Spectrofluorimetric Determination of Doxorubicin in Spiked Serum and Urine Samples

A simple spectrofluorimetric method is described for the determination of doxorubicin (DXR) based on its quenching effect on the fluorescence intensity of Tb3+- deferasirox (DFX) complex as a fluorescent probe. The excitation and emission wavelengths were 328 and 545 nm, respectively. The effects of pH, time, order of addition of reagents, concentrations of Tb3+ and DFX and the buffer volume on the quenched fluorescence intensity were investigated and optimized. In the optimum conditions, the decrease of the fluorescence intensity of the system showed a good linear relationship with the concentration of DXR in the range of 20-1000 μg L-1, with a correlation coefficient 0.998. The detection limit (3s) was 6.1 μg L-1 and the relative standard deviation for four replicate determinations of different concentrations of DXR was in the range of 1.7–4.4%. The procedure was successfully applied to the determination of doxorubicin in urine and serum samples