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On the Molecular Interactions in Lipid Bilayer–Water Assemblies of Different Curvatures
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2019-03-15 , DOI: 10.1021/acs.jpcb.8b11387
Martynas Talaikis 1 , Maria Valldeperas , Ieva Matulaitienė 2 , Jekaterina Latynis Borzova 1 , Justas Barauskas 3 , Gediminas Niaura 1 , Tommy Nylander
Affiliation  

This work concerns the importance of intermolecular interactions present in aqueous lipid assembly systems depending on the type of aggregates they form. We have studied aqueous mixtures of diglycerol monooleate, Capmul glycerol monoleate (GMO-50) and polyoxyethylene (20) sorbitan monooleate (Polysorbate 80, P80) using small-angle X-ray scattering (SAXS) measurements to reveal the structure of liquid crystalline phases. On the basis of the SAXS data, a phase diagram was constructed. We discuss the effect of curvature changes of the lipid–aqueous interface obtained by changing the water content and the temperature. The results are related to the intermolecular interactions, as revealed by Raman spectroscopy, with a focus on the bilayer type of system of different curvature and bilayer flexibility, namely, the lamellar phase, bicontinuous cubic phase, and sponge phase. All phases show large similarities in their chain conformation and head group interactions as revealed by the Raman spectra, arising from the fact that all three structures are formed by lipid bilayers. However, subtle differences in the molecular organization of the sponge phase were revealed by employing Raman difference spectroscopy and by analysis of key spectroscopic indicators, which show a less dense hydrocarbon chain packing compared to the inverse bicontinuous cubic or lamellar phase.

中文翻译:

不同曲率的脂质双层-水组装中的分子相互作用

这项工作涉及水性脂质组装系统中存在的分子间相互作用的重要性,这取决于它们形成的聚集体的类型。我们使用小角X射线散射(SAXS)测量研究了甘油二油酸酯,Capmul甘油单油酸酯(GMO-50)和聚氧乙烯(20)脱水山梨醇单油酸酯(Polysorbate 80,P80)的水性混合物。根据SAXS数据,构造了一个相图。我们讨论了通过改变水含量和温度获得的脂质-水界面的曲率变化的影响。结果与分子间的相互作用有关(如拉曼光谱法所揭示),重点是具有不同曲率和双层柔韧性的双层系统,即层状相,双连续立方相和海绵相。如拉曼光谱所揭示的,所有相在其链构象和头基相互作用中都显示出很大的相似性,这是由于所有三个结构均由脂质双层形成的事实引起的。然而,通过使用拉曼差光谱法和对关键光谱指示剂的分析揭示了海绵相的分子组织中的细微差异,与逆双连续立方相或层状相相比,它们显示出密度较小的烃链堆积。
更新日期:2019-03-15
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