PDF(Pubmed)
Abstract：
Silver ions (Ag+) exist widely in various areas of human life, and the food contamination caused by them poses a serious threat to human health. Among the numerous methods used for the detection of Ag+, fluorescence and colorimetric analysis have attracted much attention due to their inherent advantages, such as high sensitivity, simple operation, short time, low cost and visualized detection. In this work, Pd/Pt nanoflowers (NFs) specifically responsive to Ag+ were synthesized in a simple way to oxidize o-phenylenediamine (OPD) into 2,3-diaminophenazine (DAP). The interaction of Ag+ with the surface of Pd/Pt NFs inhibits the catalytic activity of Pd/Pt NFs towards the substrate OPD. A novel dual-channel nanosensor was constructed for the detection of Ag+, using the fluorescence intensity and UV-vis absorption intensity of DAP as output signals. This dual-mode analysis combines their respective advantages to significantly improve the sensitivity and accuracy of Ag+ detection. The results showed that the limit of detection was 5.8 nM for the fluorescence channel and 46.9 nM for the colorimetric channel, respectively. Moreover, the developed platform has been successfully used for the detection of Ag+ in real samples with satisfactory recoveries, which is promising for the application in the point-of-care testing of Ag+ in the field of food safety.
摘要：
银离子(Ag+)广泛存在于人类生活的各个领域,它们造成的食品污染对人类健康构成了严重威胁。在用于检测Ag+的众多方法中，荧光和比色分析因其固有的优势而备受关注,如高灵敏度，操作简单,短时间,低成本和可视化检测。在这项工作中,以简单的方式合成了对Ag特异响应的Pd/Pt纳米花（NFs），以将邻苯二胺（OPD）氧化为2,3-二氨基苯酚（DAP）。Ag与Pd/PtNFs表面的相互作用抑制了Pd/PtNFs对底物OPD的催化活性。构建了一种新型双通道纳米传感器,用于Ag+的检测,以DAP的荧光强度和UV-vis吸收强度作为输出信号。这种双模分析结合了它们各自的优点，显着提高了Ag检测的灵敏度和准确性。结果表明，荧光通道的检测限为5.8nM，比色通道的检测限为46.9nM，分别。此外，开发的平台已成功用于检测实际样品中的Ag+，具有令人满意的回收率，这对于食品安全领域中Ag+的即时检测具有广阔的应用前景。
