Surface dipole potential at the interface between water and self-assembled monolayers of phosphatidylserine and phosphatidic acid

被引:38
作者
Moncelli, MR [1 ]
Becucci, L [1 ]
Buoninsegni, FT [1 ]
Guidelli, R [1 ]
机构
[1] Univ Florence, Dept Chem, I-50121 Florence, Italy
关键词
D O I
10.1016/S0006-3495(98)77947-0
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
The nature and magnitude of the surface dipole potential chi at a membrane/water interface still remain open to discussion. By combining measurements of differential capacity C and charge density sigma at the interface between self-assembled monolayers of phosphatidylserine and phosphatidic acid supported by mercury and aqueous electrolytes of different concentration and pH, a sigmoidal dependence of chi upon sigma is revealed, with the inflection at sigma = 0. This behavior is strongly reminiscent of the surface dipole potential due to reorientation of adsorbed water molecules at electrified interfaces. The small increase in C with a decrease in the frequency of the AC signal below similar to 80 Hz, as observed with phospholipid monolayers with partially protonated polar groups, is explained either by a sluggish collective reorientation of some polar groups of the lipid or by a sluggish movement of protons across the polar head region.
引用
收藏
页码:2388 / 2397
页数:10
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