Electrochemical Behavior of Hemin at a C60-γ-Cyclodextrin and Nafion Chemically Modified Electrode

An electrochemical microsensor based on carbon ®ber microelectrode (CFME) chemically modi®ed with the per¯uorinated cationexchange polymer, Na®on and methylviologen (MV) and its application for in vivo voltammetric measurements of oxygen (O 2 ) are described. The microsensor shows a high catalytic activity for the reduction of O 2 with a good reproducibility, high sensitivity and selectivity and signi®cant ability against electrode fouling. The current is linear with the concentration of O 2 in a range from 9.0610 À6 to 2.0610 À4 molyL with a calculated detection limit, at a signal-to-noise ratio of 3 to 1, of 5.0610 À6 molyL and correlation coef®cient of 0.9985. The relative standard deviation for 2.0610 À4 molyL O 2 is 1.7 % (n 12). Some compounds common to biological¯uids such as glucose, ascorbic acid, uric acid, catecholamine, glutamate, glutathione, Mg 2 , Ca 2 , Na , K and Cl À are tested in vitro and show no interferences with the voltammetric responses to O 2 . In vivo performance of the O 2 microsensors is demonstrated by measurements of local changes in O 2 in the brain of anesthetized rat before and during transient ischemia.

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Electrochemical Microsensor for In Vivo Measurements of Oxygen Based on Nafion and Methylviologen Modified Carbon Fiber Microelectrode

Mao¹,

Jin

Song

et al. 1999

Electroanalysis

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Electrocatalytic Reduction and Determination of Dissolved Oxygen at a Poly(nile blue) Modified Electrode

Shen

2001

Electroanalysis

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A novel dissolved oxygen (DO) sensor based on poly(nile blue) modified glassy carbon electrodes is described. The modified electrodes were prepared by electrochemical cyclic sweep between −0.6 and +1.0 V in a nile blue solution. The electrochemical behavior of poly(nile blue) displayed a two‐electron and two‐proton surface‐controlled quasireversible process with a charge transfer coefficient of 0.17 and electron transfer rate constant of 0.37 s−1. The modified electrodes showed an excellent electrocatalytic activity for the reduction of DO at pH 4.8–5.5. The catalytic peak current is linear with DO concentration in the range from 1.3×10−6 to 2.6×10−5 mol/L with a calculated detection limit of 7.8×10−7 mol/L at a signal‐to‐noise rate of 3 and a correlation coefficient of 0.998. The variation coefficient of electrocatalytic current for 10 determinations at 2.6×10−5 mol/L DO concentration was 2.6 %. The voltammetric response of the modified electrodes to O2 reduction showed a Michaelis‐Menten's behavior at higher O2 concentrations. The Km value for the sensor was found to be 0.028 mmol/L. The low Km value demonstrated that poly(nile blue) immobilized at glassy carbon electrodes exhibited a high affinity to dissolved oxygen.

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Electrocatalytic Reduction of Some α-Halogenated Acids at Electrodes Chemically Modified with the C60-(γ-Cyclodextrin)2 Complex and Nafion Films

Gao

et al. 2001

Electroanalysis

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Electrochemical Behavior of Hemin at a C60-γ-Cyclodextrin and Nafion Chemically Modified Electrode

Abstract: Cyclic voltammetry reveals that C 60 -g-cyclodextrin and Nafion CME has a reversible electroreduction wave in an aqueous solution. The electrochemical behavior of hemin at the CME has been investigated.

Cited by 6 publications

References 23 publications

Electrochemical Microsensor for In Vivo Measurements of Oxygen Based on Nafion and Methylviologen Modified Carbon Fiber Microelectrode

Electrochemical Microsensor for In Vivo Measurements of Oxygen Based on Nafion and Methylviologen Modified Carbon Fiber Microelectrode

Electrocatalytic Reduction and Determination of Dissolved Oxygen at a Poly(nile blue) Modified Electrode

Electrocatalytic Reduction of Some α-Halogenated Acids at Electrodes Chemically Modified with the C60-(γ-Cyclodextrin)2 Complex and Nafion Films

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