Lipid and lipid-polymer mixtures at an interface

被引:0
|
作者
Kim, JH [1 ]
Kim, MW [1 ]
机构
[1] Korea Adv Inst Sci & Technol, Dept Phys, Yusong Gu, Taejon 305701, South Korea
来源
STATISTICAL PHYSICS | 2000年 / 519卷
关键词
D O I
暂无
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
The surface pressure (II) and surface area/molecule (A) isotherms of a mixture of DMPC (DL-alpha-phosphatidylcholine,Dimyristoyl) and PEG-DMPE (1,2-Diacyl-sn-Glycero-3-Phosphoethanolamine-N-[Poly(ethylene glycol)5000]) system were measured at various compositions by the Langmuir surface balance technique at an air/water interface. In the range where the surface pressure is less than about 8 dynes/cm, a PEG polymer chain of PEG-DMPE molecules remains on the surface and the isotherm can be explained by the 2-D power law behavior of chains in a good solvent. In the range above 8 dynes/cm, a part of the PEG polymer segment is dissolved into the water phase, and the surface pressure can be explained as the sum of the 2-D component and 3-D component. Furthermore, the mixing energy is negative. which indicates an attractive interaction between DMPC and PEG-DMPE.
引用
收藏
页码:446 / 457
页数:12
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