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 tb 3+ - 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 tb 3+ 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