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Kan X.,Anhui Normal University | Kan X.,The Key Laboratory of Functional Molecular Solids | Kan X.,Anhui Laboratory of Molecule Based Materials | Zhang T.,Anhui Normal University | And 8 more authors.
Biosensors and Bioelectronics | Year: 2016

A dual-signal strategy was developed in the present work for quercetin (QR) electrochemical recognition and detection. Mercapto-β-cyclodextrin (HS-β-CD) self-assembled on gold nanoparticles and multi-walled carbon nanotubes modified electrode surface to fabricate an electrochemical sensor. Scanning electron microscope, electrochemical impedance spectroscopy, and cyclic voltammetry were employed to characterize the preparation process of the sensor. Hydroquinone (HQ) was chosen as an electrochemical marker for QR detection due to its small molecular size for the formation of inclusion with HS-β-CD. The results of UV-vis and differential pulse voltammetry demonstrate that the added QR can replace the included HQ in CD cavities, resulting in the dual-signal in electrochemical experiments composed of the decrease of oxidized current of HQ and the increase of oxidized current of QR. Compared with the sensor for QR detection in the absence of HQ, the sensor based dual-signal strategy exhibited a higher sensitivity with a wider detection range from 5.0×10-9 to 7.0×10-6mol/L. With good selectivity, reproducibility, and stability, the sensor was applied for real samples detection with satisfactory results. The proposed dual-signal strategy can be readily extended to the selective recognition and sensitive detection of other molecules. © 2015 Elsevier B.V.

Teng Y.,Anhui Normal University | Teng Y.,The Key Laboratory of Functional Molecular Solids | Fan L.,Anhui Normal University | Fan L.,The Key Laboratory of Functional Molecular Solids | And 8 more authors.
Biosensors and Bioelectronics | Year: 2015

A new strategy for a composite film based electrochemical sensor was developed in this work. A layer of conductive film of poly(p-aminobenzene sulfonic acid) (pABSA) was electropolymerized onto glassy carbon electrode surface and exhibited a high electrocatalytic active for paracetamol (PR) redox. The subsequent formation of a layer of molecular imprinted polymer (MIP) film on pABSA modified electrode endowed the sensor with plentiful imprinted cavities for PR specific adsorption. The advantages of the composite film made the prepared sensor display high sensitivity and good selectivity for PR detection and recognition. Under the optimal conditions, the sensor could recognize PR from its interferents. A linear ranging from 5.0×10-8 to 1.0×10-4mol/L for PR detection was obtained with a detection limit of 4.3×10-8mol/L. The sensor has been applied to analyze PR in tablets and human urine samples with satisfactory results. The simple, low cost, and efficient strategy reported here can be further used to prepare electrochemical sensors for other compounds recognition and detection. © 2015 Elsevier B.V.

Yu C.,The Key Laboratory of Functional Molecular Solids | Wu Q.,The Key Laboratory of Functional Molecular Solids | Tian Z.,The Key Laboratory of Functional Molecular Solids | Li T.,The Key Laboratory of Functional Molecular Solids | And 2 more authors.
Journal of Porphyrins and Phthalocyanines | Year: 2016

A series of meso-aryloxy linked BODIPY monomers, dimers and trimer were synthesized by nucleophilic aromatic substitution (SNAr) reaction from phenols with meso-chloro BODIPY and their photophysical properties were systematically studied by UV-vis and fluorescence spectroscopy. The relationship between their photophysical properties and the spatial arrangement of meso-aryloxy linked BODIPYs has been discussed. The monomers exhibited different extent solvent-dependent fluorescence, and fluorescence quenching in polar solvents were found relative to the HOMO energies of the donor (meso-phenols), indicating possible PET effect from meso-phenols to the BODIPY fluorophore. Ortho-dimer showed unusual broad red-shifted emission bands centered at 550 nm with a larger Stokes shifts at the range of 2900–3400 cm(Formula presented.), and low fluorescence quantum yields, which was in sharp contrast to those of other dimers and trimer, indicating of possible excimeric species formation due to slipped cofacial arrangement of ortho-dimer. © 2016 World Scientific Publishing Company

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