Crystallization and Transformation of Polymorphic Forms of Trioleoyl Glycerol and 1,2-Dioleoyl-3-rac-linoleoyl Glycerol

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• 作者：Laura Bay茅s-Garc铆a ; Teresa Calvet ; Miquel 脌ngel Cuevas-Diarte ; Satoru Ueno ; Kiyotaka Sato
• 刊名：The Journal of Physical Chemistry B
• 出版年：2013
• 出版时间：August 8, 2013
• 年：2013
• 卷：117
• 期：31
• 页码：9170-9181
• 全文大小：1044K
• 年卷期：v.117,no.31(August 8, 2013)
• ISSN：1520-5207

文摘

This study examined the influence of different thermal treatments on the crystallization and transformation of trioleoyl glycerol (OOO) and 1,2-dioleoyl-3-rac-linoleoyl glycerol (OOL). Two triacylglycerol (TAG) samples were cooled at 0.5鈥?5 掳C路min^鈥? and heated at 2 and 15 掳C路min^鈥?. The polymorphic characteristics of the two TAGs were analyzed in situ using differential scanning calorimetry, Raman spectroscopy, and synchrotron radiation X-ray diffraction. Multiple polymorphic forms were identified in OOO (伪, 尾鈥?sub>2, 尾鈥?sub>1, 尾₂, and 尾₁) and OOL (伪, 尾鈥?sub>2, and 尾鈥?sub>1). Larger quantities of more stable forms (e.g., 尾₂ and 尾₁ of OOO and 尾鈥?sub>1 of OOL) were obtained when the samples were slowly cooled and heated. In contrast, less stable polymorphs were obtained with increased cooling and heating rates. Polymorphic transformations occurred in either solid-state or melt-mediation and were influenced by heating rates. The results were analyzed by considering the activation energies for crystallization and transformation of stable and less stable polymorphic forms in comparison with previous studies on 1,3-dipalmitoyl-2-oleoyl-glycerol and 1, 3-dioleoyl-2-palmitoyl-glycerol.