High-throughput sequential injection assay method for chlorpromazine

Abstract

This manuscript reports the optimization and validation of a new, rapid, reagent-saving and environmentally-safe method for chlorpromazine assay in pharmaceutical formulations utilizing sequential injection analysis (SIA) technique. Despite its benefits over univariate approach, chemometrics has been rarely exploited for optimizing SIA methods. Moreover, in those methods, some conditions have not been considered in optimization process. In the current study, more conditions, namely volumes and concentrations of reagents, have been optimized by chemometrics for the first time. A developing oxidation reaction of chlorpromazine by permanganate in acidic media was adopted. A spectrophotometric detection of the reduction of permanganate was applied at 526 nm using miniaturized fiber optic devices. The 24 full-factorial design and response surface approaches were exploited for method optimization. The method was validated and realized by a British Pharmacopoeia method. Experimental conditions and analytical aspects of the current SIA method were compared with those of a previous SIA method. Some analytical aspects were comparable while other aspects demonstrated better results from the current method than those from the previous one. The current method is rapid with a sample frequency of 51.4 samples/h. It is also reagent-saving with a total volume of consumed reagents and sample of 260 μL as well as environmental-safety with a total volume of waste production of 1260 μL. The method is therefore efficient for industrial-scale pharmaceutical analysis.