Cm. Knapp et Jj. Breen, EFFECTS OF TETRAALKYLAMMONIUM SALTS ON THE MICELLAR ELECTROKINETIC CHROMATOGRAPHY OF ANILINE AND SUBSTITUTED ANILINES, Journal of chromatography, 799(1-2), 1998, pp. 289-299
Citations number
24
Categorie Soggetti
Chemistry Analytical","Biochemical Research Methods
Experiments investigating the effects of tetraalkylammonium (TAA)ions
on the micellar electrokinetic chromatography (MEKC) of aniline and a
series of 12 substituted anilines using sodium n-dodecyl sulfate (SDS)
are reported. Increasing the concentration of tetramethylammonium (TM
A) ions results in increases in the elution range (t(mc) - t(0)) and t
he migration times for the aniline solutes. In contrast the addition o
f small concentrations of tetrabutylammonium (TEA) ions leads to chang
es in the elution order and a considerable improvement in the separati
on of the anilines without a significant increase in the elution range
. Further increases in the concentration of TEA ions to levels above 1
/3 the concentration of SDS narrows the elution range and has a detrim
ental effect on the separation. The effects of the TEA ions are attrib
uted to changes in the structure of the SDS micelles resulting in a mo
re open and disordered SDS micelle which enhances the transfer of anil
ines with polar ring substituents into the micelle. (C) 1998 Elsevier
Science B.V.