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Effect of Erucic Acid on the Polymorphism of Hydrogenated Rapeseed Oil

✍ Scribed by Cossement, M. ;Michaux, M. ;Lognay, G. ;Gibon, V. ;Deroanne, C.

Publisher
John Wiley and Sons
Year
1990
Weight
296 KB
Volume
92
Category
Article
ISSN
0931-5985

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✦ Synopsis

By M. C o s s e m e n t , M. M i c h a u x , G. L o g n a y , I ? G i b o n and C. D e r o a n n e *

The polymorphism of rapeseed oils with high and low erucic acid content was investigated using differential scanning calorimetry and X-ray diffraction. Both oils were hydrogenated to various iodine values. The f a t q acid pattern showed that erucic acid is slowly saturated. The melting curves were followed by DSC and pulsed NMR. For low iodine value the low erucic acid rapeseed oil exhibits a second melting peak owing to the appearance of new triglycerides with different properties. Samples of hydrogenated rapeseed oils were aged at 20Β°C and 29 "C. The short spacings determinations indicate that the p'+@ transition is faster for the low erucic acid rapeseed oil (LEAR) than for h e high erucic acid rapeseed oil (HEAR).

The stability of the p'-form increases with the heterogeneity of the fatty acid length. The interpenetration of the

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