CAPILLARY ZONE ELECTROPHORESIS IN THE ANALYSIS OF DYES AND OTHER COMPOUNDS EMPLOYED IN THE DYE-MANUFACTURING AND DYE-USING INDUSTRIES

High-resolution separation of several dyes and related intermediates, as well as other compounds employed in the dye-manufacturing and dye-using industries, has been achieved using capillary zone electrophoresis (CZE). The analysis of anionic dyes and some non-coloured anionic intermediates has been achieved using 10 mM Na2B4O7-40 MM sodium dodecyl sulphate (SDS) buffer; high-resolution separations of water soluble anionic, neutral and cationic intermediates were also achieved using this micellar buffer. Micellar electrokinetic capillary chromatography (MECC) has also been developed for the analysis of aqueous insoluble, electrically neutral compounds by incorporating a co-solvent, acetonitrile, into a micellar buffer. In addition, MECC has been used successfully for following all the major steps involved in the synthesis of a disperse dye.