Chiral separation of lenalidomide by liquid chromatography on polysaccharide-type stationary phases and by capillary electrophoresis using cyclodextrin selectors

Zoltán István Szabó, Mohammadhassan Foroughbakhshfasaei, Réka Gál, Péter Horváth, Balázs Komjáti, Béla Noszál, Gergő Tóth

Research output: Article

11 Citations (Scopus)

Abstract

Complementary techniques were applied for the investigation of the chiral recognition and enantiomeric resolution of lenalidomide using various cyclodextrins and polysaccharides as chiral selectors. The high-performance liquid chromatography enantioseparation of the anticancer drug was achieved using polysaccharide-type chiral stationary phases in polar organic mode. Elution order and absolute configuration were elucidated by combined circular dichroism spectroscopy and time-dependent density functional theory calculations after the isolation of pure enantiomers. Chiral selector dependent and mobile-phase dependent reversal of the enantiomer elution order was observed, and the nonracemic nature of the lenalidomide sample was also demonstrated. Eight anionic cyclodextrins were screened for their ability to discriminate between the uncharged enantiomers by using capillary electrophoresis. Only two derivatives presented chiral interactions, these cases being interpreted in terms of apparent stability constants and complex mobilities. The best results were delivered by sulfobutylether-β-cyclodextrin, where quasi-equal stability constants were recorded and the enantiodiscrimination process was mainly driven by different mobilities of the transient diastereomeric complexes. The optimized high-performance liquid chromatography (Chiralcel OJ column, pure ethanol with 0.6 mL/min flow rate, 40°C) and capillary electrophoresis methods (30 mM sulfobutylether-β-cyclodextrin, 30 mM phosphate pH 6.5, 12 kV applied voltage, 10°C) were validated for the determination of 0.1% (R)-lenalidomide as a chiral impurity, which could be important if a racemic switch is achieved.

Original languageEnglish
Pages (from-to)1414-1423
Number of pages10
JournalJournal of separation science
Volume41
Issue number6
DOIs
Publication statusPublished - márc. 2018

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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