College of Food Science and Technology, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Zhengzhou 450001, China.
College of Food Science and Technology, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Zhengzhou 450001, China.
Food Chem. 2025 Feb 1;464(Pt 3):141845. doi: 10.1016/j.foodchem.2024.141845. Epub 2024 Oct 29.
Pb has numerous sources in cosmetics, industrial pollution and other environments. Therefore, sensitive and accurate detection of Pb content is extremely important in food safety. In this work, bifunctional nanomaterials TiC@PtPd NPs with fluorescence quenching effect and peroxidase activity were prepared by in situ growth of platinum‑palladium nanoparticles (PtPd NPs) on the surface of 2D material TiC. Combining the DNA enzyme recognition element with magnetic separation technology, we constructed a fluorescence/colorimetric dual-channel for the sensitive detection of Pb. Under the optimal conditions, the detection ranges of this fluorescence/colorimetric bimodal sensing strategy were 0.1-1000 nmol/L and 0.5-1000 nmol/L, respectively. The LOD of the fluorescence method was 23 pmol/L, and that of the colorimetric method was 74 pmol/L, and the results of the detection were visible to the naked eye. This dual-mode sensing method provides a new platform for accurate, reliable and visualized detection of Pb.
铅在化妆品、工业污染和其他环境中存在众多来源。因此，食品安全中对铅含量的灵敏、准确检测极其重要。在这项工作中，通过在二维材料 TiC 表面原位生长铂钯纳米颗粒（PtPd NPs），制备了具有荧光猝灭效应和过氧化物酶活性的双功能纳米材料 TiC@PtPd NPs。我们将 DNA 酶识别元件与磁分离技术相结合，构建了用于灵敏检测 Pb 的荧光/比色双通道。在最佳条件下，该荧光/比色双模传感策略的检测范围分别为 0.1-1000 nmol/L 和 0.5-1000 nmol/L。荧光法的检出限为 23 pmol/L，比色法的检出限为 74 pmol/L，检测结果肉眼可见。这种双模传感方法为 Pb 的准确、可靠和可视化检测提供了新的平台。
