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Systematic Characterization of DMPC/DHPC Self-Assemblies and Their Phase Behaviors in Aqueous Solution

机译:DMPC / DHPC自组装的系统表征及其在水溶液中的相行为

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Self-assemblies composed of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) and 1,2-dihexanoyl-sn-glycero-3-phosphocholine (DHPC) form several kinds of structures, such as vesicle, micelle, and bicelle. Their morphological properties have been studied widely, but their interfacial membrane properties have not been adequately investigated. Herein, we report a systematic characterization of DMPC/DHPC assemblies at 20 °C. To investigate the phase behavior, optical density OD500, size (by dynamic light scattering), membrane fluidity 1/PDPH (using 1,6-diphenyl-1,3,5-hexatriene), and membrane polarity GP340 (using 6-dodecanoyl-N,N-dimethyl-2-naphthylamine) were measured as a function of molar ratio of DHPC (XDHPC). Based on structural properties (OD500 and size), large and small assemblies were categorized into Region (i) (XDHPC & 0.4) and Region (ii) (XDHPC ≥ 0.4), respectively. The DMPC/DHPC assemblies with 0.33 ≤ XDHPC ≤ 0.67 (Region (ii-1)) showed gel-phase-like interfacial membrane properties, whereas DHPC-rich assemblies (XDHPC ≥ 0.77) showed disordered membrane properties (Region (ii-2)). Considering the structural and interfacial membrane properties, the DMPC/DHPC assemblies in Regions (i), (ii-1), and (ii-2) can be determined to be vesicle, bicelle, and micelle, respectively.
机译:由1,2-二肉豆蔻酰基-sn-甘油-3-磷酸胆碱(DMPC)和1,2-二己酰基-sn-甘油-3-磷酸胆碱(DHPC)组成的自组装体形成几种结构,例如囊泡,胶束,和比塞勒。它们的形态学性质已被广泛研究,但是它们的界面膜性质尚未得到充分研究。在本文中,我们报道了在20℃下DMPC / DHPC组件的系统表征。研究相行为,光密度OD500,尺寸(通过动态光散射),膜流动性1 / PDPH(使用1,6-二苯基-1,3,5-己三烯)和膜极性GP340(使用6-十二烷酰基-根据DHPC(XDHPC)的摩尔比测量N,N-二甲基-2-萘胺。根据结构特性(OD500和尺寸),将大型装配体和小型装配体分别分为区域(i)(XDHPC& 0.4)和区域(ii)(XDHPC≥ 0.4)。 DMPC / DHPC组件的0.33≤ XDHPC≤ 0.67(区域(ii-1))显示出类似凝胶相的界面膜特性,而富含DHPC的组件(XDHPC≥ 0.77)显示出混乱的膜特性(区域(ii-2))。考虑到结构和界面膜的特性,可以确定区域(i),(ii-1)和(ii-2)中的DMPC / DHPC组件分别为囊泡,比塞勒和胶束。

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