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A novel chemiluminescence (CL) system was evaluated for the determination of hydrogen peroxide, glucose and ascorbic acid based on hydrogen peroxide, which has a catalytic-cooxidative effect on the oxidation of luminol by KIO 4 . Hydrogen peroxide can be directly determined by luminol-KIO 4 -H 2 O 2 CL system. The detection limit was 3.0x10 -8 mol l ...
An electrochemical sensing platform was developed based on the magnetic loading of carbon nanotube (CNT)/nano-Fe 3 O 4 composite on electrodes. To demonstrate the concept, nano-Fe 3 O 4 was deposited by the chemical coprecipitation of Fe 2+ and Fe 3+ in the presence of CNTs in an alkaline solution. The resulting magnetic nanocomposite brings new capabilities...
BiFeO 3 magnetic nanoparticles (BFO MNPs) are used as a catalyst to develop an ultrasensitive method for the determination of H 2 O 2 . It is found that BFO MNPs can catalyze the decomposition of H 2 O 2 to produce OH radicals, which in turn oxidize the weakly fluorescent benzoic acid to a strongly fluorescent hydroxylated product with a maximum emission at...
A simple and facile synthetic method to incorporate Pt nanoparticles inside the mesopores of ordered mesoporous carbons (OMCs) is reported. The Pt/OMCs nanocomposite was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and nitrogen adsorption–desorption. The results show that the incorporation of Pt nanoparticles...
A novel label-free detection system based on CdTe/CdS quantum dots (QDs) was designed for the direct measurement of glucose. Herein we demonstrated that the photoluminescence (PL) of CdTe/CdS QDs was sensitive to hydrogen peroxide (H 2 O 2 ). With d-glucose as a substrate, H 2 O 2 that intensively quenched the QDs PL can be produced via the catalysis of glucose oxidase...
In this paper, we utilized the instinct peroxidase-like property of Fe 3 O 4 magnetic nanoparticles (MNPs) to establish a new fluorometric method for determination of hydrogen peroxide and glucose. In the presence of Fe 3 O 4 MNPs as peroxidase mimetic catalyst, H 2 O 2 was decomposed into radical that could quench the fluorescence of CdTe QDs more efficiently...
In this paper, an enzyme-free amperometric electrochemical sensor was fabricated by casting Nafion-impregnated Cu 2 O particles onto a glassy carbon electrode. A dual dependence of peak current on sweeping rate, which can be attributed for the accumulation of reaction products, was observed on the sensor. Electrochemical analysis of the particulate Cu 2 O for detecting H 2 ...
As a peroxidase mimic, cupric oxide nanoparticles were found to enhance the chemiluminescence (CL) of luminol-H 2 O 2 system up to 400 folds. The CL spectra and radical scavengers were conducted to investigate the possible CL enhancement mechanism. It was suggested that the enhanced CL could be attributed to the peroxidase-like activity of CuO nanoparticles, which effectively catalyzed...
Silver paste electrodes modified with lyotropic phases formed from dodecyl benzenesulphonic acid and KCl were used as the reductant in the determination of the hydrogen peroxide released from the enzymatic reaction of glucose oxidase with glucose and oxygen. The response of the modified electrode to hydrogen peroxide reduction (−0.1V vs. Ag/AgCl) was shown to suffer from interference resulting from...
In this paper, we report a new strategy for detection of hydrogen peroxide and glucose using quantum dot (QD)-based fluorescence resonance energy transfer (FRET) and tyramide reaction. The principle of FRET is based on highly sensitive reaction of a carbocyanine dye (Cy5) labeled tyramide and hydrogen peroxide catalyzed by horseradish peroxidase (HRP), and the fluorescence spectrum of QDs (EX ...
We have demonstrated sensitive detections of hydrogen peroxide (H 2 O 2 ) and glucose using reduced graphene oxide decorated with carbon dots (C-dots@RGO). The C-dots@RGO prepared from catechin (reducing agent and carbon source) and graphene oxide via hydrothermal routes possesses excitation-wavelength-dependence photoluminescence (PL) characteristics, with maximum excitation and emission...
In this paper, we discovered that the anionic polythiophenes derivative, poly[2-(3-thienyl)ethyloxy-4-butylsulfonate] (PTEBS), possesses intrinsic peroxidase-like activity that can catalyze the reaction of peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 to produce a blue color reaction, which provides colorimetric detection of H 2 O ...
Prussian blue nanoparticles (PB NPs) exhibits an intrinsic peroxidase-like catalytic activity towards the hydrogen peroxide (H 2 O 2 )-mediated oxidation of classical peroxidase substrate 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt to produce a colored product. The catalysis follows Michaelis–Menen kinetics and shows strong affinity for H 2 O ...
Enzyme mimetics have recently attracted considerable interest because of their high stability and low cost. We developed a general H 2 O 2 -involved fluorescence system using Fe 3 O 4 magnetic microspheres as peroxidase mimetics and benzoic acid (BA) as indicator. Glucose and p-nitrophenol were used as models to determine the characteristics and effectiveness of the...
This work reports on an experimental investigation of Co9S8 hollow spheres with excellent interfacial charge transfer ability for the electrochemical detection of hydrogen peroxide and glucose in alkaline environment. The result reveals that the Co9S8 hollow spheres exhibit excellent electrocatalytic activity for the reduction of hydrogen peroxide. An electrochemical sensor based on Co9S8 can be further...
In this work, we find that the peroxidase-like activity of MoS2 nanoparticles (NPs) is dependent on the surface charge. Negatively charged sodium dodecyl sulfate modified MoS2 nanoparticles (SDS–MoS2 NPs) possess highly-efficient peroxidase-like activity. MoS2 NPs with intrinsic peroxidase-like activity were synthesized through a simple one-pot hydrothermal route. The peroxidase-like activities of...
In this work, we proposed a dielectric barrier discharge (DBD)-assisted one-pot strategy to fabricate carbon quantum dots (CQDs) using only one reagent N, N-dimethylformamide (DMF) at atmospheric pressure and room temperature. The experimental conditions were carefully investigated, and the prepared CQDs were characterized by using UV–vis spectrophotometer, fluorescence spectrophotometer, Fourier...
Novel electroactive materials with high surface area and stability have great potential for electrochemical sensor. Herein, we demonstrate the exploitation of a porous Cu-based metal-organic framework (Cu-MOF) with large pore size as nonenzymatic sensors for the electrochemical determination of hydrogen peroxide (H2O2) and glucose. The Cu-MOF shows high stability even in NaOH solution. The as-prepared...
In this study, we found that iodophenol blue can enhance the weak chemiluminescence (CL) of luminol–H2O2 system. With the aid of CL spectral, electron spin resonance (ESR) spectral measurements and studies on the effects of various free radical scavengers on the iodophenol blue-enhanced luminol–H2O2 system, we speculated that iodophenol blue may react with H2O2 and oxygen to produce oxidizing radical...
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