Abstract
The mobility of phospolipids in free-standing and supported membranes was investigated on the level of individual molecules. For the analysis of trajectories a new statistical treatment was developed that permitted us to clearly distinguish different types of diffusional motion. A freely diffusing subfraction of lipids within supported membranes was identified. Its mobility was characterized by a mean lateral diffusion constant of D supp = 4.6 μm 2/s. In comparison, the mobility of lipids embedded in “free-standing” planar membranes yielded an increase in the mean diffusion constant by a factor of 4.5, D free = 20.6 μm 2/s. This increase is attributed to the ultrathin (≤1 nm) lubricating water layer between membranes and glass support.
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