Crystal Structure of Hydrogenated Canola Oil

  • A. Naguib-Mostafa
  • A. K. Smith
  • J. M. deMan


Scanning electron microscopy was used to study the crystal structure of hydrogenated Canola oil. Fixation of the samples was carried out at 10 C using osmium tetroxide vapor in a sealed container. Tristearin was used as a standard and was prepared in its three reported polymorphic forms α, β′ and β. Crystallization from ethyl acetate gave either a mixture of β′ and β or pure β′ polymorphic forms depending on the concentration of tristearin. Micrographs of these forms were obtained showing the morphology of the crystals. A Canola sample which was selectively hydrogenated to an iodine value of 70 was detergent fractionated, washed, dried and subjected to the same fixation procedure. Micrographs were obtained of its predominant β-polymorphic form.


Osmium Tetroxide Polymorphic Form Tristearin Polarize Light Microscope Dioctylsulfosuccinate 
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Copyright information

© American Oil Chemists’ Society 1985

Authors and Affiliations

  • A. Naguib-Mostafa
    • 1
  • A. K. Smith
    • 1
  • J. M. deMan
    • 1
  1. 1.Department of Food ScienceUniversity of GuelphGuelphCanada

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