Evaluation of coelectroosmotic capillary zone electrophoresis for the rapid analysis of twelve aromatic sulphonate compounds

Abstract

SummaryCoelectroosmotic capillary zone electrophoresis (CZE) has been investigated as a means of rapid analysis of twelve aromatic sulphonate compounds. The main factors affecting reversal of electroosmotic flow (EOF) -type of osmotic modifier and concentration -were studied. Two types of osmotic modifier, an alkylammoniun salt (cetyltrimethylammonium bromide, CTAB) and a cationic polyelectrolyte (hexadimetrine bromide, HDB) were investigated. The composition of the running buffers was optimized according to the characteristics of each osmotic modifier. A concentration of HDB as low as 0.0001% (w/v) was used successfully to provide a stable and reversed EOF.

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].…”

HPLC determination of chlorobenzenes, benzenesulphonyl chlorides and benzenesulphonic acids in industrial waste water

“…The selectivity of electrophoretic separation of some sulphonated dyes or of the isomers of their intermediates can be improved by adding tetraalkylammonium salts as electroosmotic flow modifiers [21,22] or cyclodextrine selectors [4,23] to the running buffers.…”