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首页> 外文期刊>Crystal growth & design >Effects of Crystal Growth and Polymorphism of Triacylglycerols on NMR Relaxation Parameters. 2. Study of a Tricaprin-Tristearin Mixture
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Effects of Crystal Growth and Polymorphism of Triacylglycerols on NMR Relaxation Parameters. 2. Study of a Tricaprin-Tristearin Mixture

机译:三酰基甘油的晶体生长和多态性对NMR弛豫参数的影响。 2.甘油三癸酸酯-酪氨酸甘油酯混合物的研究

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摘要

Being able to determine the physical properties of fats such as polymorphism, and crystal size is very important for the food industry. After a relationship was observed between spin-lattice relaxation time and crystal size in a solid-liquid mixture of triacylglycerols, the effects of polymorphism and crystal size were investigated by low-field NMR relaxation and powder X-ray diffraction on three binary mixtures of tricaprin and tristearin in the solid state. Second moment (M-2) was proven to be only sensitive to polymorphism. Its measurements permitted the quantification of polymorphic forms in a binary mixture, with a model based on M-2 of the pure components. As for the spin-lattice relaxation time (T-1), it was proven to be only sensitive to crystal size and not to polymorphism. Quantification was not possible with T-1 measurements, but information on the pattern of the crystal thickness distribution was obtained using the maximization entropy method algorithm. The determination of polymorphism was thus possible because of the difference in size between the alpha and beta triacylglycerol crystals. Finally, a phase diagram mainly based on NMR data was constructed for the tricaprin/tristearin system.
机译:能够确定脂肪的物理性质(如多态性和晶体大小)对于食品工业非常重要。在三酰基甘油固液混合物中观察到自旋晶格弛豫时间与晶体尺寸之间的关系后,通过低场NMR弛豫和粉末X射线衍射研究了三辛精的三种二元混合物对多晶型和晶体尺寸的影响和三硬脂精固态。事实证明,第二刻(M-2)仅对多态性敏感。它的测量结果允许使用基于纯组分M-2的模型对二元混合物中的多晶型物进行定量。关于自旋晶格弛豫时间(T-1),已证明仅对晶体大小敏感,而对多态性不敏感。使用T-1测量无法进行量化,但是使用最大化熵方法算法可获得有关晶体厚度分布图的信息。由于α和β三酰基甘油晶体之间的大小差异,因此可以确定多态性。最终,建立了一个主要基于NMR数据的三癸酸酯/硬脂精系统相图。

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