Xu Zeyu, Wang Yizhong, Zhang Jiaran, Shi Ce, Yang Xinting
College of Electronic Information and Automation, Tianjin University of Science and Technology, Tianjin 300222, China.
Information Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
Foods. 2021 Nov 11;10(11):2777. doi: 10.3390/foods10112777.
Detection of copper (II) ions (Cu) in water is important for preventing them from entering the human body to preserve human health. Here, a highly sensitive and selective fluorescence probe that uses mercaptopropionic acid (MPA)-capped InP/ZnS quantum dots (MPA-InP/ZnS QDs) was proposed for the detection of trace amounts of Cu in water. The fluorescence of MPA-InP/ZnS QDs can be quenched significantly in the presence of Cu, and the fluorescence intensity shows excellent linearity when the concentration of Cu varies from 0-1000 nM; this probe also exhibits an extremely low limit of detection of 0.22 nM. Furthermore, a possible fluorescence-quenching mechanism was proposed. The MPA-InP/ZnS QDs probes were further applied to the detection of trace Cu in real water samples and drink samples, showing good feasibility.
检测水中的铜（II）离子（Cu）对于防止其进入人体以维护人类健康至关重要。在此，提出了一种使用巯基丙酸（MPA）包覆的InP/ZnS量子点（MPA-InP/ZnS QDs）的高灵敏度和选择性荧光探针，用于检测水中痕量的Cu。在Cu存在下，MPA-InP/ZnS QDs的荧光会显著猝灭，当Cu浓度在0 - 1000 nM范围内变化时，荧光强度呈现出良好的线性关系；该探针还具有极低的检测限，为0.22 nM。此外，还提出了一种可能的荧光猝灭机制。MPA-InP/ZnS QDs探针进一步应用于实际水样和饮料样品中痕量Cu的检测，显示出良好的可行性。
