This work established a novel and simple method for quantitative determination of curcumin by developing a “turn-off” fluorescence probe based on upconvert luminescent carbon dots (p-CDs). The carbon dots were synthesized with p-aminobenzoic acid (PABA) and ethanol by solvothermal method and had specific up-conversion luminescence properties which could be applied in other sensing fields. The sensing mechanism of this fluorescent probe was based on the inter filter effect (IFE) between p-CDs and curcumin. As the concentration of curcumin increased, the fluorescence of p-CDs could be selectively quenched. Under the optimal conditions, the fluorescence quenching intensity of p-CDs had a good linear relationship with curcumin in the range of 0.4–45 µΜ and the detection limit was 0.133 µM. In addition, the fluorescent “turn-off” probe constructed with p-CDs exhibited high accuracy and recovery in the analysis of real sample curry powder, indicating that the fluorescence “turn-off” probe had potential application for the detection of curcumin in the complex matrixes.

这项工作通过开发基于上转换发光碳点（p-CD）的“关闭”荧光探针，建立了定量测定姜黄素的新颖，简单的方法。碳点由对氨基苯甲酸（PABA）和乙醇通过溶剂热法合成，具有特定的上转换发光特性，可应用于其他传感领域。该荧光探针的传感机制是基于p-CD与姜黄素之间的互滤效应（IFE）。随着姜黄素浓度的增加，p-CD的荧光可以被选择性地猝灭。在最佳条件下，p-CD的荧光猝灭强度与姜黄素具有良好的线性关系，范围为0.4-45 µM，检出限为0.133 µM。此外，