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-u sing industries, has been achieved using capillary zone electrophoresi s (CZE). The analysis of anionic dyes and some non-coloured anionic in termediates has been achieved using 10 mM Na2B4O7-40 MM sodium dodecyl sulphate (SDS) buffer; high-resolution separations of water soluble a nionic, neutral and cationic intermediates were also achieved using th is micellar buffer. Micellar electrokinetic capillary chromatography ( MECC) has also been developed for the analysis of aqueous insoluble, e lectrically neutral compounds by incorporating a co-solvent, acetonitr ile, into a micellar buffer. In addition, MECC has been used successfu lly for following all the major steps involved in the synthesis of a d isperse dye.