Premium
NMR relaxation studies to explore the role of emulsifier in tristearin polymorphic transformation
Author(s) -
Azoury R.,
Aronhime J. S.,
Sarig S.,
Abrashkin S.,
Mayer I.,
Garti N.
Publication year - 1988
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/bf02544521
Subject(s) - chemistry , relaxation (psychology) , triglyceride , crystallography , molecule , stereochemistry , organic chemistry , cholesterol , biochemistry , psychology , social psychology
Proton magnetic resonance measurements were performed on α and β polymorphs of tristearin crystals. T 1 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 T 1 values and different compositions of α and β polymorphs in a mechanical mixture was found. The shortening of T 1 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.