Enantioseparation by MEKC using a ligand exchange-based chiral pseudostationary phase

Electrophoresis. 2009 Aug;30(16):2869-73. doi: 10.1002/elps.200800832.

Abstract

In this paper, a new ligand-exchange -MEKC mode, based on the design of a unique lipohilic species (4'-octadecylneamine derivative), which served both as micelle-forming surfactant (by its hydrophobic part) and central ion-complexing ligand (by its hydrophilic part) is described. The CMC of the used lipophilic neamine derivative was first determined by surface tension measurements. Subsequent NMR experiments were performed in order to investigate the Cu(II) binding properties of the neamine micellar phase. The enantioseparation properties of both the octadecylneamine derivative-Cu(II) MEKC and the native neamine-Cu(II) CE systems were evaluated and compared using the tryptophan racemate as a probe analyte. The effects of several different electrophoretic conditions on the enantiomer migration behavior in the ligand-exchange-MEKC mode were examined. The developed methodology was also applied to the enantioseparation of other analytes such as 1-methyl-tryptophan, 3,5-diiodo-tyrosine and 1-naphtyl-alanine.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Chelating Agents
  • Chromatography, Micellar Electrokinetic Capillary / methods*
  • Copper
  • Ligands
  • Methanol / chemistry
  • Micelles
  • Neomycin / analogs & derivatives
  • Nuclear Magnetic Resonance, Biomolecular
  • Stereoisomerism
  • Surface Tension
  • Surface-Active Agents / chemistry
  • Tryptophan / analogs & derivatives
  • Tryptophan / chemistry

Substances

  • 4'-octadecylneamine
  • Chelating Agents
  • Ligands
  • Micelles
  • Surface-Active Agents
  • Copper
  • Tryptophan
  • Neomycin
  • Methanol