Electrostatic Attachment of Ferrocene Monolayer to a Gold Electrode for Use as Ascorbic Acid Sensor

2012 ◽  
Vol 503-504 ◽  
pp. 1208-1211
Author(s):  
Su Xia Zhang
Keyword(s):  
Ascorbic Acid ◽  
Cyclic Voltammetry ◽  
Gold Electrode ◽  
Fast Response ◽  
Electrochemical Characteristics ◽  
Time Curve ◽  
Current Time ◽  
Electrostatic Assembly ◽  
Simple Preparation ◽  
Ascorbic Acid Sensor

A new ascorbic acid electrochemical sensor was made by electrostatic assembly of ferrocene polymer monolayer on the surface of gold electrode which modified with negatively charged alkanethiol. Cyclic voltammetry and current-time curve were employed to investigate the electrochemical characteristics of the sensor. The ferrocene monolayer modified electrode exhibit excellent electrocatalytic response to the oxidation of ascorbic acid. The anodic overpotential was reduced by about 180 mV compared with that obtained at a bare gold electrode in cyclic voltammetry. Under the optimal conditions, the linear range of the sensor response to ascorbic acid was from 0.05 to 1 mM and the detection limit was 2.710-5 M. The sensor possesses simple preparation, fast response and good electrochemical stability.

Preparation and Electro-Catalytic Performance of Pt-Ag/C as Electro-Reduction Catalysts for H2O2

2012 ◽  
Vol 608-609 ◽  
pp. 870-874
Author(s):  
Zhang Fei Guo ◽  
Dan Zheng
Keyword(s):  
Cyclic Voltammetry ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Catalytic Performance ◽  
Chemical Reduction Method ◽  
Time Curve ◽  
Current Time ◽  
Catalytic Stability ◽  
Nano Catalysts ◽  
Reduction Catalysts

Using impregnation-chemical reduction method, we prepared Pt/C and Pt-Ag/C nano-catalysts. Both of them are with the same platinum content. The composition of the two catalysts was analyzed by XRD technique. The electrochemical performance was studied by cyclic voltammetry and current-time curve. The results show that: the existence of Ag in the Pt-Ag/C catalyst makes Pt crystallinity decreased; compared with Pt/C, Pt-Ag/C has a higher reductive peak current. In addition, both catalysts show the excellent catalytic stability.

scholarly journals Electrochemical Detection of Dopamine at a Gold Electrode Modified with a Polypyrrole–Mesoporous Silica Molecular Sieves (MCM-48) Film

2018 ◽  
Vol 20 (1) ◽  
pp. 111 ◽  
Author(s):  
Izabela Zablocka ◽  
Monika Wysocka-Zolopa ◽  
Krzysztof Winkler
Keyword(s):  
Ascorbic Acid ◽  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Modified Electrode ◽  
Electrochemical Detection ◽  
Molecular Sieves ◽  
Gold Electrode ◽  
Square Wave Voltammetry ◽  
Wave Voltammetry

A gold electrode modified with a polypyrrole–mesoporous silica molecular sieves (polypyrrole—MCM-48) nanostructure film was used for the electrochemical determination of small concentrations of dopamine (DA) by cyclic voltammetry and square-wave voltammetry techniques. This electrode showed good electrocatalytic activity for the oxidation of dopamine. The oxidation potential of dopamine was decreased significantly compared with that obtained at the bare gold electrode. The observed linear range for the determination of the dopamine concentration, without interferents through cyclic voltammetry measurements, was from 10 μM to 1.2 mM (R2 = 0.9989) for the gold electrode modified with the polypyrrole—MCM-48 nanostructure, with a detection limit of 2.5 μM. In the case of square-wave voltammetry, the linear range was 2–250 μM, with a correlation coefficient of 0.9996, and the detection limit was estimated to be 0.7 μM. The effects of interferents, such as ascorbic acid (AA) and uric acid (UA), on the electrochemical detection of dopamine were also examined. The modified electrode can successfully separate the oxidation potentials for ascorbic acid and dopamine, shifting the oxidation peak potential of ascorbic acid to a more positive potential, and significantly decreasing the peak current. The presence of ascorbic acid increased the sensitivity of dopamine determination at the modified electrode, and the detection limit was estimated to be 0.5 μM with 0.1 mM ascorbic acid to imitate physiological solutions. Additionally, studies showed that the presence of uric acid does not affect the electrochemical detection of dopamine. The modified electrode can be successfully applied for the quantitative analysis of dopamine both with and without interferents.

Electrochemical Preparation and Application of PEDOT/Ferrocene Modified Electrode

2015 ◽  
Vol 727-728 ◽  
pp. 61-64 ◽  
Author(s):  
Xin Fei Zhou ◽  
Yan Hui Song ◽  
Kun Yun He ◽  
Hai Tao Zheng ◽  
Shinichiro Suye
Keyword(s):  
Ascorbic Acid ◽  
Cyclic Voltammetry ◽  
Electron Microscope ◽  
Electrochemical Impedance Spectroscopy ◽  
Modified Electrode ◽  
Gold Electrode ◽  
Electrochemical Impedance ◽  
Electrochemical Preparation ◽  
Scanning Electron

A highly stable and sensitive electrochemical sensor was developed by electropolymerisation of poly (3, 4-ethylenedioxythiophene) (PEDOT) and ferrocene (Fc) on gold electrode for the determination of ascorbic acid (AA). The PEDOT/Fc composite film modified Au electrode was characterized by field emission scanning electron microscope，electrochemical impedance spectroscopy and cyclic voltammetry. Compared with bare electrode, the PEDOT/Fc modified electrode exhibited excellent electrocatalytic activity toward the oxidation of AA.

scholarly journals Label-Free Electrochemical Test of Protease Interaction with a Peptide Substrate Modified Gold Electrode

Chemosensors ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 199
Author(s):  
Anna Wcisło ◽  
Izabela Małuch ◽  
Paweł Niedziałkowski ◽  
Tadeusz Ossowski ◽  
Adam Prahl
Keyword(s):  
Gold Electrode ◽  
High Selectivity ◽  
Electrode Materials ◽  
Electrochemical Biosensors ◽  
Electrochemical Characteristics ◽  
Label Free ◽  
Peptide Substrate ◽  
Electrochemical Test ◽  
Experimental Conditions ◽  
Spectrofluorimetric Method

Efficient deposition of biomolecules on the surface, maintaining their full activity and stability, is a most significant factor in biosensor construction. For this reason, more and more research is focused on the development of electrochemical biosensors that have the ability to electrically detect adsorbed molecules on electrode surface with high selectivity and sensitivity. The presented research aims to develop an efficient methodology that allows quantification of processes related to the evaluation of enzyme activity (proprotein convertase) using electrochemical methods. In this study we used impedance spectroscopy to investigate the immobilization of peptide substrate (Arg-Val-Arg-Arg) modified with 11-mercaptoundecanoic acid on the surface of gold electrode. Both the synthesis of the peptide substrate as well as the full electrochemical characteristics of the obtained electrode materials have been described. Experimental conditions, including concentration of peptide substrate immobilization, modification time, linker, and the presence of additional blocking groups have been optimized. The main advantages of the described method is that it makes it possible to observe the peptide substrate–enzyme interaction without the need to use fluorescent labels. This also allows observation of this interaction at a very low concentration. Both of these factors make this new technique competitive with the standard spectrofluorimetric method.

Electrochemical Characteristics of Aptasensor Based on MEMS Thin-Film Gold Electrode

2013 ◽  
Vol 562-565 ◽  
pp. 441-445
Author(s):  
Yan Xia Yan ◽  
Li Ying Jiang ◽  
Fen Fen Wang ◽  
Yan Zhang ◽  
Jie Hu
Keyword(s):  
Thin Film ◽  
Self Assembly ◽  
Gold Electrode ◽  
Ac Impedance ◽  
Optimum Concentration ◽  
Electrochemical Characteristics ◽  
Universal Method

A new fabrication methods of thin-film gold electrode is reported. Electrochemical characteristics of self-assembly aptasensor based on MEMS thin-film gold electrode has been studied by lots of experiments, characteristics include immobilizing time, AC impedance, CV curves. Experiments indicate immobilizing time of DNA-SH on gold electrode is more than 15 hours. CV curves and AC impedance of MEMS thin-film gold electrode show the same conclusion that 20μm/L DNA is optimum concentration when DNA is immobilized on gold electrode. Those results present a potential universal method for other aptasensors.

Electrochemically oriented immobilization of antibody on poly-(2-cyano-ethylpyrrole)-coated gold electrode using a cyclic voltammetry

Talanta ◽  
2011 ◽  
Vol 84 (2) ◽  
pp. 330-334 ◽  
Author(s):  
Hyun-Ju Um ◽  
Mina Kim ◽  
Sang-Hee Lee ◽  
Jiho Min ◽  
Hongik Kim ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Gold Electrode ◽  
Oriented Immobilization

Amperometric sensor for ascorbic acid using a gold electrode modified with ZnO@SiO2 nanospheres

2016 ◽  
Vol 40 (10) ◽  
pp. 8438-8443 ◽  
Author(s):  
Sher Bahadar Khan ◽  
Md Sameer Ahmed ◽  
Abdullah M. Asiri
Keyword(s):  
Ascorbic Acid ◽  
Gold Electrode ◽  
Low Cost ◽  
Amperometric Sensor ◽  
Highly Sensitive ◽  
Sensitive Sensor

A highly sensitive sensor based on ZnO@SiO2 nanospheres has been developed for the detection of ascorbic acid. The developed sensor is very simple and has been fabricated using low cost materials.

A novel poly (vinyl alcohol)-aided ZnO/Fe2O3 nanocomposite as an ascorbic acid sensor

2021 ◽  
Vol 32 (6) ◽  
pp. 7778-7790
Author(s):  
Buzuayehu Abebe ◽  
Enyew Amare Zereffa ◽  
H. C. Ananda Murthy ◽  
C. R. Ravikumar
Keyword(s):  
Ascorbic Acid ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Ascorbic Acid Sensor

scholarly journals Electrochemical characterization and determination of carbamazepine as pharmaceutical standard and tablet content on gold electrode

2014 ◽  
Vol 68 (2) ◽  
pp. 207-212 ◽  
Author(s):  
Nemanja Trisovic ◽  
Bojan Bozic ◽  
Slobodan Petrovic ◽  
Svetlana Tadic ◽  
Milka Avramov-Ivic
Keyword(s):  
Cyclic Voltammetry ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Phosphate Buffer ◽  
Bovine Serum ◽  
Gold Electrode ◽  
Anticonvulsant Drug ◽  
Voltammetric Techniques ◽  
Anodic Behaviour

The anodic behaviour of carbamazepine (CBZ), an anticonvulsant drug, has been studied on gold electrode in 0.1 mol dm-3 phosphate buffer of pH 7.0 by using cyclic voltammetry. It has been found that the value of the oxidative current of pure CBZ at +0.90 V is a linear function of the concentration in a range from 1.0?10-7 to 1.0?10?4 mol dm?3. The detection of CBZ in the concentration of 1.0?10-8 mol dm-3 is among the lowest that have been reported for this drug using voltammetric techniques. CBZ as a content of tablet Galepsine? has been quantitatively determined. It has also been demonstrated that the modification of gold electrode with bovine serum albumin (BSA) results in a decrease of the oxidative peak current due to the binding of the drug to BSA.

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