NH2 Column Plates for Solid Phase Extraction

The B&M® NH2 (amino) is a silica gel-based aminopropyl extraction column. It has a polar steady-state phase and a weak anion exchanger, and can achieve retention by weak anion exchange (aqueous solutions) or polar adsorption (non-polar organic solutions), thus fulfilling a dual role. When used in non-polar solutions (e.g., hexane) for pretreatment, it can form hydrogen bonds with molecules with functional groups -OH, -NH, or -SH, aminopropyl PKa=9.8; it is weaker than SAX with anions, and it can be used as a weak anion exchanger to remove strong anions such as sulfonate from samples in aqueous solutions with pH<7.8.
The aminopropyl bound phase has strong polar adsorption in nonpolar organic solutions and weak anion exchange retention in aqueous solutions. NH2 works well in a wide range of sample matrices and can be used in the food, environmental, pharmaceutical, and medical industries.