Heterogeneous Nucleation Effects of Talc Particles on Polymorphic Crystallization of Cocoa Butter
Heterogeneous Nucleation Effects of Talc Particles on Polymorphic Crystallization of Cocoa Butter
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DOI：
10.1021/acs.cgd.1c00859
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发表时间：
2021-12-23
影响因子：
3.8
通讯作者：
Calvet, Teresa
中科院分区：
文献类型：
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作者：
Bayes-Garcia, Laura;Yoshikawa, Shinichi;Calvet, Teresa
研究了在本体体系中添加不同浓度（0.1-5%）滑石粉对可可脂（CB）多晶型结晶的影响。当系统从熔体冷却并随后加热时，使用差示扫描量热法（DSC）和同步辐射X射线衍射（SR-XRD）分析CB的热流和晶体结构的变化。采用同步辐射微束X射线衍射（SR-mu-XRD）方法研究了滑石粉对CB晶体生长的影响。在任何冷却速率（0.1-15 ℃/min）下，滑石粉促进CB结晶，以提高起始结晶温度，并随滑石粉浓度的增加而增加;这种效果在较高的冷却速率下变得更加突出。滑石粉还充当多晶型稳定剂，使CB结晶在更稳定的形式，即使在15摄氏度/分钟的最高速率冷却时。此外，高度有序的层状平面方向被广泛观察到CB晶体发生与0.1%的滑石粉添加，这是由0.5%的滑石粉添加可能是由于密集的滑石粉颗粒在其随机取向的空间分散的干扰。这些非均质成核效应表明滑石颗粒用于CB基产品的质量和生产率控制的潜力。
Polymorphic crystallization of cocoa butter (CB) in a bulk system was examined for the influence of adding talc particles at different concentrations (0.1-5%). While the system was cooled from the melt and subsequently heated, changes in the heat flow and crystal structure of CB were analyzed using differential scanning calorimetry (DSC) and synchrotron radiation X-ray diffraction (SR-XRD). Synchrotron radiation microbeam X-ray diffraction (SR-mu-XRD) was employed to determine lamellar-plane directions of CB crystals occurring with talc addition. At any cooling rates (0.1-15 degrees C/min) applied, talc promoted CB crystallization to elevate the onset crystallization temperature logarithmically with the increasing concentration of talc; this effect became more prominent at higher cooling rates. Talc also acted as a polymorphic stabilizer so that CB crystallized in more stable forms even when cooled at highest rate of 15 degrees C/min. Moreover, a highly ordered lamellar-plane direction was extensively observed for CB crystals occurring with 0.1% talc addition, which was disturbed by 0.5% talc addition probably due to the spatial dispersion of densely populated talc particles in their randomized orientation. These heterogeneous nucleation effects indicate the potential of talc particles to be used for the quality and productivity control of CB-based products.