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Anion-exchangers (QN-AX, QD-AX) and zwitterionic phases [ZWIX(+)(TM) and ZWIX(-)(TM)] were studied in a comparative manner. The effects of the nature and concentrations of the mobile phase solvent components and organic salt additives on analyte retention and enantioseparation were systematically studied in order to get a deeper insight into the enantiorecognition mechanism. Moreover, experiments were performed in the temperature range 10-50 degrees C to calculate thermodynamic parameters like changes in standard enthalpy, Delta(Delta H degrees), entropy, Delta(Delta S degrees), and free energy, Delta(Delta G degrees) on the basis of van't Hoff plots derived from the In alpha vs. 1/T curves. Elution sequences of the dipeptides were determined in all cases and, with a few exceptions, they were found to be opposite on the pseudoenantiomeric stationary phases as of QN-AX/QD-AX and of ZWIX(+) and ZWIX(-). The stere-oselective retention mechanism is based on electrostatically driven intermolecular interactions supported by additional interaction increments mainly determined by the absolute configuration of the chiral C8 and C9 atoms of the quinine and quinidine moieties. (C) 2019 Elsevier B.V. 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