中文摘要：

基于在pH 2.55的B-R缓冲溶液中,Zn2＋可使硫化镉量子点（CdS）-左氧氟沙星（LVFX）反应体系的荧光强度显著增敏,提出了荧光光度法测定左氧氟沙星的方法。在波长370nm（λex）及508nm（λem）处,所测得的荧光强度与左氧氟沙星的质量浓度在1～40mg.L-1范围内呈线性关系,方法的检出限（3S/N）为0.11mg.L-1。方法用于盐酸左氧氟沙星片剂和胶囊中左氧氟沙星的测定,与高效液相色谱法测定值相符,测定值的相对标准偏差（n=5）均小于3%。

英文摘要：

Based on the sensitizing action of Zn2＋ on the fluorescence emission of the reaction system of levofloxacin（LVFX） and quantum dots of CdS in a B-R buffer solution of pH 2.55,a fluorophotometric method for determination of LVFX was proposed.Linear relationship was found between values of fluorescence intensity and mass concentration of LVFX in the range of 1-40 mg·L-1 as measured at wavelengths of 370 nm（λex） and 508 nm（λem）.Detection limit（3S/N） found was 0.11 mg·L-1.The proposed method was applied to the determination of LVFX in samples of tablets and capsules,giving results in consistency with those obtained by HPLC.Values of RSD（n=5） found were less than 3%.