chromatography technology Used to separate and/or analyse complex mixtures. The components to be separated are distributed between two phases: a stationary phase (bed) and a mobile phase which percolates through the stationary bed. The nature of the two phases determines the separation criteria exploited by the column such as affinity, ionic charges, size or hydrophobicity of the molecules under analysis. Each type of column can be implemented with the mobile phase under atmospheric or high pressure condition. In this later case columns are designated as High Pressure Liquid Chromatography (HPLC). PSI-MI MI:0091 column chromatography chromatography biochemical