Preparation of highly crystalline nitrogen-doped carbon dots and their application in sequential fluorescent detection of Fe3+ and ascorbic acid
Preparation of highly crystalline nitrogen-doped carbon dots and their application in sequential fluorescent detection of Fe3+ and ascorbic acid
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DOI：
10.1016/j.foodchem.2020.126935
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发表时间：
2020-10-01
期刊：
影响因子：
8.8
通讯作者：
Wang, Xiangyang
中科院分区：
文献类型：
--
作者：
Lv, Xiamin;Man, Huasheng;Wang, Xiangyang
碳点（cd）是一类新型的碳基荧光纳米材料。本文以可再生前驱体壳聚糖和酒石酸为原料制备了具有高结晶石墨结构的新型n掺杂CDs，并对其进行了表征。制备的CDs作为生物相容性荧光传感器用于Fe3+和AA的序列检测。在多种过渡金属离子中，Fe3+可以选择性猝灭CDs的荧光。进一步加入AA后，由于Fe3+被AA还原为Fe2+， CDs的猝灭荧光得以恢复，可用于AA的荧光测定。在0 ~ 150 μ M的AA浓度范围内建立了良好的线性关系，检测限低至0.02 μ M，并成功实现了该荧光传感方法在食品样品中AA测定中的实际应用，取得了满意的结果。
Carbon dots (CDs) have been a new class of fascinating carbon-based fluorescent nanomaterials. In the present work, new N-doped CDs with highly crystalline graphite structures are prepared from renewable precursors, chitosan and tartaric acid, and are well characterized. The prepared CDs are applied as a biocompatible fluorescent sensor for the sequential detection of Fe3+ and AA. Among various transition metal ions, Fe3+ can selectively quench the fluorescence of CDs. Upon the further addition of AA, the quenched fluorescence of CDs is then restored as Fe3+ is reduced to Fe2+ by AA, which can be utilized for the fluorescent determination of AA. A good linear relationship in the range of 0-150 mu M of AA concentration is established with a low detection limit of 0.02 mu M. Moreover, the practical applications of this fluorescent sensing method in measurement of AA in food samples are successfully realized with satisfactory results.