Xuemei Wang,Yuan Ma,Zheng Zhou,Zhen Zhang,Jie Zhang,Lin Fan,Xinzhen Du,Xiaoquan Lu
Simple and rapid analytical methods for pharmaceuticals and personal care products (PPCPs) are in high demand for environment monitoring. Herein, an in-situ doping strategy was used to ultrarapid synthesize carbon black (CB)-doped Ce (III, IV)-MOF composite with dumbbell-shaped structure at room temperature, which had been used as an electrochemical sensor for the effective and simultaneous detection of typical PPCPs such as dopamine (DA) and acetaminophen (AC) in complex matrices samples using different pulse voltammetry (DPV). Scanning electron microscope (SEM), Nitrogen adsorption-desorption, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and X-ray powder diffractometer (XRD) were used to characterize the morphological and electrochemical properties of synthesized a series material. The mixed-valent CB/Ce (III, IV)-MOF with excellent pore structure properties provided more exposed active sites, which were more conducive to adsorption and thus improved sensing performance. The result showed that the proposed method had a wide linear range (for DA: 0.3–252.0 µM, for AC: 0.3–252.0 µM) and low detection limits (for DA: 0.0955 µM, for AC: 0.1170 µM). Based on the synergistic effect of both CB and Ce (III, IV)-MOF, the composites modified electrodes had excellent electroanalytical capability for DA and AC, which could be used for efficient and rapid monitoring of ECs and the construction of new electrochemical sensor based on MOFs.
Metal–organic frameworks (MOFs) as a new class of porous materials have attracted increasing attention in the field of biomimetic catalysis . This study firstly reports a mixed valence state Ce-MOF possessing intrinsic catalytic activity towards thionine (Thi), and its application in constructing an amplified electrochemical aptasensor for thrombin detection. As noticed, the novel catalytic process combines the advantages of 3D infinite extension of the Ce(III, IV)-MOF skeleton containing large amounts of catalytic sites and spontaneous recycling of the Ce(III)/Ce(IV) for electrochemical reduction of Thi, thereby presenting amplified electrochemical signals. To further improve the aptasensor performance, the high selectivity of proximity binding-induced DNA strand displacement and high efficiency of exonuclease III-assisted recycling amplification were incorporated into the assay. The aptasensor was employed to detect thrombin in complex serum samples, which shows high sensitivity, specificity, stability and reproducibility. This work offers an opportunity to develop MOF-based electrocatalyst as signal-amplifying tag for versatile bioassays and catalytic applications.
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