盐酸四环素
荧光
化学
四环素
光化学
盐酸盐
检出限
镧系元素
共轭体系
猝灭(荧光)
苯胺
水溶液
发光
核化学
组合化学
有机化学
聚合物
色谱法
材料科学
抗生素
离子
物理
量子力学
生物化学
光电子学
作者
Pengyue Sun,Diya Yang,Jing Li,Yaodong Zhang
标识
DOI:10.1016/j.dyepig.2021.109841
摘要
In this work, 4-formyl-3-hydroxybenzoic acid (FHBA), which does not contain a large conjugated ring structure, exhibited aggregation-induced emission (AIE) in aqueous solvents. On this basis, FHBA and a metal-organic framework material (i.e., ZIF-8) form into a complex ([email protected]), which presents the AIE characteristics of FHBA. Then, lanthanide metal (i.e., Eu3+) coordinates with guanosine 5′-monophosphate disodium (GMP) salt to synthesize a coordination polymer (LnCP), which combines with [email protected] do afford a novel double-emitting fluorescence probe ([email protected]@Eu-GMP, FZE) for tetracycline antibiotics (TCAs). TCAs coordinate with Eu3+ and act as antenna ligand. Thus, an “antenna effect” comes into being and effectively enhances the emission intensity of Eu3+ at 616 nm. Moreover, the UV–vis spectra of TCAs largely overlap with the excitation spectrum of FHBA, resulting in an inner filter effect (IFE) and quenching of blue-green fluorescence from FHBA molecules at 473 nm. The ratio of fluorescence signal (F616/F473) showed a good linear relationship with the concentration of tetracycline hydrochloride (TC) in the range of 0.1–200.0 μM, and the detection limit was 60 nM (S/N = 3). This fluorescence probe can also effectively respond to oxytetracycline hydrochloride (OTC) and chlortetracycline hydrochloride (CTC). The probe was applied to determine TC in milk, and the recoveries ranged from 94.0% to 101.4%, indicating the application potential of this method. This study provides a novel idea for the construction of ratiometric fluorescence sensing platforms and shows the application potential of the AIE effect of FHBA.
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