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The goal of this thesis was to characterize the properties of tetramyristoyl cardiolipin (TMCL) and several environmental influences on it. This included investigating the pH and temperature dependency of TMCL as well as the influences of ROS on TMCL and exam-ining the lipid-protein interactions between TMCL and cytc. Furthermore, I extended the research to the analysis of binary mixtures composed of TMCL and dimyristoyl phosphati-dylcholine (DMPC). To this end, I investigated the samples with the aid of the Langmuir monolayer technique. This method allowed me to mimic interactions occurring at the membrane surface as it represents one membrane layer. The recording of π-A isotherms was also coupled with further other techniques like Brewster angle microscopy (BAM), Infrared Reflection-Absorption Spectroscopy (IRRAS), Grazing Incidence X-Ray Diffraction (GIXD) and Total Reflection X-Ray Fluorescence (TRXF) to enable a more comprehensive monolayer study. In addition, some systems were analyzed using Thin-layer Chromatography (TLC) and/or Differential Scanning Calorimetry (DSC) to be able to draw conclusions about sample composition or characteristic temperatures, respectively.