How does liquid-solid chromatography separate polar compounds?

In liquid-solid chromatography, the separation of polar compounds is primarily achieved through the mechanism of adsorption.1

In this process, a porous solid stationary phase—typically materials such as silica or alumina—is used to retain polar solutes. Because these adsorbents have a high affinity for polar substances, the compounds interact with the stationary phase as they are transported through the column by a mobile phase.12

To ensure effective separation, a nonpolar or slightly polar solvent is preferred as the mobile phase; using a highly polar mobile phase would cause the solutes to be swept from the bed too rapidly, preventing proper resolution. The rate at which these compounds travel through the system depends on their relative affinity for the stationary phase: components that interact more strongly with the adsorbent require more time to elute, allowing for their separation based on differences in distribution behavior.12