Stabilization of Liposomes by Polyelectrolytes: Mechanism of interaction and Role of Experimental Conditions

被引:15
作者
Rinaudo, Marguerite [2 ]
Quemeneur, Francois [1 ]
Pepin-Donat, Brigitte [1 ]
机构
[1] UJF, CNRS, CEA,INAC, Lab Elect Mol Organ & Hybride,UMR SPrAM 5819, F-38054 Grenoble 9, France
[2] Univ Grenoble 1, CNRS, Ctr Rech Macromol Vegetales, F-38041 Grenoble 9, France
关键词
chitosan; composite vesicles; hyaluronan; interaction lipid-polyelectrolytes; lipid membrane; LARGE UNILAMELLAR VESICLES; GIANT VESICLES; CHITOSAN; SURFACE; PH; ADSORPTION; STABILITY; MEMBRANES; SYSTEMS; SIZE;
D O I
10.1002/masy.200950409
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
zeta-potential measurements on LUVs allow to evidence the influence of pH, ionic salt concentration, and polyelectrolyte charge on the interaction between polyelectrolyte (chitosan and hyaluronan) and zwitterionic lipid membrane. First, chitosan adsorption is studied: adsorption is independent on the chitosan molecular weight and corresponds to a maximum degree of decoration Of 40% in surface coverage. From the dependence with pH and independence with MW, it is concluded that electrostatic interactions are responsible of chitosan adsorption which occurs flat on the external surface of the liposomes. The vesicles become positively charged in the presence of around two repeat units of chitosan added per lipid accessible polar head in acid medium down to pH = 7.2. Direct optical microscopy observations of GUVs shows a stabilization of the composite liposomes under different external stresses (pH and salt shocks) which confirms the strong electrostatic interaction between the chitosan and the lipid membrane. it is also demonstrated that the liposomes are stabilized by chitosan adsorption in a very wide range of pH (2.0 < pH < 12.0). Then, hyaluronan (HA), a negatively charged polyelectrolyte, is added to vesicles; the vesicles turn rapidly negatively charged in presence of adsorbed HA Finally, we demonstrated that hyaluronan adsorbs on positively charged chitosan-decorated liposomes at pH < 7.0 leading to charge inversion in the liposome decorated by the chitosan-hyaluronan bilayer. Our results demonstrate the adsorption of positive and/or negative polyelectrolyte at the surface of lipidic vesicles as well as their role on vesicle stabilization and charge control.
引用
收藏
页码:67 / 79
页数:13
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