IMPROVEMENT OF THE SEPARATION SELECTIVITY IN CAPILLARY ZONE ELECTROPHORESIS OF SYNTHETIC CATIONIC DYES BY POLYVINYLPYRROLIDONE AS PSEUDO-STATIONARY PHASE

Capillary zone electrophoresis is applied to separate under acidic con ditions (pH 3, citric acid/TRIS) five synthetic organic dyes used as c olourants for textiles. These dyes are migrating as cations under the given conditions, but are not fully resolved in this buffer system. 1% Polyvinylpyrrolidone added to the background electrolyte solution and acting as a pseudophase significantly improved the selectivity and en abled full separation of all analytes.