Cleanert® PSA are silica-based, sorbent bonded with (N-aminoethyl) Aminopropyl functional group.

• It has two amino groups with pKa = 10.1 and 10.9, respectively
• This sorbent is an anion exchanger slightly stronger than Cleanert® NH₂
• It can be used for the extraction of metal ions by chelating interactions

It is also commonly used to remove organic acids, pigments and metal ions from organic samples such as vegetables and fruits.