The Interaction In SPE Cartridge
When using the SPE cartridge, many kinds of interaction can be produced during the whole process.
The interaction between nonpolar functional group and nonpolar adsorbent on the target chemical compound is called non-polar interaction. This kind of interaction can be better reflected in the polar solvent and especially in water, so it is also called lyophobic interaction. The typical example is the interaction between phthalic acid esters and C18 in the water.
The interaction between polar functional groups on the target chemical compound and the adsorbent is called polar interaction. This kind of interaction can be well reflected in the weak polar solvent or nonpolar solvent.