Premium
Electrokinetic partial filling technique as a powerful tool for enantiomeric separation of DL ‐lactic acid by CE with contactless conductivity detection
Author(s) -
Maier Vítězslav,
Petr Jan,
Knob Radim,
Horáková Jana,
Ševčík Juraj
Publication year - 2007
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200600578
Subject(s) - electrokinetic phenomena , lactic acid , enantiomer , chromatography , conductivity , chemistry , analytical chemistry (journal) , materials science , nanotechnology , bacteria , biology , stereochemistry , genetics
Abstract A modified partial filling method for chiral separation of DL ‐lactic acid as the model chiral compound with vancomycin chloride as the chiral selector was developed by CE with contactless conductivity detection. Electrokinetic partial filling technique (EK‐PFT) was used as an alternative method to the conventional hydrodynamic partial filling method. EK‐PFT, in contrast to the hydrodynamic partial filling technique, allowed the removal of the chloride counterions from the chiral selector which otherwise led to poor sensitivity in conductivity detection. The baseline separation of DL ‐lactic acid as the model analyte was achieved in 5 min in a polyacrylamide‐coated capillary. The best resolution was achieved by electrokinetic partial filling of vancomycin cations from the injection solution containing 5 mmol/L oxalate L ‐histidinium at pH 4.5 with 10 mmol/L vancomycin chloride. Computer simulation was used to explain the observed phenomena in the boundary between the inject vial and the capillary during the EK‐PFT of vancomycin cations.