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Study of the Polymorphism of Saturated Monoacid Triglycerides II: Polymorphic Behaviour of a 50/50 Mixture of Tripalmitin and Tristearin

✍ Scribed by Kellens, M. ;Reynaers, H.

Publisher: John Wiley and Sons
Year: 1992
Weight: 654 KB
Volume: 94
Category: Article
ISSN: 0931-5985
DOI: 10.1002/lipi.19920940803

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✦ Synopsis

The polymorphic behaviour of a 50/50 blend of tripalmitin and tristearin has been investigated in detail using differential scanning calorimetry and X-ray diffraction. The blend is characterized by a greater tendency to 6'-crystallization as compared to the pure triglycerides.

Tripalmitin and tristearin, when mixed in a 1 : I ratio, are miscible in both the a-form and the p'-form. In the @-form, however, demixing occurs, resulting in a 2-phase solid state. The characteristics of the aform are considerably affected by the crystallization conditions, due to the formation of concentration gradients during crystallization. The ' . It is apparent from the relatively complex polymorphism of triglycerides, that mixtures of triglycerides may demonstrate an even more complex phase behaviour.

Most studies on the phase behaviour of mixtures of

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## Abstract The crystallization and melting behaviour of tristearin has been considered in detail. Both the thermal and structural characteristics of the β'‐ and β‐crystal forms have been found to be largely dependent on the crystallization conditions. For the α‐form, crystallization takes place ve