School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China.
School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
Anal Chim Acta. 2022 Sep 15;1226:340153. doi: 10.1016/j.aca.2022.340153. Epub 2022 Jul 15.
A convenient and intuitive method for detecting trace heavy metal ions is vital for food safety and quality monitoring. Herein, a dual-emission ratiometric fluorescence probe based on Zr-based metal-organic frameworks (Zr-MOF) and silver nanoclusters (AgNCs) was assembled to sensitive and visual detect mercury ions (Hg). The sensor exhibits good sensitivity from 0.010 to 0.5 μg mL with a low detection limit of 1.8 μg L (corresponding to 0.72 μg kg by weight). The proposed method was finally applied to determine Hg in the Porphyra matrix with satisfactory outcomes, the analytical recoveries were in the range of 94.74%-101.1%, indicating the practicability of the developed method. Meanwhile, the smartphone-based colorimetric method was established by capturing the changes in fluorescence colors of the probes exposed to different Hg concentrations, with a quick sample-to-answer monitoring time of 10 min. The fluorescence probe, with these merits of simplicity, rapid response, and high sensitivity, offered a promising means for evaluating the safety of food polluted with Hg.
一种方便直观的痕量重金属离子检测方法对于食品安全和质量监测至关重要。在此，组装了一种基于锆基金属有机框架（Zr-MOF）和银纳米簇（AgNCs）的双发射比率荧光探针，用于灵敏和可视化检测汞离子（Hg）。该传感器在 0.010 至 0.5μg mL 范围内具有良好的灵敏度，检测限低至 1.8μg L（按重量计为 0.72μg kg）。该方法最终应用于紫菜基质中 Hg 的测定，结果令人满意，分析回收率在 94.74%-101.1%范围内，表明该方法具有实用性。同时，通过捕获探针暴露于不同 Hg 浓度下荧光颜色的变化，建立了基于智能手机的比色法，具有快速的样品至答案监测时间 10 分钟。该荧光探针具有简单、快速响应和高灵敏度的优点，为评估受 Hg 污染的食品安全性提供了一种有前途的方法。
