Synchrotron Radiation X-ray Diffraction Study of Liquid Crystal Formation and Polymorphic Crystallization of SOS (sn-1,3-Distearoyl-2-oleoyl Glycerol)
Synchrotron Radiation X-ray Diffraction Study of Liquid Crystal Formation and Polymorphic Crystallization of SOS (sn-1,3-Distearoyl-2-oleoyl Glycerol)
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SOS（sn-1,3-二硬脂酰-2-油酰甘油）液晶形成和多晶型结晶的同步辐射X射线衍射研究
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发表时间：
1997
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影响因子：
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通讯作者：
Kiyotaka Sato
中科院分区：
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作者：
S. Ueno;Akiyoshi Minato;H. Seto;Y. Amemiya;Kiyotaka Sato
采用时间分辨同步辐射X射线衍射法（SR-XRD）研究了纯品SOS（sn-1，3-二硬脂酰-2-油酰甘油）的多晶型结晶。SOS有五种多晶型：α、γ、β ′、β2和β1。重点放在分析熔融介导的转化事件上，其中通过不太稳定的形式的快速熔融来诱导更稳定的形式（γ、γ '和β2）的结晶。这种结晶方式与长期争论的“记忆效应”密切相关，这一争论可能发生在三酰甘油从液体中的多晶型结晶中。应用了两种类型的热处理：（a）在最不稳定的α形式从液体中结晶后不久快速加热，以及（B）在α形式熔融前热退火20分钟后快速加热。以10秒的时间间隔监测SR-XRD测量。主要结果如下：（1）SOS片层有序化的形成速度比未形成的快。
Polymorphic crystallization of SOS (sn-1,3-distearoyl-2-oleoyl glycerol) has been studied with a time-resolved synchrotron radiation X-ray diffraction method (SR-XRD) using pure samples. SOS has five polymorphs: α, γ, β‘, β2, and β1. Emphasis was placed on analyzing the events of melt-mediated transformation, in which the crystallization of more stable forms (γ, β‘, and β2) was induced by rapid melting of the less stable forms. This mode of crystallization is closely related to a long running dispute concerning a “memory effect” possibly occurring in the polymorphic crystallization of triacylglycerols from liquid. Two types of thermal processes were applied: (a) a rapid heating soon after the least stable α form was crystallized from liquid and (b) a rapid heating after thermal annealing of the α form for 20 min before its melting. The SR-XRD measurements were monitored at a time interval of 10 s. The main results are as follows: (1) the formation of lamellar ordering of SOS occurred more rapidly than ...