Omega PS C18 Phase Information
Mixed-Mode Stationary Phase
Luna Omega PS C18 is a unique mixed-mode stationary phase that provides incredibly useful polar and non-polar retention. The surface of the PS C18 contains a positive charge which aids in the retention of acidic compounds through ionic interactions, while the C18 ligand promotes general reversed phase retention. This mixed-mode selectivity allows for greater separation between compounds with varying functional groups.
Enhanced Retention of Acids
With its positive surface (PS) the Luna® Omega PS C18 provides valuable increase in retention of acids through ionic/polar interactions. In addition, the C18 ligand also stimulates hydrophobic retention that greatly promotes increased resolution between analytes of interest.
Better Peak Shape for Bases
While traditional alkyl phases are prone to show tailing for basic compounds because of secondary interactions occurring at the silica surface, the surface of the Luna® Omega PS C18 was designed with positive charges that serve to repel strong basic species and consistently display sharp peak shape.