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Element-specific density profiles in interacting biomembrane models

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Schneck,  Emanuel
Emanuel Schneck, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Rodriguez-Loureiro,  Ignacio
Emanuel Schneck, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Bertinetti,  Luca
Luca Bertinetti (Indep. Res.), Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Gochev,  Georgi
Emanuel Schneck, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Citation

Schneck, E., Rodriguez-Loureiro, I., Bertinetti, L., Marin, E., Novikov, D., Konovalov, O., et al. (2017). Element-specific density profiles in interacting biomembrane models. Journal of Physics D: Applied Physics, 50(10): 104001. doi:10.1088/1361-6463/aa59d3.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-4C05-7
Abstract
Surface interactions involving biomembranes, such as cell-cell interactions or membrane contacts inside cells play important roles in numerous biological processes. Structural insight into the interacting surfaces is a prerequisite to understand the interaction characteristics as well as the underlying physical mechanisms. Here, we work with simplified planar experimental models of membrane surfaces, composed of lipids and lipopolymers. Their interaction is quantified in terms of pressure-distance curves using ellipsometry at controlled dehydrating (interaction) pressures. For selected pressures, their internal structure is investigated by standing-wave x-ray fluorescence (SWXF). This technique yields specific density profiles of the chemical elements P and S belonging to lipid headgroups and polymer chains, as well as counter-ion profiles for charged surfaces.