Determination of critical micelle concentrations of anionic surfactants based on ligand exchange micellar electrokinetic chromatography

摘要: Abstract A new method for determining the critical micelle concentration (CMC) of anionic surfactants by ligand exchange-micellar electrokinetic chromatography (LE-MEKC) has been developed. In separation amino acid enantiomers LE-MEKC using a copper complex with l -hydroxyproline as chiral selector, it noted that addition to electrolyte causes reversal enantiomer migration order EMO. The point is correlated CMC. Resolution (Rs) decreases surfactant below CMC and increases above inflection at which Rs equals zero was used calculation Based on this fact, CMCs sodium n -decyl sulphate, dodecyl sulfate -tetradecyl sulphate in 25 mM CuSO 4 , 50 mM pH have determined. presence 2.5% acetonitrile were also Results show increased acetonitrile.