Wang Yongping, Yue Qiaoli, Hu Yingying, Liu Chen, Tao Lixia, Zhang Cong
Department of Chemistry, Liaocheng University Liaocheng 252059 China
RSC Adv. 2019 Dec 4;9(69):40222-40227. doi: 10.1039/c9ra08352a. eCollection 2019 Dec 3.
N-doped carbon dots (NCDs) exhibit bright blue emissions and have been used as viable fluorescent probes in the turn-off fluorometric assay for vanillin detection. NCDs were prepared from glucose and tyrosine using a facile and green synthesis process. The one-pot hydrothermal treatment was used without any strong acid or oxidant. The fluorescence of NCDs (with excitation/emission peaks at 323/416 nm, respectively) can be quenched by vanillin. The quenching mechanism belongs to the dynamic quenching mode due to the molecular collisions of the ground state of vanillin and the excited state of NCDs. This turn-off system could be utilized to quantify vanillin within a linear range of 0.43-264 μM. The limit of detection was 0.10 μM. Moreover, this approach was successfully applied toward the determination of vanillin in food samples.
氮掺杂碳点（NCDs）呈现出明亮的蓝色发射光，并已被用作香草醛检测的关断荧光测定法中可行的荧光探针。NCDs由葡萄糖和酪氨酸通过简便的绿色合成工艺制备而成。采用一锅水热法处理，无需任何强酸或氧化剂。NCDs的荧光（激发/发射峰分别位于323/416nm）可被香草醛猝灭。猝灭机制属于动态猝灭模式，这是由于香草醛基态与NCDs激发态之间的分子碰撞所致。该关断系统可用于在0.43 - 264μM的线性范围内定量香草醛。检测限为0.10μM。此外，该方法已成功应用于食品样品中香草醛的测定。
