Abstract: The invention relates to the analysis of interactions of substances or materials with surfaces or interfaces made from amphiphilic materials and in particular partition coefficients and/or binding constants are determined. For this purpose use is made of a carrier material, which is so coated with amphiphilic molecules in the so-called fluid phase that the lateral diffusion of the amphiphilic molecules is substantially unimpeded. The invention also relates to a kit suitable for such analyses, and to a process for analyzing these interactions in column chromatography, particularly high pressure or performance liquid chromatography.