Multi-Length-Scale Elucidation of Kinetic and Symmetry Effects on the Behavior of Stearic and Oleic TAG. II: OSO and SOO |
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Authors: | Mark R Baker Laziz Bouzidi Nissim Garti Suresh S Narine |
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Affiliation: | 1. Trent Biomaterials Research Program, Departments of Physics and Astronomy and Chemistry, Trent University, 1600 West Bank Drive, Peterborough, ON, K9J 7B8, Canada 2. Faculty of Science, Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Givat Ram, 91904, Jerusalem, Israel
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Abstract: | The phase composition of triacylglycerols (TAG) is determined by chemical structure and is greatly affected by kinetics. Positional isomerism and unsaturation are two key structural elements that govern, for a large part, the phase behavior of TAG during crystallization. Polymorphism, thermal properties, and microstructure of dioleoyl‐stearoyl isomers (OSO, SOO) were investigated at different cooling rates with XRD, DSC and PLM techniques, respectively. The physical properties of the symmetrical TAG were found to predictably vary with cooling rate; whereas, the properties of the asymmetrical TAG remained relatively constant. This was explained to be mainly due to the extra steric hindrance caused by asymmetry and the disturbances introduced at the “terrace” level via methyl‐end group interactions. The findings underscore the intricate contribution of saturation and symmetry to the phase trajectories of diunsaturated TAG. The knowledge gained will help understand the behavior of more complex materials and can be used for the manipulation of fat structures at different length scales and direct the manufacture of novel food systems and other relevant materials. |
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Keywords: | Oleoyl‐distearoyl triacylglycerols OSO SOO Polymorphism DSC Thermal behavior Solid fat content Polarized light microscopy Microstructure Kinetics Crystallization |
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