Electrophoretic determination of phenyl and p-bromophenyl substituted 1H,2H,3H,4H-pyrido[4,3-d]pyrimidinium diiodobromides

Phenyl and p-bromophenyl substituted 1H,2H,3H,4H-pyrido4,3-d]pyrimidinium diiodobromides have been identified and determined by capillary zone electrophoresis on an unmodified quartz capillary. It has been found that an increase in the number of bromine atoms in the structure of 1H,2H,3H,4H-pyrido4,3-d]pyrimidinium derivatives consecutively decreases the electrophoretic mobility of the cations. The developed method makes possible the determination pyrido4,3-d]pyrimidinium derivatives in the concentration range (0.03–0.25) mM with the c _min (3.1–10.0) μM.