Copure SCX is a silica-based strong cation exchanger. Its pheylsulfonic acid ligand engenders strong cation exchange capacity, while the benzene ring gives rise to additional non-polar interactions. SCX is able to extract positively charged basic compounds such as amines.
Copure SAX is a silica-based strong anion exchanger. Its quaternary ammonium ligand is always positively charged and engenders very strong anion exchange capacity. SAX is able to extract acidic compounds such as carboxylic acids.