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Sample text
G. Roscoe, J. Lipkowski, Electrochemical and PM-IRRAS characterization of DMPC + cholesterol bilayers prepared using Langmuir-Blodgett/ Langmuir-Schaefer deposition, J. Electroanal. Chem. 621 (2008) 222–228. [13] D. Matyszewska, J. Leitch, R. Bilewicz, J. Lipkowski, PM-IRRAS studies of the influence of perfluorinated compounds on the properties of a model biological membrane, Langmuir 24 (2008) 7408–7412. L. Brosseau, J. Leitch, X. G. Roscoe, J. Lipkowski, Electrochemical and PM-IRRAS characterization of a glycolipid containing biomimetic membrane prepared using Langmuir-Blodgett/Langmuir-Schaefer deposition, Langmuir 24 (2008) 13058–13067.
In contrast to the pronounced changes in the tilt of the helices, the tilt angle of the acyl chains shows a weak dependence on the electrode potential and as a result one can conclude that the changes in the orientation of the helices are not induced by changes in the membrane structure. This behavior is in contrast to parallel changes of the tilt of the b-helix of gramicidin and the acyl chains of DMPC molecules seen earlier in Fig. 24 and illustrates that the effect of the lipids on the properties of peripheral and membrane proteins differs significantly.
This strategy allows one to determine the tilt angles of the chains in the two leaflets of the bilayer independently. 16 plots the chain tilt angles as a function of the electrode potential. 0 E (V) vs. 16 Plots of the angle between the acyl chain of h-DMPC molecule and the surface normal as a function of the electrode potential; (filled squares) for bilayer with h-DMPC in the bottom layer; (open squares) for bilayer with h-DMPC in the top layer, temperature 22 Æ 2 C. Adapted from Ref. [10]. h-DMPC monolayer constituting the bottom leaflet, and open points mark angles in the h-DMPC monolayer composing the top leaflet of the bilayer.
