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1. An Electrochemical Sensor for Prothrombin-Time Test | |||
XIN Lifei,LIU Hong | |||
Chemistry 22 March 2018 | |||
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Abstract:As a new interdisciplinary, blood coagulation and thrombosis, being involved in the development and progression of many diseases, have a prominent clinical significance. Prothrombin time (PT time) is the time when calcium and tissue factor is added into the blood sample until when the blood sample completely clots. Clinically, PT time is an extremely sensitive screening index in coagulation system, it has an irreplaceable influence to patients\' daily medication and related treatments as it can primarily reflect the normality of the extrinsic coagulation. Until recently, most automated coagulation analyzers used in hospitals can detect a variety of samples and projects at the same time with high accuracy. However it could only be operated by the professionals, not to mention the high production and testing costs. For these reasons, the frequency and ease-of-operation of the detection have been limited. In order to develop a real-time and household detection method, paper-chips and POCT technology are mainly utilized in this work. Paper-chips possesses their own advantages, as it can easily reflect the blood clotting process by detecting a change in the conductance of blood during the blood coagulation process. After a series of design, tests and improvements, a chip for PT time testing is fabricated. Using this chip, the PT time of several blood samples are tested, and the testing results confirmed that the further improved chip can complete the measurement and correction of blood PT time test. Compared with conventional coagulation analyzer, paper-chips have several intrinsic advantages such as reduced cost, higher accuracy, and better application in POCT use. We believe that pushing the further experimental products to market could fill the vacancy in the domestic industry. | |||
TO cite this article:XIN Lifei,LIU Hong. An Electrochemical Sensor for Prothrombin-Time Test[OL].[22 March 2018] http://en.paper.edu.cn/en_releasepaper/content/4744019 |
2. Self-protection Electrochemical Sensor Based on Temperature-responsive Polymer | |||
Zhao Pengcheng,Chen Chao,Xie Yixi,Li Chunyan,Fei Junjie | |||
Chemistry 26 April 2017 | |||
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Abstract:This work reports the application of a novel thermo-sensitive polymer PS-PNIPAm-PS in electrochemistry. It was fabricated and modi?ed onto a working electrode to form a self-protection electrochemical sensor. After testing, at low temperatures, it didn't affect the normal measurement of the working electrode; but at high temperatures, it can automatically shrink to form a dense film, to prevent electron transfer, protect the electrode surface is not damaged, increase its service life.This research provides a novel method for electrode protection, high temperature protection of batteries and new sensors production. | |||
TO cite this article:Zhao Pengcheng,Chen Chao,Xie Yixi, et al. Self-protection Electrochemical Sensor Based on Temperature-responsive Polymer[OL].[26 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4729697 |
3. A novel non-enzymatic glucose sensor based on the ultrafine Co3O4 nanocrystals embedded ordered mesoporous carbon | |||
LI Mian,BO Xiangjie,ZHANG Yufan,GUO Liping | |||
Chemistry 22 December 2014 | |||
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Abstract:In this paper, a novel tiny Co3O4 nanocrystals embedded ordered mesoporous carbon (Co3O4-OMC) has been prepared for the first time without using any surfactants, harmful organic reagents or extreme conditions. Structural characterizations reveal that the size-controlled Co3O4 nanocrystals are uniformly dispersed on carbon matrices. Electrochemical measurements reveal that Co3O4-OMC can more efficiently catalyze glucose oxidation and acquire better detection parameters compared with those for the free Co3O4 nanoparticles (NPs) (such as: the large sensitivity (2597.5 μA cm?2 mM?1 between 0 and 0.8 mM and 955.9 μA cm?2 mM?1 between 0.9 and 7.0 mM), fast response time, wide linear range, good stability, and surpassingly selective capability to electroactive molecules or Cl-). Such excellent performances are attributed to the synergistic effect of the following three factors: (1) the high catalytic sites provided by the uniformly dispersed and size-controlled Co3O4 nanocrystals embedded on OMC; (2) the excellent reactant transport efficiency caused by the abundant mesoporous structures of OMC matrix: (3) the improved electron transport in high electron transfer rate (confinement of the Co3O4 NPs in nanoscale spaces ensured intimate contact between Co3O4 nanocrystals and the conducting OMC matrix). The superior catalytic activity and selectivity make Co3O4-OMC very promising for application in direct detection of glucose. | |||
TO cite this article:LI Mian,BO Xiangjie,ZHANG Yufan, et al. A novel non-enzymatic glucose sensor based on the ultrafine Co3O4 nanocrystals embedded ordered mesoporous carbon[OL].[22 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4624125 |
4. Improvement of Loading Behavior of Myoglobin into Weak Polyelectrolyte Layer-by-Layer Films by Acid Treatment: Electrochemical and Electrocatalytical Studies | |||
Sun Peng,Hu Naifei,Liu Hongyun | |||
Chemistry 06 January 2011 | |||
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Abstract:The treatment of {PAH/PAA}n layer-by-layer films with pH 2.5 solutions has a great influence on loading of myoglobin (Mb) from its pH 5.0 buffers into the films, where PAH = poly(allylamine hydrochloride) and PAA = poly(acrylic acid). Without acid treatment, the {PAH/PAA}n films assembled on pyrolytic graphite electrodes are difficult to load or "absorb" Mb from its solution into the films, and the CV response of {PAH/PAA}n-Mb films is very small. However, after {PAH/PAA}n films are immersed in pH 2.5 buffers for only several minutes, the films can load much larger amounts of Mb from its solutions, and the corresponding {PAH/PAA}n-Mb films show good and nearly reversible cyclic voltammetric response with large peak currents. The direct electrochemistry of {PAH/PAA}n-Mb films can also be used to electrochemically catalyze the reduction of oxygen and hydrogen peroxide in solution. Electrochemical impedance spectroscopy and scanning electron microscopy results show that the permeability and porosity of {PAH/PAA}n films are significantly improved after the acid treatment, and thus beneficial for the loading of Mb from its solution. | |||
TO cite this article:Sun Peng,Hu Naifei,Liu Hongyun. Improvement of Loading Behavior of Myoglobin into Weak Polyelectrolyte Layer-by-Layer Films by Acid Treatment: Electrochemical and Electrocatalytical Studies[OL].[ 6 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4404807 |
5. One-Step Electrochemical Deposition of Prussian Blue-Multiwalled Carbon Nanotube Nanocomposite Thin-film | |||
Dan Du,Minghui Wang | |||
Chemistry 11 August 2009 | |||
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Abstract:Prussian blue-multiwalled carbon nanotube-modified gold (PB-MWCNT/Au) electrodes were successfully fabricated using the electrochemical co-deposition method in which the MWCNTs not only act as a carrier of PB, but also as a modifier for a catalytic function. Fourier transform infrared proved that PB assembled on the surface of MWCNTs through electrochemical co-deposition. Scanning electron microscopy images showed that a relatively porous PB-MWCNT film was formed. Cyclic voltammetry and electrochemical impedance spectroscopy revealed that a PB-coated MWCNTs composite film improved electron and ion transfer relative to pure PB films and also exhibited larger electrode-specific capacitance than PB alone. Compared with PB film, the PB-MWCNT composite film showed a larger response current to the reduction of H2O2 because of the synergistic effects between the MWCNTs and PB particles. This fast, sensitive, and efficient sensor for H2O2 was observed with a detection sensitivity of 856 μA mM-1 cm-2, and the linear range spanned the concentration of H2O2 from 1 μM to 5 mM. The detection limit was 23 nM at a signal-to-noise ratio of 3. The method presented here demonstrated the great potential for CNTs and other inorganic or metal nanoparticles for constructing bioelectronic devices and biosensors. | |||
TO cite this article:Dan Du,Minghui Wang. One-Step Electrochemical Deposition of Prussian Blue-Multiwalled Carbon Nanotube Nanocomposite Thin-film [J].J. Mater. Chem.,2010,20(8):1532-1537. |
6. Ferrocenoyl Glutathione Modified Electrodes: Fabrication and Application for Detection of Cadmium Ions | |||
Fan Meiyi,Wang Fangbin,Liu Younian,Wang Jianxiu,Zeng Dongming,Huang Ke-ong | |||
Chemistry 25 December 2006 | |||
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Abstract:In this paper, 1’-cysteaminecarbonyl-1-glutathionecarbonyl-ferrocene (Fc-GSH) (4) was firstly synthesized from ferrocene dicarboxylic acid and reduced glutathione (GSH) with several steps. The products were characterized by IR and 1H-NMR. Then Fc-GSH was immobilized on the surface of gold electrode. Cyclic votammetry (CV) was adapted to investigate the electrochemical properties of this Fc-GSH modified electrode in the cadmium ions aqueous solutions. In the presence of cadmium ions,large anodic shift was observed in the experiment. Moreover this shift was proportion to the concentration of Cd2+ when the concentration of cadmium ions is lower than 20 nM. So the modified electrode was used as probes to detect cadmium ions with the limitation of 0.1 nM by cyclic voltammetry. | |||
TO cite this article:Fan Meiyi,Wang Fangbin,Liu Younian, et al. Ferrocenoyl Glutathione Modified Electrodes: Fabrication and Application for Detection of Cadmium Ions[OL].[25 December 2006] http://en.paper.edu.cn/en_releasepaper/content/10462 |
7. CuO Nanoparticles as an Amperometric Sensor for Cysteine | |||
Hui Yao,Jin-Zhong Xu,Jun-Jie Zhu | |||
Chemistry 20 December 2005 | |||
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Abstract:CuO nanoparticles with an average size of 5nm have been successfully prepared by microwave irradiation. Nanosized CuO has been found to be more electrocatalytical ability than that of the bulk CuO particles, the oxidation current of the cysteine is enlarged on nanosized copper oxide modified carbon paste electrode. The linear relation between this sampling current and the cysteine concentration is over the range of 10 μM –10 mM with a correlation coefficient of 0.998. The detection limit is 6 μM of cysteine when the signal to noise ration is 3. | |||
TO cite this article:Hui Yao,Jin-Zhong Xu,Jun-Jie Zhu. CuO Nanoparticles as an Amperometric Sensor for Cysteine [OL].[20 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4507 |
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