NMR relaxation studies to explore the role of emulsifier in tristearin polymorphic transformation

R. Azoury*, J. S. Aronhime, S. Sarig, S. Abrashkin, I. Mayer, N. Garti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Proton magnetic resonance measurements were performed on α and β polymorphs of tristearin crystals. T1 relaxation time was measured with the Bruker PC Minispec at 20 MHz and 37° on the pure triglyceride crystals and therefore on tristearin crystallized in the presence of different solid surfactants. A significant negative correlation for T1 values and different compositions of α and β polymorphs in a mechanical mixture was found. The shortening of T1 relaxation time of the β form was found to be different for the various types of the added surfactants while they have no effect on the relaxation time of the α form. A model was proposed according to which the presence of additives, such as surfactants, generates vacancies within the crystal lattice of triglyceride and enhances the freedom of rotation of the fat molecule about the terminal carbon-carbon bond.

Original languageEnglish
Pages (from-to)964-967
Number of pages4
JournalJournal of the American Oil Chemists' Society
Volume65
Issue number6
DOIs
StatePublished - Jun 1988

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