水相合成了巯基丙酸保护的CdTe量子点。根据在Cu2+存在的情况下，CdTe 量子点荧光恢复程度与依诺沙星浓度成正比的现象，建立了基于CdTe量子点荧光猝灭-恢复测定依诺沙星的新方法。考察了溶液pH 值以及Cu2+ 浓度等对检测体系的影响。在pH=10的硼砂缓冲溶液中，在Cu2+浓度为 2.3×10-5 mol/L的条件下，依诺沙星浓度在8.0×10-7~3.0×10-5 mol/L范围内与量子点荧光恢复程度呈良好的线性关系，检出限为7.2×10-8 mol/L。该方法用于实际样品中依诺沙星的检测，回收率为95.5%~105.0%。

A new type of water-soluble CdTe quantum dot was synthesized by using mercapto propionic acid as the capping ligand for the detection of enoxacin. The fluorescence intensity of CdTe QDs was significantly quenched in the presence of Cu2+. In the presence of enoxacin，the fluorescence of CdTe QDs was recovered because Cu2+ preferred to react with enoxacin. The degree of recovery of CdTe QDs fluorescence intensity was proportional to the enoxacin concentration， which provided a new method for the detection of enoxacin based on the fluorescence quenching-recovery properties of CdTe QDs. In the presence of 2.3×10-5 mol/L Cu2+ in pH=10 borax buffer solution, the recovered fluorescence of CdTe QDs was linearly related with the enoxacin concentration in the range of 8.0×10-7－3.0×10-5 mol/L with a detection limit of 7.2×10-8 mol/L． This method has been successfully applied for the detection of enoxacin in real samples, and the accuracy is within 95.5%－105.0%.