Charged lipid monolayers at the air-solution interface: coupling to polyelectrolytes

被引：29

作者：

Bordi, F

Cametti, C

De Luca, F

Gili, T

Gaudino, D

Sennato, S

机构：

[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[2] INFM, Unita Roma, Rome, Italy

来源：

COLLOIDS AND SURFACES B-BIOINTERFACES | 2003年 / 29卷 / 2-3期

关键词：

cationic-zwitterionic lipids; polyelectrolytes; Gibbs energy;

D O I：

10.1016/S0927-7765(02)00185-6

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

The thermodynamic behaviour of mixed cationic-zwitterionic lipid mixtures dioleoyltrimethylammoniumpropanedipalmitoylphosphatidylcholine (DOTAP-DPPC) at different mole fractions have been investigated by means of surface pressure measurements (Langmuir isotherms). Excess Gibbs energies of mixing have been calculated as a function of layer composition and surface pressure. Deviation from ideality evidences different molecular organisation of the two lipids, yielding the formation of cationic lipid domains in a zwitterionic lipid matrix. The stability of the mixed monolayer in the presence of both a simple electrolyte solution (NaCl) and a polyelectrolyte solution (NaPAA of different molecular weights) in the same charge ratio interval has been investigated and the influence of the polymer conformation briefly discussed. (C) 2002 Elsevier; Science B.V. All rights reserved.

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页码：149 / 157

页数：9

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