Abstract
Biological membrane is composed of lipid molecules, because of its fluidity, it is possible to carry out physiological functions. Therefore, it is important to study the hydrodynamic properties of membranes toward understanding its function. Here, we observed the dynamical behavior of a lipid monolayer on the water surface under Marangoni flow. By using X-ray reflectometry, we obtained the tilt angle of the hydrocarbon chains of the lipid at different surface pressures. Comparing them with the dynamical surface pressure under Marangoni flow, it was found that the lipid molecules in rotational rather than translational motion. At low surface pressure, the molecular tilt angle is reduced by 20 degrees, even though the molecular area is reduced by at most 10%.
Highlights
Lipid Monolayer on a Water SurfaceBiological membranes are formed by self-assembly of lipids in aqueous solutions.it is fluid and has lipid molecules and proteins diffused laterally
We investigated how the tilt angle of the alkyl chain of DSPC changes when the spontaneous oscillation of surface tension occurs
We have investigated the dynamics of the lipid monolayer under spontaneous oscillation of surface tension
Summary
Lipid Monolayer on a Water SurfaceBiological membranes are formed by self-assembly of lipids in aqueous solutions.it is fluid and has lipid molecules and proteins diffused laterally. Biological membranes have been treated as homogeneous membranes, but in recent years, microscopic observations have become possible, and it is becoming clear that biological membranes are not uniform fluids In these days, a concept of “raft model” has been widely accepted in which specific lipids and cholesterol aggregate to form a liquid-ordered phase, which exerts functions such as intracellular transport and signal transduction [1,2]. The liquid-ordered phase of the artificial membrane is observed as a micron-scale domain, such a large domain is not observed in the cell membrane This is because the actual cell membrane is placed in a nonequilibrium state, and lipid exchange is constantly occurring [3]. It is important to visualize the structure of the membrane in the flowing state to understand the behavior of biological membranes
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