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Comparative analysis of graded blends of palm kernel oil, palm kernel stearin and palm stearin
Chunhuan Liu1, Zong Meng1, Xiuhang Chai1
1State Key Laboratory of Food Science and Technology, School of Food Science and Technology, National Engineering Research Center for Functional Food, National Engineering Laboratory for Cereal Fermentation Technology, Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu, People's Republic of China.
Abstract:
A comprehensive analysis of graded binary and ternary blends of palm kernel oil (PKO), palm kernel stearin (PKS) and palm stearin (POs) was conducted, including solid fat content, iso-solid diagram, thermal properties, polymorphism and microstructure. Both PKO/POs and PKS/POs blends showed eutectic behavior. While PKO/PKS blends displayed good compatibility and only slightly monotectic effect at high temperature (above 30 °C). POs addition elevated binary phase transition temperature and accelerated the β crystal formation. PKO/POs and PKS/POs binaries showed β' polymorphism, β and β' polymorphism, and β polymorphism with different POs additions, while all of PKO/PKS blends showed β' polymorphism. Ternary blends (PKO/PKS/POs) showed eutectic effects, especially at high temperature (25 and 30 °C). POs addition made ternary blends undergo a polymorphism transformation from β' to β. Our findings open up the possibility of non-hydrogenated fat products as well as develop specific food formulations.
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