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Phase transitions of canola oil sediment
Author(s) -
Liu H.,
Biliaderis C. G.,
Przybylski R.,
Eskin N. A. M.
Publication year - 1993
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/bf02542573
Subject(s) - canola , differential scanning calorimetry , sediment , materials science , supercooling , analytical chemistry (journal) , mineralogy , chemistry , chromatography , geology , thermodynamics , food science , paleontology , physics
Canola sediment was obtained from an industrial filter cake by solvent extraction. When heated in the differential scanning calorimeter (DSC) (5–100°C), the sediment exhibited a single narrow melting peak at around 74.8°C. No solid‐state polymorphic transformation of the material could be detected over this temperature range. The X‐ray powder diffraction pattern of canola sediment resembled waxes from other sources with an orthorhombic unit cell. The phase transition behavior of canola sediment in oil was studied by both DSC and polarizing microscopy. With increasing ratio of oil/sediment, a reduction in both melting temperature and transition enthalpy was observed. The shape of the supercooling curve resembled that of the melting curve. The induction time was determined by spectrophotometry and was used to calculate the interfacial free energy σ between sediment and oil; σ=4.71 erg/cm 2 . The effect of temperature and sediment concentration on the clouding time of canola oil was studied; the clouding time was the shortest at 5°C.