Separation of very hydrophobic analytes by micellar electrokinetic chromatography IV. Modeling of the effective electrophoretic mobility from carbon number equivalents and octanol-water partition coefficients.
It is investigated whether those relationships derived within an optimization scheme developed previously to optimize separations in micellar electrokinetic chromatography can be used to model effective electrophoretic mobilities of analytes strongly differing in their properties (polarity and type of interaction with the pseudostationary phase). The modeling is based on two parameter sets: (i) carbon number equivalents or octanol-water partition coefficients as analyte descriptors and (ii) four coefficients describing properties of the separation electrolyte (based on retention data for a homologous series of alkyl phenyl ketones used as reference analytes). The applicability of the proposed model is validated comparing experimental and calculated effective electrophoretic mobilities. The results demonstrate that the model can effectively be used to predict effective electrophoretic mobilities of neutral analytes from the determined carbon number equivalents or from octanol-water partition coefficients provided that the solvation parameters of the analytes of interest are similar to those of the reference analytes.
Huhn
Carolin
C
University of Marburg, Department of Chemistry, Hans-Meerwein-Strasse, D-35032 Marburg, Germany.
Pyell
Ute
U
D000814:Aniline Compounds / Q000737:chemistry / Q000302:isolation & purification; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D006571:Heterocyclic Compounds / Q000737:chemistry / Q000302:isolation & purification; D057927:Hydrophobic and Hydrophilic Interactions; D015394:Molecular Structure; D000442:Octanols / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
D000814:Aniline Compounds; D006571:Heterocyclic Compounds; D000442:Octanols; D014867:Water