In the food industry, ascorbic acid (AA) is widely used as an antioxidant. However, the concentration of AA is influenced by various factors, including temperature, time, and pH value during food preparation and storage, leading to its instability in content. This makes the accurate detection of AA content particularly important. Precise determination of AA content in food and pharmaceuticals is crucial for ensuring the adequate intake of essential vitamins and maintaining good health. Herein, we have developed a successful preparation method of an imidazole-based ionic liquid functionalized CDs hybrids APM-CDs. A novel photo functional hybrid probe Eu@APM-CDs was obtained via an ion-exchange reaction between APM-CDs and lanthanide complex Eu(DPA). The obtained hybrid probe was extensively characterized in detail. What's more, the results show that the fluorescent intensity of Eu@APM-CDs has a good linear response to AA concentrations in the range of 25–500 μM (R = 0.99), with a detection limit of 80 nM. The fluorescence probe demonstrates good selectivity and sensitivity toward AA and has the potential for significant application in AA detection by simplifying procedures and reducing interference from impurities.

中文翻译：

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用离子液体功能化碳点和稀土配合物灵敏检测橙色样品中的抗坏血酸


在食品工业中，抗坏血酸（AA）被广泛用作抗氧化剂。然而，AA的浓度在食品制备和储存过程中受温度、时间、pH值等多种因素的影响，导致其含量不稳定。这使得AA含量的准确检测显得尤为重要。准确测定食品和药品中的AA含量对于确保摄入足够的必需维生素和保持身体健康至关重要。在此，我们开发了一种基于咪唑的离子液体功能化CDs杂化物APM-CDs的成功制备方法。通过APM-CDs与稀土配合物Eu(DPA)之间的离子交换反应，获得了一种新型光功能杂化探针Eu@APM-CDs。对所获得的杂交探针进行了广泛、详细的表征。更重要的是，结果表明Eu@APM-CDs的荧光强度对AA浓度在25-500 μM范围内具有良好的线性响应（R = 0.99），检测限为80 nM。该荧光探针对AA表现出良好的选择性和灵敏度，通过简化程序和减少杂质干扰，在AA检测中具有重要应用潜力。