نتایج جستجو برای: electrocatalytic determination

تعداد نتایج: 255889  

Journal: :iranian journal of analytical chemistry 2015
ghasem karim-nezhad sara pashazadeh

in the present study, silver oxyfluoride modified silver electrode was employed to electrocatalytic oxidation of isoniazid. the process of oxidation and its kinetics were established by using cyclic voltammetry, chronoamperometry and amperometry techniques. the modified electrode shows a stable and linear response in the concentration range of 3×10−4 to 2.1×10−3 mol l-1 with a correlation coeff...

Journal: :Chemical communications 2009
Ming Wen Haiqing Liu Feng Zhang Yuanzheng Zhu Di Liu Yang Tian Qingsheng Wu

Amorphous FeNiPt nanoparticles with tunable length have for the first time been reported to exhibit excellent electrocatalytic performance in the electrochemical determination of thiols.

Journal: :Chemical communications 2009
Hang Wei Jian-Jun Sun Liang Guo Xiao Li Guo-Nan Chen

A heated oxide covered copper electrode (HOCE) was facilely fabricated for the first time, providing a highly enhanced electrocatalytic oxidation, and cost effective and sensitive determination for polyhydroxy compounds such as glucose and shikimic acid.

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1389

fluorescence chemical sensors for the highly sensitive and selective determination of pb2+ , hg2+, co2+ and fe3+ ions in aqueous solutions are described. the ion sensing system was prepared by incorporating lipophilic ligand (l) as a neutral ion-selective fluoroionophore in the plasticized pvc membrane containing sodium tetraphenylborate or potasium tetrakis (p-chlorophenyl) borate as a liphoph...

2012
Fathali Gholami-Orimi Farshad Taleshi Pourya Biparva Hassan Karimi-Maleh Hadi Beitollahi Hamid R. Ebrahimi Mohamad Shamshiri Hasan Bagheri Masoud Fouladgar Ali Taherkhani

We propose chlorpromazine (CHP) as a new mediator for the rapid, sensitive, and highly selective voltammetric determination of homocysteine (Hcy) using multiwall carbon nanotube paste electrode (MWCNTPE). The experimental results showed that the carbon nanotube paste electrode has a highly electrocatalytic activity for the oxidation of Hcy in the presence of CHP as a mediator. Cyclic voltammetr...

Journal: :Bioelectrochemistry 2009
Jean Chrysostome Ndamanisha Liping Guo

This work reports on a novel nonenzymatic amperometric glucose sensor based on the ordered mesoporous carbon (OMC). Amperometric method was used to evaluate the electrocatalytic activity of the OMC modified electrode toward nonenzymatic glucose in alkaline media in presence and absence of chloride ions. The results indicated that OMC showed electrocatalytic activity for the oxidation of glucose...

Journal: :Nanoscale 2012
Kyuju Kwak S Senthil Kumar Dongil Lee

We report here the selective determination of dopamine (DA) using quantum-sized gold nanoparticles coated with charge selective ligands. Glutathione protected gold nanoparticles (GS-Au(25)) were synthesized and immobilized into a sol-gel matrix via thiol linkers. The GS-Au(25) modified sol-gel electrode was found to show excellent electrocatalytic activity towards the oxidation of DA but no act...

2012
Naigui Shang Ajay Kumar Nijuan Sun Surbhi Sharma Pagona Papakonstantinou Meixian Li Ross A. Blackley Wuzong Zhou Lisa S. Karlsson S. Ravi P. Silva

Vertical graphene nanoflake integrated films having a high density of edge planes have been used as an electrochemical platform to systematically investigate the immobilization, electrochemical oxidation kinetics and direct quantitative determination of natural DNA. Consistently, both transmission electron microscopy and atomic force microscopy observations demonstrate the presence of a self-as...

2012
Gamze TAN Gülçin BOLAT Mehmet Ali ONUR Serdar ABACI

The potential application of biochemically modified electrodes was investigated for construction of a drug biosensor. The electrocatalytic response of lidocaine was examined through modified electrodes using the electron transfer ability of hemoglobin (Hb) immobilized on gold film modified with a self-assembled monolayer (SAM) of 3-mercaptopropionic acid (MPA). According to the results of volta...

2006
Kenneth I. Ozoemena

This paper describes the electrocatalytic behaviour of a glassy carbon electrode (GCE) modified with cobalt(II)phthalocyanine (CoPc) complex peripherally tetrasubstituted with cobalt(II)tetraphenylporphyrin (CoTPP) complexes via ether linkages (i.e., CoPc-(CoTPP)4). The features of the immobilised pentamer were interrogated with cyclic voltammetry and electrochemical impedance spectroscopy (EIS...

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