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Fluorimetric Determination of Ketorolac in Urine by Stopped-Flow Sequential Injection Analysis

ABSTRACT An automatic fluorescence method was developed for the determination of ketorolac tromethamine. The method is based on the direct oxidation of the analyte by an acidic solution of permanganate, being the resulting fluorescence measured at 227 nm/320 nm (λex/λem). The reaction is carried out online due to the use of the Sequential Injection Analysis methodology. A detection limit of 0.12 µ g mL−1 and a R.S.D. lower than 3% (n = 10) were obtained under optimum conditions. The analyte was satisfactorily determined in pharmaceuticals and urine samples. Recovery experiments were carried out on human urine, with recoveries in the range 92–108%.