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首页> 外文期刊>Chemistry: A European journal >Generic Phase Behavior of Branched-Chain Phospholipid Monolayers
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Generic Phase Behavior of Branched-Chain Phospholipid Monolayers

机译：支链磷脂单分子层的一般相行为

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摘要

Monolayers of chemically modified triple-chain phospholipids have been investigated at the air/water interface using pressure-area isotherms. The condensed phases of the lipids were characterized by grazing incidence X-ray diffraction (GIXD). Increasing chain length corresponds to a temperature effect, which was quantified for different lipids, depending on the head group structure using isotherm (two-dimensional systems) and DSC (three-dimensional systems) measurements. The combination of structure investigations revealed generic phase diagrams, which describe the phase behavior of multiple-chain lipids in two dimensions. For the 1-acyl-2-O-alkyl phospholipids, the generic phase diagram exhibits only L_(2d), LS and LE phases while the exchange of the position of the branched acyl and the non-branched alkyl chains at the glycerol backbone leads to a much richer polymorphism (L_(2h), L_(2d), Ov, LS, S, tau, LE). Here we present the first experimental evidence of the unusual tau phase for multiple-chain lipid monolayers. This phase exhibits an undistorted in-plane lattice despite of tilted chains.
机译：已经使用压力-面积等温线在空气/水界面处研究了化学修饰的三链磷脂的单分子层。通过掠入射X射线衍射（GIXD）表征脂质的浓缩相。链长的增加对应于温度效应，根据等温线（二维系统）和DSC（三维系统）的测量结果，根据头基结构，对不同的脂质进行了量化。结构研究的结合揭示了通用相图，该相图描述了二维多链脂质的相行为。对于1-酰基-2-O-烷基磷脂，通用相图仅显示L_（2d），LS和LE相，而甘油骨架上支链酰基和非支链烷基链的位置交换导致到更丰富的多态性（L_（2h），L_（2d），Ov，LS，S，tau，LE）。在这里，我们提出了多链脂质单层的不寻常tau相的第一个实验证据。尽管链倾斜，该相仍显示出未变形的面内晶格。

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