Theory of lateral and flip-flop phase separations in bilayer biomembranes and surfactants

Benhamou, M.; Ouarch, M.; Kaidi, H.; Chahid, M.

doi:10.1016/j.physa.2008.02.032

Cited by 6 publications

(9 citation statements)

References 44 publications

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“…These conditions traduce the segregation phenomenon on each side of the bilayer. The temperature dependence of these energies was found to be [15] …”

Section: Presentation Of the Systemmentioning

confidence: 98%

“…Theoretically, a new theory [15] was recently introduced, to describe, in a consistent way, the demixing transition within the lipid bilayer composed of acyls chains of different length. This theory is constructed from compositions (Φ 1 , Φ 2 ) of the A-component on the two leafl ets.…”

Section: Presentation Of the Systemmentioning

confidence: 99%

“…To our opinion, a more realistic model should be rather a two-order parameter approach like the general one elaborated in Ref. [15]. Indeed, the surfactant may have different compositions on the outer and inner leafl ets.…”

Section: Tst In Surfactant Bilayersmentioning

confidence: 99%

“…With the help of the constructed free energy, which is a functional of compositions (Φ 1 , Φ 2 ), the critical phase behaviour of the mixture has been studied in details in Ref. [15].…”

Section: Presentation Of the Systemmentioning

confidence: 99%

“…When the LST and TST are second order transitions, an exact equation for the critical line in the (∆l, T)-plane has been derived [15], and along which the mixture phase separates. We do not recall here this equation, but we will extract from it all necessary information about the phase behaviour.…”

Section: Presentation Of the Systemmentioning

confidence: 99%

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Organization of Lipid Molecules within Biomembranes

Benhamou¹

2008

Lipid�Insights

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Abstract:In this review, we report on the organization of lipid molecules forming biomembranes. More precisely, the question is how these amphiphiles phase separate under a change of a suitable parameter, like temperature, pressure or membrane environment. The mixture may undergo a lateral or transversal phase separations. This essentially depends on two principal factors, which are the structure (length) of hydrocarbon chains of lipid molecules and the curvature asymmetry of membranes. When the former dominates, a lateral separation is then expected. In contrary, for those biomembranes of high curvature asymmetry, a vertical separation is rather observed. We examine the problem from a static (phase diagrams) and kinetics (relaxation in time) point of view. Finally, the discussion is also extended to the phase separation between lipid molecules and cholesterol in biomembranes (formation of rafts), between phospholipids and grafted polymers on liposomes, or between surfactant and its co-surfactant in bilayer systems.

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“…These conditions traduce the segregation phenomenon on each side of the bilayer. The temperature dependence of these energies was found to be [15] …”

Section: Presentation Of the Systemmentioning

confidence: 98%

Section: Presentation Of the Systemmentioning

confidence: 99%

Section: Tst In Surfactant Bilayersmentioning

confidence: 99%

“…With the help of the constructed free energy, which is a functional of compositions (Φ 1 , Φ 2 ), the critical phase behaviour of the mixture has been studied in details in Ref. [15].…”

Section: Presentation Of the Systemmentioning

confidence: 99%

Section: Presentation Of the Systemmentioning

confidence: 99%

See 3 more Smart Citations