Regensburg 2019 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 6: Poster I

BP 6.16: Poster

Montag, 1. April 2019, 17:30–19:30, Poster B2

Effects of increased electrostatic repulsion between head groups of cardiolipin monolayers — Renko Kensbock, •Heiko Ahrens, and Christiane A. Helm — Institute of Physics, University of Greifswald, Germany

Cardiolipin is an anionic lipid, consisting of four hydrophobic alkyl chains and a hydrophilic head, which carries up to two charges. We investigate tetramyristoyl cardiolipin (TMCL) monolayers at the air-water interface with isotherms, grazing incidence diffraction and model calculations. TMCL undergoes a fluid (LE) to gel (LC) phase transition at a transition surface pressure π_c(T). By tuning the subphase composition, the surface charge density is varied. We verify the linear temperature dependence of π_c(T). With increasing surface charge density, the tilt of the alkyl chains in the LC phase increases. Furthermore, we find a correlation between the slope (dπ_c/dT) and the tilt of the alkyl chains in the gel phase. We compare the obtained TMCL monolayer results with other lipids from literature.