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Observation of buried water molecules in phospholipid membranes by surface sum-frequency generation spectroscopy

机译:通过表面和频生成光谱观察磷脂膜中埋藏的水分子

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摘要

We investigate the structure and orientation of water molecules at the water-lipid interface, using vibrational sum-frequency generation in conjunction with a maximum entropy phase retrieval method. We find that interfacial water molecules have an orientation opposite to that predicted by electrostatics and thus are likely localized between the lipid headgroup and its apolar alkyl chain. This type of water molecule is observed for phospholipids but not for structurally simpler surfactants.
机译:我们研究了水分子在水脂界面处的结构和取向,使用振动和频率生成结合最大熵相位反演方法。我们发现界面水分子的取向与静电预测的方向相反,因此可能位于脂质头基及其非极烷基链之间。在磷脂中观察到这种类型的水分子,但在结构上更简单的表面活性剂中则没有观察到。

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