Zhang Fangmei, Liu Yibing, Ma Pinyi, Tao Shuo, Sun Ying, Wang Xinghua, Song Daqian
College of Chemistry, Jilin University, Qianjin Street 2699, Changchun, 130012, China.
College of Chemistry, Jilin University, Qianjin Street 2699, Changchun, 130012, China.
Talanta. 2019 Nov 1;204:13-19. doi: 10.1016/j.talanta.2019.05.071. Epub 2019 May 18.
In the present study, a novel ratiometric fluorescence probe based on dual-emitting Mn-doped ZnS quantum dots (Mn:ZnS QDs) was established for detection of Pb and methyl parathion (MP). The dual-emitting Mn:ZnS QDs was aqueous synthesised in one pot and played as a ratiometric fluorescence probe for the detection of Pb with high sensitivity. The fluorescence intensity ratio (F/F) of the probe against the concentration of Pb showed a good linear relationship from 10 nM to 60 nM with a detection limit of 0.5 nM. Furthermore, the Mn:ZnS QDs/Pb system was established as a turn-on fluorescence sensing system to quantitative measure the MP concentration. The fluorescence intensity at 450 nm exhibited a good linear relationship in the MP concentration range from 0.19 to 0.95 μM with a detection limit of about 0.02 μM. It also had a satisfying performance in fruit and environmental water samples. Therefore, the prepared Mn:ZnS QDs-based sensor has been established as a ratiometric fluorescence probe and turn-on method for quantitative detection of lead ion and MP, respectively.
在本研究中，基于双发射锰掺杂硫化锌量子点（Mn:ZnS QDs）构建了一种新型比率荧光探针，用于检测铅和甲基对硫磷（MP）。双发射Mn:ZnS QDs通过一锅水相合成法制备，并作为一种高灵敏度检测铅的比率荧光探针。该探针的荧光强度比值（F/F）与铅浓度在10 nM至60 nM范围内呈现良好的线性关系，检测限为0.5 nM。此外，Mn:ZnS QDs/Pb体系被构建为一种荧光增强型传感体系，用于定量测定MP浓度。在MP浓度范围为0.19至0.95 μM时，450 nm处的荧光强度呈现良好的线性关系，检测限约为0.02 μM。该方法在水果和环境水样中也具有令人满意的性能。因此，所制备的基于Mn:ZnS QDs的传感器已分别作为比率荧光探针和荧光增强型方法用于铅离子和MP的定量检测。
