Abstract
Interaction of the cationic polymer poly-N-ethyl-4-vinylpyridinium bromide with bilayer vesicles (liposomes) composed of zwitterionic dipalmitoylphosphatidylcholine and anionic cardiolipin (the molar fraction of the negatively charged cardiolipin groups is 0.2) is studied. The composition and characteristics of the polycation-liposome complex are shown to be controlled by the phase state of the lipid membrane. Liposomes whose membranes exist in their LC state (“liquid” liposomes) keep their integrity in the complex with polycation. The adsorbed polycation can be completely removed from the liposomal membrane by the addition excess amounts of a competing polyanion. The adsorption of polycation on the surface of liposomes whose membranes exist the gel state (“solid” liposomes) leads to the formation of defects in the membrane, and the polycation’s adsorption with such liposomes becomes irreversible. The defects that form are also preserved when solid liposomes on whose surface the polycation is sorbed are transformed into the liquid state. Moreover, the reversible contact between polycation and liquid liposomes becomes irreversible once the liposomal membranes bound to the polycation transform into the solid state.
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Original Russian Text © A.A. Yaroslavov, A.A. Efimova, A.V. Sybachin, 2009, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2009, Vol. 51, No. 6, pp. 962–971.
This work was supported by the Russian Foundation for Basic Research, project no. 06-03-32907-a.
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Yaroslavov, A.A., Efimova, A.A. & Sybachin, A.V. Effect of the phase state of the lipid bilayer on the structure and characteristics of the polycation-(anionic liposome) complex. Polym. Sci. Ser. A 51, 638–647 (2009). https://doi.org/10.1134/S0965545X0906008X
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DOI: https://doi.org/10.1134/S0965545X0906008X