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Multi-Length-Scale Elucidation of Kinetic and Symmetry Effects on the Behavior of Stearic and Oleic TAG. II: OSO and SOO

  • Original Paper
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Journal of the American Oil Chemists' Society

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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Acknowledgments

We would like to thank the Grain Farmers of Ontario, Elevance Renewable Sciences, Trent University, the GPA-EDC, Ontario Ministry of Agriculture, Food and Rural Affairs, Industry Canada and NSERC for financial support.

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Authors and Affiliations

  1. Trent Biomaterials Research Program, Departments of Physics and Astronomy and Chemistry, Trent University, 1600 West Bank Drive, Peterborough, ON, K9J 7B8, Canada

    Mark R. Baker, Laziz Bouzidi & Suresh S. Narine

  2. Faculty of Science, Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Givat Ram, 91904, Jerusalem, Israel

    Nissim Garti

Authors
  1. Mark R. Baker
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  2. Laziz Bouzidi
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  3. Nissim Garti
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  4. Suresh S. Narine
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Correspondence to Suresh S. Narine.

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Baker, M.R., Bouzidi, L., Garti, N. et al. Multi-Length-Scale Elucidation of Kinetic and Symmetry Effects on the Behavior of Stearic and Oleic TAG. II: OSO and SOO. J Am Oil Chem Soc 91, 1685–1694 (2014). https://doi.org/10.1007/s11746-014-2518-y

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  • DOI: https://doi.org/10.1007/s11746-014-2518-y

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