Separation of aromatic sulfonate compounds by coelectroosmotic micellar electrokinetic chromatography

Abstract

SummaryCoelectroosmotic micellar electrokinetic chromatography (coelectroosmotic MEKC) has been investigated for the separation of twelve aromatic sulfonate compounds. The advantage of this method is that it combines the efficient separation characteristic of MEKC and the short analysis time of the coelectroosmotic mode. MEKC was performed with either cetyltrimethylammonium bromide (CTAB) or polyethylene glycol dodecyl ether (Brij 35) surfactants as pseudostationary phases and 2-propanol as organic modifier. The electroosm0tic flow (EOF) was reversed by adding two types of EOF modifier, an alkylammonitro salt (cetyltrimethylammonium bromide, CTAB) or a cationic polyelectrolyte (hexadimetrine bromide, HDB). The surfactant concentration, applied voltage, and temperature were optimized, the influence of 2-propanol on the MEKC resolution of the compounds was studied. The effect of the osmotic modifier on the separation was also investigated.

Polyelectrolyte‐modified short microchannel for cation separation

“…Fast anion separation has been obtained using the coelectroosmotic separation mode on adding a cationic surfactant to the electrolyte that reverses the EOF, so that the anionic solutes electrophoretically migrate in the same direction as EOF [23][24][25]. Here, the same methodology is applied to generate a counter-electroosmotic mode of cation separation in order to decrease the length of the capillary.…”

Recent advances in capillary electrophoresis and capillary electrochromatography of pollutants

“…Aromatic anionic surfactants such as naphthalene and benzene sulfonates have been separated by MEKC with direct UV detection [123][124][125]. The use of buffer modifiers such as CTAB and hexadimethrin bromide [123], Brij 35 in isopropanol [124,125] and Brij 58 [126] has been described.…”

“…The use of buffer modifiers such as CTAB and hexadimethrin bromide [123], Brij 35 in isopropanol [124,125] and Brij 58 [126] has been described. In contrast, linear anionic surfactants such as SDS have been indirectly detected using p-hydroxybenzoic acid in the buffer [127] and ECD [21].…”

Isotachophoretic focusing and mass spectrometry detection as tools for improving the determination of aromatic sulfonates in capillary electrophoresis

“…Aromatic sulfonate (AS) isomers like benzene-(BZS) and naphthalenesulfonates (NS) are widely used in industrial and domestic processes [22][23][24][25][26]. Although they are not very toxic and have no genotoxic or carcinogenic effects, the microbiological persistence of some compounds is a potential environmental risk.…”

“…Although they are not very toxic and have no genotoxic or carcinogenic effects, the microbiological persistence of some compounds is a potential environmental risk. They are usually present at low levels in environmental samples so sensitive and selective electrophoretic methods are required if they are to be detected [3,4,6,18,23,26].…”