Amperometric determination of NADH based on a poly-Ni(ii)–curcumin composite film modified glassy carbon electrode

2014 ◽  
Vol 6 (18) ◽  
pp. 7496-7501 ◽  
Author(s):  
Xiaoqian Ouyang ◽  
Yaping Ding ◽  
Xi Ba ◽  
Shuqing Gu
Keyword(s):  
Composite Film ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Amperometric Detection ◽  
High Sensitivity ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Amperometric Determination

A poly-Ni(ii)–curcumin composite film modified electrode was prepared for amperometric detection of NADH with high sensitivity.

Self-Assembled Graphene for Determination of Catechol in Wastewater at Modified Glassy Carbon Electrode

2012 ◽  
Vol 161 ◽  
pp. 255-259 ◽  
Author(s):  
Mei Feng Chen ◽  
Xin Ying Ma ◽  
Xia Li
Keyword(s):  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
High Sensitivity ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Modified Glassy Carbon Electrode

Graphene-modified glassy carbon electrode was made by dropping. In phosphate-citric acid buffered saline, the modified electrode was shown to possess an excellent selective electrocatalytical effect on the redox of catechol, and further used to determine catechol in the presence of resorcin and hydroquinone by cyclic voltammetry. The oxidation peak currents Ipa showed a linear relationship with the concentrations (c) of catechol in the range of 2.97×10-7 mol•L-1~9.31×10-6 mol•L-1 and 9.31×10-6 mol•L-1~1.03×10-4 mol•L-1 with a correlation coefficient as follows: Ipa1(A)= -4.10×10-6-2.31c, R=0.Superscript text9971; Ipa2 (A) =-1.50×10-5-0.60c, R=0.9953, respectively, and the detection limit is 2.50×10-8 mol•L-1. The modified electrode is high sensitivity, selectivity, stability, and has been successfulSuperscript textly applied to analyzing catechol in wastewater.

scholarly journals Electrochemical Determination of Trace Pb (II) by The Modified Glassy Carbon Electrode Compositing MultiWalled Carbon Nanotubes-Nafion-Bi Film

2020 ◽  
pp. 1-12
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Anodic Stripping Voltammetry ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Bismuth Film ◽  
Modified Glassy Carbon Electrode

A modified glassy carbon electrode (GCE) compositing multi-walled carbon nanotubes (MWCNTs), Nafion and bismuth film was prepared and applied for the sensitive detection of trace Pb (II). MWCNTs were dispersed into ethanol by ultrasonication in the presence of Nafion and the nanotubes are coated onto the bare GCE. After that, an extra Nafion adhesion agent is added to the electrode. By the in situ plating, a bismuth film was fabricated on the MWCNTs-NA/GCE, making the desired electrode, MWCNTs-NA-Bi/GCE. The modified electrode was characterized by differential pulse anodic stripping voltammetry, scanning electron microscopy, and cyclic voltammetry. A deposition potential of –1.4 V (vs. Ag/AgCl) and a deposition time of 300 s were applied to the working electrode under stirred conditions after optimizing. Nanotubes and Nafion concentrations and pH were carefully optimized to determine trace lead ions by using the electrode as an electrochemical-sensing platform. Nafion effectively increased the stability and adhesivity of the composite film. The MWCNTs-NA-Bi film modified electrode can remarkably increase the anodic peak current of Pb2+. The sensitivity of MWCNTs-NA-Bi/GCE is 4.35 times higher than that of the bare GCE with bismuth film. The prepared electrode showed excellent stability and reproducibility and can be applied for determination of Pb2+ contained wastewater.

Simultaneous determination of TBHQ and BHA on a MWNT-Brij® 35 modified electrode in micellar media

2015 ◽  
Vol 7 (19) ◽  
pp. 8344-8351 ◽  
Author(s):  
Guzel Ziyatdinova ◽  
Karina Os'kina ◽  
Endzhe Ziganshina ◽  
Herman Budnikov
Keyword(s):  
Simultaneous Determination ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Micellar Medium ◽  
Micellar Media ◽  
Modified Glassy Carbon Electrode ◽  
Simultaneous Voltammetric Determination

Simultaneous voltammetric determination of TBHQ and BHA using a MWNT-Brij® 35 modified glassy carbon electrode in Brij® 35 micellar medium.

Electrocatalytic Response and Determination of Noradrenaline in the Presence of L-Ascorbic and Uric Acids with Poly(Eriochrome Black T)-Modified Electrode

2007 ◽  
Vol 72 (9) ◽  
pp. 1177-1188 ◽  
Author(s):  
Xinhua Lin ◽  
Wei Li ◽  
Hong Yao ◽  
Yuanyuan Sun ◽  
Liying Huang ◽  
...  
Keyword(s):  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Dynamic Range ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Eriochrome Black T ◽  
Wide Linear Dynamic Range

A poly(Eriochrome Black T) chemically modified glassy carbon electrode modified with Eriochrome Black T was prepared by cyclic voltammetry. The modified electrode showed an excellent electrocatalytic activity in oxidation of noradrenaline (NA) and could separate its electrochemical responses from those of L-ascorbic acid (AA) and uric acid (UA). Differences of the oxidation peak potentials for NA-AA and UA-NA were about 150 mV. The responses to NA, AA and UA of the modified electrode are relatively independent. Using differential pulse voltammetry, the peak currents of NA at modified glassy carbon electrode increased linearly with the concentration of NA from 0.5 to 100 μmol l-1. The detection limit was 0.2 μmol l-1. With the modified electrode, UA could be selectively determined in the presence of AA. The method showing a wide linear dynamic range and excellent sensitivity was successfully applied to the determination of NA in pharmaceutical injections and various samples.

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