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The dsc thermal analysis of crystallization behavior in palm oil, II
Author(s) -
Kawamura K.
Publication year - 1980
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02675525
Subject(s) - differential scanning calorimetry , palm oil , isothermal process , crystallization , materials science , calorimeter (particle physics) , transformation (genetics) , differential thermal analysis , thermodynamics , chemical engineering , crystallography , chemistry , diffraction , optics , food science , gene , biochemistry , physics , detector , engineering
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 1 ’ crystals mixed with α, and β 2 ’ crystals. All underwent the typical transformations to the more stable forms; i.e., β 2 ’ → α → β 1 ’ → β. Isothermal conditions produced: (a) α crystals mixed with β 1 ’, (b) transformation from them to β 1 , and (c)β 2 and β 3 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.