, Volume 63, Supplement 13, pp S29–S35 | Cite as

LC Enantioseparation of Aryl-Substituted β-Lactams Using Variable-Temperature Conditions

  • R. Berkecz
  • I. Ilisz
  • E. Forró
  • F. Fülöp
  • D. W. Armstrong
  • A. Péter


Direct reversed-phase high-performance liquid chromatographic methods were developed for the separation of enantiomers of β-lactams. The enantiomers of 7 aryl-substituted β-lactams were separated on chiral stationary phases containing the macrocyclic glycopeptide antibiotic teicoplanin (Chirobiotic T) and teicoplanin aglycone (Chirobiotic TAG) at 10-°C increments in the range 5–45 °C, using different compositions of 0.1% aqueous triethylammonium acetate (pH 4.1)/methanol (v/v) as mobile phase. The mobile phase composition and temperature were varied to achieve baseline resolutions in a single chromatographic run. The dependence of the natural logarithms of the selectivity factors ln α on the inverse of temperature, 1/T, was used to determine the thermodynamic data on the enantiomers. The thermodynamic data revealed that all the compounds in this study undergo separation via the same enthalpy-driven chiral recognition mechanism. The different methods were compared in systematic chromatographic examinations. The effects of the organic modifier, the mobile phase composition and the temperature on the separation were investigated.


Column liquid chromatography Temperature effect Chirobiotic T and TAG columns β-Lactams 


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Copyright information

© Friedr. Vieweg & Sohn/GWV Fachverlage GmbH 2006

Authors and Affiliations

  • R. Berkecz
    • 1
    • 2
  • I. Ilisz
    • 1
  • E. Forró
    • 2
  • F. Fülöp
    • 2
  • D. W. Armstrong
    • 3
  • A. Péter
    • 1
  1. 1.Department of Inorganic and Analytical ChemistryUniversity of SzegedSzegedHungary
  2. 2.Institute of Pharmaceutical ChemistryUniversity of SzegedSzegedHungary
  3. 3.Department of ChemistryIowa State UniversityAmesUSA

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