The dsc thermal analysis of crystallization behavior in palm oil, II

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  • K. Kawamura
    Best Foods Research Center A Unit of CPC North America,Union 07083 New Jersey

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<jats:title>Abstract</jats:title><jats:p>Polymorphic behavior of palm oil crystals was investigated by means of a differential scanning calorimeter under isothermal and constant cooling conditions. Constant cooling conditions produced β<jats:sub>1</jats:sub>’ crystals mixed with α, and β<jats:sub>2</jats:sub>’ crystals. All underwent the typical transformations to the more stable forms; i.e., β<jats:sub>2</jats:sub>’ → α → β<jats:sub>1</jats:sub>’ → β. Isothermal conditions produced: (a) α crystals mixed with β<jats:sub>1</jats:sub>’, (b) transformation from them to β<jats:sub>1</jats:sub>, and (c)β<jats:sub>2</jats:sub> and β<jats:sub>3</jats:sub> crystals. In palm oil crystals, sorbitan tristearate retarded the transformation of the unstable α and β’ forms to the stable β form. This retardation, however, was greatly influenced by the cooling and heating conditions. Using that property of sorbitan tristearate, the polymorphic behavior of palm oil crystals could be studied in detail.</jats:p>

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