ISOLUTE® PE-AX/SCX-2 is a silica-based media with chemically bonded propylsulfonic acid and quaternary amine functional groups. It is used for the isolation of a wide range of neutral compounds. ISOLUTE PE-AX/SCX-2 is available packed into SPE cartridges flow-through.
During catch & release the media bed "catches” the compound of interest. Rinsing the cartridge with solvent removes impurities, leaving the compound of interest on the cartridge for subsequent elution by an appropriate solvent. Biotage has a range of cartridges depending on whether the product to be recovered is acidic, basic or neutral. Applications include: purification, solvent switch, concentrating & capturing and HPLC fractions.
It may also be possible to retain impurities in step 3, such that the cartridge becomes a one pass, one step purification system.