ИСТИНА

This work is devoted to the preparation and analytical application of novel covalently-bonded hyperbranched anion exchangers providing baseline resolution of the whole set of weakly retained organic acids (quinic, gluconic, shikimic, glycolic, acetic, formic, lactic, galacturonic, and propionic) together with seven standard inorganic anions, oxyhalides, and some polyvalent organic acids. To prepare anion exchangers with desired properties, we revealed the ways of manipulating selectivity of such phases by varying the branching degree and the hydrophilicity of the functional ion-exchange layer, the structure of the amine in the inner and outer parts of the layer, the type of quaternizing agent for such amine, and also the presence of polar and negatively charged substitutes in the layer. It was noted that temperature variations can also be advantageous for improving selectivity of anion exchangers with certain types of functional layers toward low-molecular weight organic acids.