CdS QDs：简便合成、设计及作为“开-关”型传感器在食品中灵敏和选择性监测 Cu、Hg 和 Mg 的应用。
CdS QDs: Facile synthesis, design and application as an "on-off" sensor for sensitive and selective monitoring Cu, Hg and Mg in foods.
机构信息
Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, China.
Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, China.
出版信息
Food Chem. 2022 Oct 1;390:133116. doi: 10.1016/j.foodchem.2022.133116. Epub 2022 Apr 29.
A new yellow CdS quantum dots (CdS QDs) with 59% quantum yield were synthesized successfully by one-pot method using thioglycolic acid as stabilizer, thiourea and sodium sulfide as double reducing agents. Based on CdS QDs, a novel "on-off" sensor for detecting Cu, Hg and Mg in foods has been constructed in the presence of glutathione (GSH). The fluorescence intensity of CdS QDs is improved about 1.5-fold by GSH, then quenched linearly by Cu, Hg and Mg owning to the electron transfer or ligand competition. Interestingly, without GSH, CdS QDs has no fluorescence response to Hg at all, and with GSH, linear ranges of Cu and Mg is not only broader, but sensitivities are improved 16.9-fold for Cu and 8.5-fold for Mg. GSH-CdS QDs sensor discloses a more sensitive, efficient and selective methodology for monitoring Cu, Hg and Mg in further heavy metal pollution and food safety.
一种新的黄色 CdS 量子点（CdS QDs），量子产率为 59%，是通过使用巯基乙酸作为稳定剂、硫脲和硫化钠作为双重还原剂的一锅法成功合成的。基于 CdS QDs，在谷胱甘肽（GSH）的存在下，构建了一种用于检测食品中 Cu、Hg 和 Mg 的新型“开-关”传感器。谷胱甘肽使 CdS QDs 的荧光强度提高了约 1.5 倍，然后被 Cu、Hg 和 Mg 线性猝灭，这归因于电子转移或配体竞争。有趣的是，没有 GSH，CdS QDs 对 Hg 根本没有荧光响应，而有 GSH，Cu 和 Mg 的线性范围不仅更宽，而且 Cu 的灵敏度提高了 16.9 倍，Mg 的灵敏度提高了 8.5 倍。GSH-CdS QDs 传感器为进一步的重金属污染和食品安全监测 Cu、Hg 和 Mg 提供了一种更灵敏、高效和选择性的方法。
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