纳米探针
荧光
化学
检出限
量子点
猝灭(荧光)
硫化镉
呋喃唑酮
氢键
分析化学(期刊)
光化学
核化学
材料科学
无机化学
纳米技术
色谱法
分子
有机化学
量子力学
物理
生物化学
抗生素
作者
Jia Liu,Bin Yang,Yuting Wang,Fengming Zhang,Xin Liu,Shuli Niu,Yuan Yue,Shuyun Bi
标识
DOI:10.1016/j.microc.2023.109773
摘要
Cadmium sulfide quantum dots (CdS QDs) were synthesized with 3-mercaptopropionic acid (MPA) as protective agent, which were characterized by TEM, UV–vis, fluorescence, XRD and TGA. Based on the fluorescence quenching of 3-MPA-CdS QDs, the indirect methods for the determination of furazolidone (FZD) and nitrofurantoin (NFT) were established. The interaction between FZD/NFT and CdS QDs was investigated by using fluorescence, resonance light scattering, UV–vis and FT-IR. The analyses of Stern-Volmer and fluorescence lifetime indicated that the two quenching systems were all static. The binding constant (Ka) of FZD/NFT-CdS QDs was 1.20 × 104/1.81 × 104 L/mol at 293 K, respectively. Hydrogen bond or van der Waals force was the main binding force between CdS QDs and drugs. Under optimum experimental conditions, the concentration of FZD/NFT was respectively highly correlated with the fluorescence intensity ratio in the range of 0.27 – 36.03/0.57 – 28.58 μg mL−1. The interference experiments showed that the methods had good selectivity. The limit of detection (LOD) for FZD/NFT was 0.02/0.01 μg mL−1. The contents of FZD and NFT in fish samples were determined, and the recoveries were 97.41–99.52 % and 96.64–100.49 %, respectively.
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