School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, Liaocheng University, Liaocheng 252059, China.
State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Tubular Goods Research Institute, Xian 710077, China.
Food Chem. 2022 Mar 15;372:131287. doi: 10.1016/j.foodchem.2021.131287. Epub 2021 Oct 5.
A convenient fluorescence sensor of tetracycline (TC) was constructed based on carbon dots (CDs) and polyvinyl alcohol (PVA) hydrogel film. The immobilization of CDs in PVA carrier can stabilize the fluorescence of CDs by inhibiting the fluorescence quench due to the aggregation of CDs with time. CDs were prepared by a hydrothermal method. CDs showed bright blue fluorescence with the quantum yield of 0.35. The fluorescence of CDs was quenched by TC owing to the inner filter effect. The linear range for TC detection was 0-350 µM and the limit of detection was 0.17 µM. To test conveniently, PVA film was employed to upload CDs. Therefore, a novel sensor for TC was constructed in a visual mode. By comparison with the most of previous works, the present method displayed higher sensitivity and better selectivity. The results suggest that the present sensor has potential applications in the real-time detection of TC in food analysis.
基于碳点（CDs）和聚乙烯醇（PVA）水凝胶薄膜构建了一种简便的四环素（TC）荧光传感器。将 CDs 固定在 PVA 载体中可以通过抑制由于 CDs 的聚集而导致的荧光猝灭来稳定 CDs 的荧光，随着时间的推移。CDs 通过水热法制备。CDs 具有明亮的蓝色荧光，量子产率为 0.35。由于内滤效应，TC 会猝灭 CDs 的荧光。TC 的检测线性范围为 0-350µM，检测限为 0.17µM。为了方便测试，采用 PVA 薄膜上传 CDs。因此，以可视化模式构建了一种新型的 TC 传感器。与之前的大多数工作相比，本方法显示出更高的灵敏度和更好的选择性。结果表明，该传感器在食品分析中实时检测 TC 具有潜在的应用。
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