Analysis of perphenazine and fluphenazine by capillary electrophoresis coupled with tris (2,2'-bipyridyl) ruthenium (II) electrochemiluminescence detection.

The coupling of end-column tris (2,2'-bipyridyl) ruthenium (II) electrochemiluminescence (ECL) detection with capillary electrophoresis (CE) was developed for the analysis of two antipsychotic drugs, perphenazine (PPH) and fluphenazine (FPH). The parameters related to CE separation and ECL detection, including the detection potential, the buffer pH value and concentration, the separation voltage, and Ru(bpy)₃(2+) concentration, were investigated in detail. Under optimum conditions, PPH and FPH were well separated and detected within 11 min. The linear ranges were 0.1-5 μM for PPH, and 0.1-7.5 μM for FPH, respectively. The limits of detection of PPH and FPH were 5 and 10 nM (S/N=3). The relative standard deviations (n=3) of the ECL intensity and the migration time were less than 2.5 and 0.65% in a day, and less than 3.4 and 1.7% in different three days. The proposed method was successfully applied to determine PPH and FPH in spiked urine samples with satisfactory results.