AUTOMATIC SOLID-PHASE EXTRACTION AND HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHIC DETERMINATION OF QUINIDINE IN PLASMA

High-performance liquid chromatography (HPLC) was used for the therape utic drug monitoring of quinidine in clinical samples. Solid-phase ext raction (SPE) was studied in both off-line and on-line modes. SPE was performed in an automatic on-line mode using a fully automated Prospek t system. Extraction recoveries were in the range 97.1-99.4% for 1-2 m u g/ml quinidine concentrations. For HPLC separation an Ultrasep RP-8 reversed-phase column was applied with acetonitrile-water (9:1) contai ning 0.3% triethylamine (pH 2.5) as the mobile phase. The Prospekt sys tem is recommended for the routine monitoring of quinidine in plasma s amples. Concentrations were in therapeutic range (1.2-3.6 mu g/ml).