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Issue 10, 2011
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Theoretical studies of the phase behavior of DPPC bilayers in the presence of macroions

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Abstract

A molecular theory is developed to assess the effect that the adsorption of a macroion onto a DPPC phospholipid bilayer has on its phase behavior. The proposed theoretical approach considers the molecular details of the phospholipid molecules, including their charge density, size and molecular conformations. It was found that the favorable electrostatic interactions between the negatively charged macroion and the zwitterionic phosphocholine head-groups lead to the stabilization of the DPPC bilayer gel phase. Consequently, the main chain transition temperature from the gel phase to the liquid-crystalline phase is raised by tens of degrees upon adsorption of the negatively charged macroion. The shift in the main transition temperature increases with the surface charge density of the adsorbed macroion. These results are in line with experimental observations and show how changes in the phospholipid bilayer environment can result in profound effects on the structural and thermodynamic behavior of the lipid films.

Graphical abstract: Theoretical studies of the phase behavior of DPPC bilayers in the presence of macroions

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Publication details

The article was received on 14 Jan 2011, accepted on 17 Mar 2011 and first published on 14 Apr 2011


Article type: Paper
DOI: 10.1039/C1SM05061C
Citation: Soft Matter, 2011,7, 4672-4679
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    Theoretical studies of the phase behavior of DPPC bilayers in the presence of macroions

    D. Grillo, M. Olvera de la Cruz and I. Szleifer, Soft Matter, 2011, 7, 4672
    DOI: 10.1039/C1SM05061C

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