Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin
Identifieur interne : 000679 ( Istex/Checkpoint ); précédent : 000678; suivant : 000680Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin
Auteurs : M. Kellens [Belgique] ; W. Meeussen [Belgique] ; R. Gehrke [Allemagne] ; H. Reynaers [Belgique]Source :
- Chemistry and Physics of Lipids [ 0009-3084 ] ; 1991.
English descriptors
- Teeft :
- Angle diffraction pattern, Behaviour, Bilayer structure, Broad reflection, Catholic university, Chem, Complete crystallization, Cooling step, Crystal defects, Crystal growth process, Crystal perfection, Crystal structure, Crystalline order, Crystallization, Crystallization process, Crystallization temperature, Detectable amount, Detector distance, Different polymorphic forms, Differential scanning calorimetry, Diffraction, Diffraction angle, Diffraction measurements, Diffraction pattern, Diffraction patterns, Diffraction results, Diffraction spectra, Exothermic peaks, Exothermic processes, Experimental setup, Group planes, Heating process, Heating rate, High crystallization rate, Higher angle, Highest intensity, Isothermal crystallization, Isothermal crystallization processes, Kinetically favoured, Lamellar arrangement, Large tendency, Layer thickness, Long spacing, Longest spacing, Maximum intensity, Microscopic studies, Nucleation, Phase transition processes, Phase transitions, Polymorphic, Polymorphic behaviour, Polymorphic transitions, Present data, Publishers ireland, Rapid recrystallization, Recrystallization, Recrystallization process, Room temperature, Same rate, Sample holder, Simple rearrangement, Slower kinetics, Small angle, Small angle region, Small endotherm, Structural changes, Synchrotron, Synchrotron radiation, Synchrotron radiation data, Triglyceride, Triglyceride composition, Triglyceride molecules, Tripalmitin, Tristearin, Typical angle diffraction pattern, Upper part, Wide angle diffraction data, Wide angle diffraction patterns, Wide angle region.
Abstract
Abstract: Time-resolved X-ray diffraction studies of the polymorphic behaviour of tripalmitin and tristearin during crystallization and melting, have been performed using synchrotron radiation in combination with DSC. Both triglycerides show a large tendency towards β-crystallization. Upon melting the α-phase, recrystallization to β occurs very quickly. The present data do not indicate the intervention of a detectable amount of β′-form during the transformation of α to β. The β′-form can be crystallized from the α-melt without the intervention of the β′-form. No indications are found to support the existence of a liquid-crystalline structure in the α-melt: the slower recrystallization to β, the more isotropic the melt. The α-β transition cannot be described as a simple rearrangement of the molecules, but seems to involve a nucleation and crystal growth process. The high crystallization rate of β from the α-melt as compared to a β-crystallization from the isotropic melt, mainly results from the much faster nucleation, the latter being accelerated by the persistence of crystallites in the α-melt. Melting of the β-form involves a simultaneous increase in disorder in the lateral direction (in the a—b-plane) and along the c-axis of the crystal cell (lamellar arrangement). The present data do not support the persistence of a bilayer structure in the melt above the β-melting temperature. The β′-form of tripalmitin and tristearin can only be obtained from the isotropic melt and is characterized by a typical β′2-wide angle X-ray diffraction pattern. The two endotherms, appearing in the DSC-thermogram upon melting β′2, cannot be correlated with two independent β′-subforms (β′2 and β′1). Crystal perfection and crystallinity of the β′-form is considerably influenced by the crystallization conditions.
Url:
DOI: 10.1016/0009-3084(91)90119-V
Affiliations:
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ISTEX:FBBC58A16CBBDC9A2A335E4FF6D4204C53485D8FLe document en format XML
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<front><div type="abstract" xml:lang="en">Abstract: Time-resolved X-ray diffraction studies of the polymorphic behaviour of tripalmitin and tristearin during crystallization and melting, have been performed using synchrotron radiation in combination with DSC. Both triglycerides show a large tendency towards β-crystallization. Upon melting the α-phase, recrystallization to β occurs very quickly. The present data do not indicate the intervention of a detectable amount of β′-form during the transformation of α to β. The β′-form can be crystallized from the α-melt without the intervention of the β′-form. No indications are found to support the existence of a liquid-crystalline structure in the α-melt: the slower recrystallization to β, the more isotropic the melt. The α-β transition cannot be described as a simple rearrangement of the molecules, but seems to involve a nucleation and crystal growth process. The high crystallization rate of β from the α-melt as compared to a β-crystallization from the isotropic melt, mainly results from the much faster nucleation, the latter being accelerated by the persistence of crystallites in the α-melt. Melting of the β-form involves a simultaneous increase in disorder in the lateral direction (in the a—b-plane) and along the c-axis of the crystal cell (lamellar arrangement). The present data do not support the persistence of a bilayer structure in the melt above the β-melting temperature. The β′-form of tripalmitin and tristearin can only be obtained from the isotropic melt and is characterized by a typical β′2-wide angle X-ray diffraction pattern. The two endotherms, appearing in the DSC-thermogram upon melting β′2, cannot be correlated with two independent β′-subforms (β′2 and β′1). Crystal perfection and crystallinity of the β′-form is considerably influenced by the crystallization conditions.</div>
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