科研之友
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摘要
Palm based diacylglycerol (P-DAG) oils not only have health-enhancing properties but also have distinct physicochemical characteristics. However, comprehensive information on the microstructure, rheology, and crystallization properties of P-DAG oils have yet to be conducted. Thus, P-DAG oils produced from palm stearin (PS), palm mid fraction (PMF), palm oil (PO), and palm olein (POL) were compared with corresponding palm based oils (P-oils) in terms of SFC, crystallization properties, rheology, hardness, and microstructure. On the basis of Avrami constant (k) and exponent (n), P-DAG oils showed higher nucleation and crystallization rate than P-oils and displayed no spherulitic crystal growth at all examined supercoolings. The complex modulus and phase angle indicated P-DAG oils except palm stearin DAG (PS-DAG) appeared to show more strengthening network structure and more solid-like nature compared to corresponding P-oils. Substantial changes in crystals size and shape were detected in morphological images of P-DAG oils excluding PS-DAG compared to corresponding P-oils. Nevertheless, all P-DAG oils showed extremely similar microstructural images with compact structures of very small needle-like crystals. Practical applications: This study provides valuable information about the microstructure, texture, rheology as well as the crystallization kinetics of palm-based diacylglycerol oils. These informative data will contribute to exploitation and application of P-DAG oils in plastic fat products in the future, which exhibited not only nutritional properties to treat obesity but also distinct physicochemical characteristics.
