dry feed. Overall, the oxidative stability of extruded product containing polyunsaturated oils was enhanced by adding the heated protein-carbohydrate matrix to the formulation, while the highest oxidative stability was achieved using microencapsulated oil powder.
Published Version
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