VDSpher

VDSpher® Ion-Exchange Phases

The product line VDSpher PUR is completed with ion-exchange phases based on silica gel.

The phase VDSpher PUR 100 NH2, known as a normal phase material, can be applied in the ion-exchange mode equally. Another option offered as weak anion-exchanger is the phase VDSpher PUR 100 PEI. For this, VDSpher PUR basic silica gel is modified with polyethylenimine via a spacer. VDSpher PUR PEI achieves the optimum anion-exchange capacity in the range of pH = 4-7. For the chromatographic separation, ionic strength and changes in pH value of the mobile phase are responsible for the adsorption and desorption of the analytes. The ion-exchange capacities of the available VDSpher 100 anion-exchange phases are shown in the Table.

Ion-Exchange Capacities: VDSpher® 100 Anion-Exchanger

Phase Ion exchange capacity [mmol/g]
NH₂ Classic & PUR 0.95
PEI PUR 2.1
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