荧光
检出限
黄曲霉毒素
线性范围
化学
量子点
碳纤维
材料科学
生物相容性
核化学
色谱法
纳米技术
食品科学
有机化学
光学
物理
复合材料
复合数
作者
Jianmei Li,Yuting Zhou,Zhijuan Li,Henan Wang,Qi Sun,Tao Le,Rimutu Ji
标识
DOI:10.1016/j.lwt.2023.115130
摘要
Aflatoxin B1 (AFB1) contamination in cereals and their products seriously concerns food safety and human health. Herein, a nitrogen-doped carbon quantum dots (N-CQDs)-based fluorescent sensing platform was successfully developed for the sensitive and rapid detection of AFB1 in corn flour. In this work, using sodium citrate and urea as precursors, hydrophilic N-CQDs were synthesized by the one-step hydrothermal method with good biocompatibility and high fluorescence stability. The as-prepared N-CQDs exhibited excitation wavelength-independent fluorescence in the 300–370 nm range, and had bright blue emission at 448 nm upon 360 nm excitation. Via fluorescence quenching of the N-CQDs in the presence of increasing AFB1 concentrations, the proposed fluorescent sensor had an excellent selectivity for AFB1 detection with a low limit of detection (0.13 ng/mL) in the linear range of 0.5–100 ng/mL. Under optimized sensing conditions, the rapid AFB1 determination in real corn flour samples was realized with good recoveries (95.3–105.7%). In summary, present results indicated the promising potential of this novel N-CQDs-based fluorescent sensor for rapid and effective AFB1 detection in agricultural products.
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