Sensitive flow-injection spectrophotometric analysis of bromopride

• The development of simple and inexpensive analytical methods is of growing interest.
• There is a lack of Flow Injection Analysis (FIA) for bromopride analysis.
• The proposed method contributes to the evolution of green analytical chemistry.

A flow injection spectrophotometric procedure employing merging zones is proposed for direct bromopride determination in pharmaceutical formulations and biological fluids. The proposed method is based on the reaction between bromopride and p-dimethylaminocinnamaldehyde (p-DAC) in acid medium, in the presence of sodium dodecyl sulfate (SDS), resulting in formation of a violet product (λmax = 565 nm). Experimental design methodologies were used to optimize the experimental conditions. The Beer–Lambert law was obeyed in a bromopride concentration range of 3.63 × 10−7 to 2.90 × 10−5 mol L−1, with a correlation coefficient (r) of 0.9999. The limits of detection and quantification were 1.07 × 10−7 and 3.57 × 10−7 mol L−1, respectively. The proposed method was successfully applied to the determination of bromopride in pharmaceuticals and human urine, and recoveries of the drug from these media were in the ranges 99.6–101.2% and 98.6–102.1%, respectively. This new flow injection procedure does not require any sample pretreatment steps.

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