SIELC Technologies provides several different columns with negatively charged functional groups due to the embedded anionic ion-paring reagent. Primesep A is the strongest acidic column, while Primesep C is the weakest acidic column. The Primesep 100 and Primesep 200 columns are in between. Difference in the functional group acidity allows selecting the most appropriate column for a particular set of basic compounds that differ in their pKa value.
The column name corresponds to pH value of the mobile phase where acid residue on the column switches from ionize form to neutral one.
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