Influence of Monounsaturated Triglycerides on the Crystallization Pathway of Fully Saturated Triglycerides

IF 3.2 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Julia Seilert*, Michael Rappolt, Georg Dol and Eckhard Flöter, 
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引用次数: 0

Abstract

The effect of composition on the polymorphic crystallization in blends of fully saturated and monounsaturated triglycerides was investigated (H3 denotes fully saturated, and H2U denotes monounsaturated triglycerides). Fully hydrogenated rapeseed oil (FHRO) and palm oil stearin (POSt) were used as H3 sources. Palm oil (PO) served as an H2U source. Different H3/H2U ratios and cooling rates (1, 5, and 10 °C min–1) were investigated. Differential scanning calorimetry, time-resolved small- and wide-angle X-ray scattering, and oscillatory shear experiments were employed to investigate the melting behavior as well as the nano- and microstructural development. The data reveal different kinetic pathways, even selective cocrystallization, depending on the molecular makeup of the H3 fraction. The POSt-PO blends first crystallize in an α phase that transitions into coexisting β′ and β phases. The FHRO-PO blends showed a longer persisting α phase that transitions into β even before a β′ phase could be identified. This indicated separate crystallization of H3 triglycerides. The polymorphic pathways are compared to the melting behavior and microstructural development during crystallization. Further, the question of mixed crystal formation in the H3 fraction of the FHRO-PO blends was addressed by studying H3 blend replicates in the absence of H2U triglycerides. This paper is the second part of a series investigating the interplay of polymorphic transition and mixed crystal formation.

A study on the isothermal crystallization pathways of trisaturated triglycerides of stearic (S) and palmitic (P) origin in the presence of monounsaturated triglycerides reveals multiple coexisting crystalline phases and phase segregation in S-containing triglycerides. The polymorphic pathway is further characterized by a slow lamellar restructuring.

单不饱和甘油三酯对完全饱和甘油三酯结晶途径的影响
研究了完全饱和甘油三酯和单不饱和甘油三酯共混物(H3表示完全饱和甘油三酯,H2U表示单不饱和甘油三酯)中组成对晶型结晶的影响。以全氢化菜籽油(FHRO)和棕榈油硬脂素(POSt)为H3源。棕榈油(PO)作为H2U的来源。研究了不同的H3/H2U比和冷却速率(1、5和10°C min-1)。采用差示扫描量热法、时间分辨小角和广角x射线散射和振荡剪切实验研究了熔融行为以及纳米和微观结构的发展。数据揭示了不同的动力学途径,甚至选择性共结晶,取决于H3馏分的分子组成。POSt-PO共混物首先在α相结晶,然后转变为共存的β′和β相。FHRO-PO共混物的α相持续时间更长,甚至在β′相被识别之前就转变为β相。这表明H3甘油三酯是单独结晶的。比较了晶化过程中多晶化途径的熔化行为和显微组织发育。此外,通过研究H3混合物在不含H2U甘油三酯的情况下的重复,解决了FHRO-PO混合物中H3部分混合晶体形成的问题。本文是系列研究多晶转变和混合晶体形成相互作用的第二部分。对硬脂酸(S)和棕榈酸(P)三饱和甘油三酯在单不饱和甘油三酯存在下的等温结晶途径的研究表明,含S的甘油三酯中存在多个共存的结晶相和相分离。多晶化途径的进一步特征是缓慢的片层重组。
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来源期刊
Crystal Growth & Design
Crystal Growth & Design 化学-材料科学:综合
CiteScore
6.30
自引率
10.50%
发文量
650
审稿时长
1.9 months
期刊介绍: The aim of Crystal Growth & Design is to stimulate crossfertilization of knowledge among scientists and engineers working in the fields of crystal growth, crystal engineering, and the industrial application of crystalline materials. Crystal Growth & Design publishes theoretical and experimental studies of the physical, chemical, and biological phenomena and processes related to the design, growth, and application of crystalline materials. Synergistic approaches originating from different disciplines and technologies and integrating the fields of crystal growth, crystal engineering, intermolecular interactions, and industrial application are encouraged.
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