Abstract Gelation of vegetable oils with candelilla wax (CW) and saturated triacylglycerols (TAGs) is a promising strategy for engineering fat-based foods, cosmetics, and drug delivery systems. n-hentriacontane (C31) defines, to a large extent, the thermal properties of CW. Therefore, the phase behavior and microstructure of binary mixtures of C31 and trimyristin (MMM), tripalmitin (PPP), or tristearin (SSS) were studied to provide a better understanding of complex mixtures of CW and saturated fats. Phase diagrams were developed by differential scanning calorimetry and X-ray diffraction measurements. The mixtures showed a eutectic phase behavior, in which the C31-TAG mixtures below the solidus line were solid dispersions of crystals rich in C31 and crystals rich in the corresponding TAG. This segregation in the solid phase was attributed to the incompatible subcell-packing of the pure components in the stable polymorphic form, which was orthorhombic for C31, and monoclinic for TAGs in the β-polymorphic form. C31 had a major effect on TAGs microstructure. Morphological changes at the microstructural level were caused by the heterogeneous nucleation of MMM on C31 crystals. Conversely, microstructural changes for TAGs crystals in C31-PPP and C31-SSS mixtures were induced by the inhibition of crystal growth due to the transient adsorption of C31 molecules at the growing crystal surface.

中文翻译：

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正十三烷和饱和单酸三酰基甘油混合物的相图

摘要 植物油与小烛树蜡 (CW) 和饱和甘油三酯 (TAGs) 的凝胶化是一种有前途的策略，可用于设计基于脂肪的食品、化妆品和药物递送系统。正十三烷 (C31) 在很大程度上决定了 CW 的热性能。因此，研究了 C31 和三肉豆蔻精 (MMM)、三棕榈精 (PPP) 或三硬脂精 (SSS) 的二元混合物的相行为和微观结构，以更好地了解 CW 和饱和脂肪的复杂混合物。相图是通过差示扫描量热法和 X 射线衍射测量得出的。混合物表现出共晶相行为，其中固相线以下的 C31-TAG 混合物是富含 C31 的晶体和富含相应 TAG 的晶体的固体分散体。固相中的这种分离归因于稳定多晶型形式的纯组分的不相容亚细胞堆积，这对于 C31 是正交的，而对于 β 多晶型形式的 TAGs 是单斜晶系。C31 对 TAG 的微观结构有主要影响。微观结构水平的形态变化是由 MMM 在 C31 晶体上的异质成核引起的。相反，C31-PPP 和 C31-SSS 混合物中 TAGs 晶体的微观结构变化是由于 C31 分子在生长晶体表面的瞬时吸附而抑制晶体生长引起的。微观结构水平的形态变化是由 MMM 在 C31 晶体上的异质成核引起的。相反，C31-PPP 和 C31-SSS 混合物中 TAGs 晶体的微观结构变化是由于 C31 分子在生长晶体表面的瞬时吸附而抑制晶体生长引起的。微观结构水平的形态变化是由 MMM 在 C31 晶体上的异质成核引起的。相反，C31-PPP 和 C31-SSS 混合物中 TAGs 晶体的微观结构变化是由于 C31 分子在生长晶体表面的瞬时吸附而抑制晶体生长引起的。