title: Novel stationary phase with regulated anion-exchange capacity.
abstract: A novel stationary phase--phenylaminopropyl (PLA) bonded silica--is proposed for anion-exchange chromatography. Low basicity (pKA about 2.5) attached to silica phenylaminopropyl groups allows a variation of surface density of protonated sites in the pH range from 2 to 5. This enables us to use the same column for the separation of anions having different affinity to anion-exchangers. The effect of mobile phase pH on conditional capacity of PhA-silica was studied. The hypothesis on dependence of ion-exchange selectivity on the column capacity is discussed. Suitability of PhA-silica for ion-chromatographic separation of organic and inorganic anions at different pH values of eluent was demonstrated.
authors.affiliation: Division of Analytical Chemistry, Lomonosov Moscow State University, Russian Federation.
authors.forename: M G
authors.initials: MG
authors.lastname: Kiseleva
authors.forename: P N
authors.initials: PN
authors.lastname: Nesterenko
mesh_terms: D000837:Anion Exchange Resins; D000838:Anions / Q000302:isolation & purification; D002852:Chromatography, Ion Exchange / Q000379:methods*; D006863:Hydrogen-Ion Concentration
chemical_list: D000837:Anion Exchange Resins; D000838:Anions