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Epitaxial Growth of Fat Crystals on Emulsifier Crystals with Different Fatty Acid Moieties
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2017-11-09 00:00:00 , DOI: 10.1021/acs.cgd.7b01039 Chinami Ishibashi 1 , Hironori Hondoh 1 , Satoru Ueno 1
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2017-11-09 00:00:00 , DOI: 10.1021/acs.cgd.7b01039 Chinami Ishibashi 1 , Hironori Hondoh 1 , Satoru Ueno 1
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We performed in situ observations of the crystallization and melting behaviors of palm mid fraction (PMF) on sorbitan ester (SE) crystals comprising different fatty acid moieties (sorbitan tripalmitate (STP), sorbitan tristearate (STS), or sorbitan tribehenate (STB)) to reveal the epitaxial relationship between fat crystals and emulsifier crystals. The effects of SEs on the thermal behavior and polymorphism of PMF were investigated by differential scanning calorimetry and synchrotron radiation X-ray diffraction. These measurements showed that the addition of STP and STS greatly increased the crystallization temperature of PMF, which was caused by the crystallized SEs that were nucleated prior to PMF. Microscopic observations demonstrated that PMF crystals were oriented in the same direction as crystals of STP and STS because the chain lengths of the fatty acid moieties were similar to those of PMF. In contrast, when STB was used as a substrate, PMF crystals were not oriented in the same direction as STB crystals because there is a large difference between the chain lengths of STB and PMF. These results revealed that crystal growth of PMF on STP and STS crystals occurs via epitaxial growth, whereas PMF crystallization on STB crystals occurs via general heterogeneous nucleation.
中文翻译：
不同脂肪酸部分的乳化剂晶体上脂肪晶体的外延生长
我们对包含不同脂肪酸部分（脱水山梨醇三棕榈酸酯（STP），脱水山梨糖醇三硬脂酸酯（STS）或脱水山梨糖醇三山be酸酯（STB））的脱水山梨醇酯（SE）晶体上棕榈中间馏分（PMF）的结晶和熔融行为进行了原位观察。揭示脂肪晶体和乳化剂晶体之间的外延关系。通过差示扫描量热法和同步辐射X射线衍射研究了SEs对PMF的热行为和多态性的影响。这些测量结果表明，STP和STS的添加极大地提高了PMF的结晶温度，这是由在PMF之前成核的结晶SEs引起的。显微观察表明，PMF晶体的取向与STP和STS晶体的方向相同，因为脂肪酸部分的链长与PMF相似。相反，当将STB用作衬底时，由于STB和PMF的链长之间存在较大差异，因此PMF晶体的取向与STB晶体的取向不同。这些结果表明，PMF在STP和STS晶体上的晶体生长是通过外延生长发生的，而STB晶体上的PMF结晶是通过一般的异质形核发生的。
更新日期：2017-11-09
中文翻译：
不同脂肪酸部分的乳化剂晶体上脂肪晶体的外延生长
我们对包含不同脂肪酸部分（脱水山梨醇三棕榈酸酯（STP），脱水山梨糖醇三硬脂酸酯（STS）或脱水山梨糖醇三山be酸酯（STB））的脱水山梨醇酯（SE）晶体上棕榈中间馏分（PMF）的结晶和熔融行为进行了原位观察。揭示脂肪晶体和乳化剂晶体之间的外延关系。通过差示扫描量热法和同步辐射X射线衍射研究了SEs对PMF的热行为和多态性的影响。这些测量结果表明，STP和STS的添加极大地提高了PMF的结晶温度，这是由在PMF之前成核的结晶SEs引起的。显微观察表明，PMF晶体的取向与STP和STS晶体的方向相同，因为脂肪酸部分的链长与PMF相似。相反，当将STB用作衬底时，由于STB和PMF的链长之间存在较大差异，因此PMF晶体的取向与STB晶体的取向不同。这些结果表明，PMF在STP和STS晶体上的晶体生长是通过外延生长发生的，而STB晶体上的PMF结晶是通过一般的异质形核发生的。
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