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A new fluorescent method was developed based on the ulifloxacin-europium(Ⅲ)-sodium dodecylbenzene sulfonate system for the determination of ulifloxacin,the active metabolite of prulifloxacin.Sodium dodecylbenzene sulfonate formed a ternary complex with ulifloxacin-europium(Ⅲ)and significantly enhanced the characteristic fluorescence of europium(Ⅲ).The enhanced fluorescence intensity showed a good linear relationship with the concentration of ulifloxacin in the range of 5.0×10^-8-2.0×10^-6M with a detection limit of 2.0×10^-10 M(3σ).This method is rapid and sensitive,and has been successfully applied to the determination of ulifloxacin in human urine and serum samples.