Yong Han,Hui Wang,Ying Yu,Weixia Yang,Fei Shang,Zhonghong Li
Nano-hybrid carbon dots (CDs) with multiple emissions always endure fluorescence quenching induced by the interactions of chemical groups between hybrid CDs and nanomaterial, the samples with abundant interferences by an ordinary pretreatment. Lanthanide ion (DPA-Tb) was employed to hybridize PAN-CDs for the fabrication of ratiometric fluorescent sensor (PAN-CDs&DPA-Tb) to detect Carbendazim (MBC) in complicated food samples with facile pretreatment. The impacts of hybridization on the fluorescence of PAN-CDs were evaluated through dynamic characterizations, which manifested that DPA-Tb and the sensing matrix had no significant influence on the ratiomeric fluorescence of PAN-CDs&DPA-Tb sensor. The sensor (F 363 /F 544 ) linearly responded to concentrations of MBC in 0–0.091 mmol/L with a limit of detection (LOD) of 3.0 × 10 -3 μmol/L and satisfactory applications with recoveries of 92.22–106.08% and RSDs of 0.14–1.69%. The strategy provides a novel sight to investigate the fabrication of CDs-based ratiometric fluorescent sensors.
Yang Dong,Li Xuhua,Li Xiangyu,Chen Jifan,Zhang Ting,Lian Ting,Wang Haihua
Carbendazim (CBD) is widely used as a fungicide that acts as a pesticide in farming to prevent crop diseases. However, CBD can remain on crops for a long time. When consumed by humans and animals, it produces a range of toxic symptoms and poses a serious threat to their health. Therefore, the detection of CBD is necessary. Traditional assay strategies for CBD detection, although sensitive and practical, can hardly achieve fast, robust monitoring during food processing and daily life. Here, we designed a novel electrochemical sensor for CBD detection. In this method, iron oxyhydroxide nanomaterial (β-FeOOH) was first prepared by hydrothermal method. Then, a molecularly imprinted polymer (MIP) layer was electropolymerized on the surface using CBD as the template and resorcinol (RC) as the functional monomer. The synergistic interaction between β-FeOOH and MIP endows the MIP/β-FeOOH/CC-based electrochemical sensor with high specificity and sensitivity. Under optimal conditions, the MIP/β-FeOOH/CC-based sensor showed a wide linear range of 39 pM–80 nM for CBD and a detection limit as low as 25 pM. Therefore, the as-prepared sensor can be a practical and effective tool for pesticide residue detection. Graphical abstract
危险品化学品经营许可证（带存储）