Comparative study on the liquid chromatographic enantioseparation of cyclic β-amino acids and the related cyclic β-aminohydroxamic acids on Cinchona alkaloid-based zwitterionic chiral stationary phases

Attila Bajtai, Beáta Fekete, Márta Palkó, F. Fülöp, Wolfgang Lindner, Michal Kohout, I. Ilisz, A. Péter

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The enantiomeric pairs of cis and trans stereoisomers of cyclic β-aminohydroxamic acids and their related cis and trans cyclic β-amino acids containing two chiral centers were directly separated on four structurally related chiral stationary phases derived from quinine and quinidine modified with (R,R)- and (S,S)-aminocyclohexanesulfonic acids. Applying these zwitterionic ion-exchangers as chiral selectors, the effects of the composition of the bulk solvent, the acid and base additives, the structures of the analytes, and temperature on the enantioresolution were investigated. To study the effects of temperature and obtain thermodynamic parameters, experiments were carried out at constant mobile phase compositions in the temperature range 5–50°C. The differences in the changes in standard enthalpy Δ(ΔH°), entropy Δ(ΔS°), and free energy Δ(ΔG°) were calculated from the linear van't Hoff plots derived from the ln α versus 1/T curves in the studied temperature range. Results thus obtained indicated enthalpy-driven separations in all cases. The sequence of elution of the enantiomers was determined and found to be reversed when ZWIX(–)™ was changed to ZWIX(+)™ or ZWIX(–A) to ZWIX(+A).

Original languageEnglish
Pages (from-to)1216-1223
Number of pages8
JournalJournal of Separation Science
Volume41
Issue number6
DOIs
Publication statusPublished - Mar 1 2018

Fingerprint

Cyclic Amino Acids
Cinchona Alkaloids
Amino acids
Acids
Liquids
Enthalpy
Temperature
Stereoisomerism
Quinidine
Quinine
Ion exchangers
Enantiomers
Phase composition
Free energy
Entropy
Thermodynamics
Chemical analysis
Experiments

Keywords

  • amino acids
  • beta-aminohydroxamic acids
  • enantioseparation
  • high-performance liquid chromatography

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

Cite this

Comparative study on the liquid chromatographic enantioseparation of cyclic β-amino acids and the related cyclic β-aminohydroxamic acids on Cinchona alkaloid-based zwitterionic chiral stationary phases. / Bajtai, Attila; Fekete, Beáta; Palkó, Márta; Fülöp, F.; Lindner, Wolfgang; Kohout, Michal; Ilisz, I.; Péter, A.

In: Journal of Separation Science, Vol. 41, No. 6, 01.03.2018, p. 1216-1223.

Research output: Contribution to journalArticle

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