scholarly journals A Novel Electrochemical Method for Protionamide Determination Based on Its Interaction with Alizarin Red S

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Weili Zhang ◽  
Xueliang Niu ◽  
Hua Zhang ◽  
Qingqing Jiang ◽  
Pingping Zhang
Keyword(s):  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Electrochemical Method ◽  
Cyclic Voltammetry Curve ◽  
Alizarin Red S ◽  
Oxidation Peak ◽  
Optimum Conditions ◽  
Peak Potential ◽  
Alizarin Red ◽  
Oxidation Peak Current

The interaction of protionamide with alizarin red S (ARS) and its analytical application were carefully investigated in this contribution. The interaction conditions were carefully studied and optimized by cyclic voltammetry. Under the optimum conditions, the cyclic voltammetry curve of ARS showed an oxidation peak with the peak potential of 0.57 V. After the addition of protionamide to the ARS solution, the peak potential was negatively moved, and meanwhile the oxidation peak current decreased apparently to the concentration of protionamide and then a new method for the protionamide determination was established. The linear equation between the decreasing current (Δip) and protionamide concentration was got as Δip (μA) = 0.01514C(mg/L) −0.01553  (n=9; r=0.991)with the linear range of 10.0~50.0 mg/L, and the detection limit (3σ) was got as 8.25 μg/mL. The effects of coexisting substances on the determination were carefully investigated and the protionamide artificial and tablet samples were detected with satisfactory results.

Nitrite Sensors Based on Gold Particles and Polyaniline Modified Electrodes

2011 ◽  
Vol 239-242 ◽  
pp. 2466-2469
Author(s):  
Yu Cui Hao ◽  
Yan Juan Liu ◽  
Bin Hao
Keyword(s):  
Electrochemical Method ◽  
Electrocatalytic Oxidation ◽  
Modified Electrodes ◽  
High Sensitivity ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Modified Glassy Carbon Electrode ◽  
Gold Particles ◽  
Oxidation Peak Current ◽  
Experimental Parameters

A nitrite sensor based on a gold particles/polyaniline modified glassy carbon electrode (Au/PAni/GCE) was devoped by electrochemical method. The electrocatalytic oxidation of nitrite at Au/PAni/GCE was studied by cyclic voltammetry. The experimental parameters were optimized, and a voltammetric method for determining nitrite was developed. In phosphate buffered solution(PBS) of pH 3.0, the oxidation peak current of nitrite is proportional to the concentration of nitrite over the range of 4.0×10-7～5.0×10-3mol/L with the detection limit of 2.0×10-7mol/L (r=0.9992). The presented methods of determing nitrite exhibited high sensitivity and good reproducibility.

In situ detection of intermediates from the interaction of dissolved sulfide and manganese oxides with a platinum electrode in aqueous systems

2017 ◽  
Vol 14 (3) ◽  
pp. 178 ◽  
Author(s):  
Yao Luo ◽  
Yougang Shen ◽  
Lihu Liu ◽  
Jun Hong ◽  
Guohong Qiu ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Manganese Oxides ◽  
Platinum Electrode ◽  
Aqueous Systems ◽  
Oxidation Peak ◽  
Peak Current ◽  
Oxidation Peak Current ◽  
Dissolved Sulfide ◽  
In Situ Detection

Environmental contextDissolved sulfide results in soil acidification and subsequent contaminant leaching via oxidation processes, usually involving manganese oxides. In this work, redox processes were monitored in situ by cyclic voltammetry and HS– concentrations were semi-quantitatively determined. The method provides qualitative and semi-quantitative assessment for dissolved sulfide and its oxidation intermediates in aqueous systems. AbstractDissolved sulfide can be oxidised by manganese oxides in supergene environments, while the intermediates including S0, S2O32– and SO32– are easily oxidised by oxygen in air, resulting in some experimental errors in conventional analyses. In this work, the electrochemical behaviours of HS–, S2O32– and SO32– on a platinum electrode were studied by cyclic voltammetry and constant potential electrolysis, and in situ detection of the intermediates was conducted in aqueous systems of HS– and manganese oxides. The results showed that HS– was first oxidised to S0, and then transformed to SO42–. The peak current for the oxidation of HS– to S0 had a positive linear correlation with the used starting HS– concentration. S2O32– and SO32– were directly electrochemically oxidised to SO42–. The oxidation current peak potentials at 0, 0.45 and 0.7V were respectively observed for HS–, S2O32– and SO32– at pH 12.0. Cyclic voltammetry was conducted to monitor the redox processes of HS– and manganese oxides. The oxidation peak current of HS– to S0 decreased, and that of S2O32– to SO42– was observed to increase as the reaction proceeded. The rate of the decrease of the oxidation peak current of HS– indicated that the oxidation activity followed the order of birnessite>todorokite>manganite.

Alizarin red S–zinc(ii) fluorescent ensemble for selective detection of hydrogen sulphide and assay with an H2S donor

RSC Advances ◽  
2015 ◽  
Vol 5 (97) ◽  
pp. 79309-79316 ◽  
Author(s):  
Rahul Kaushik ◽  
Pawan Kumar ◽  
Amrita Ghosh ◽  
Neha Gupta ◽  
Davinder Kaur ◽  
...  
Keyword(s):  
Detection Limit ◽  
Hydrogen Sulphide ◽  
Alizarin Red S ◽  
Selective Detection ◽  
Alizarin Red ◽  
Physiological Conditions

A new Alizarin Red S based fluorescent ensemble ARS–Zn(ii) for the selective detection of H2S is reported. It exhibited H2S selectivity and also detected H2S in serum under physiological conditions. The calculated detection limit of H2S was 92 nM.

scholarly journals Poly(alizarin red S) modified glassy carbon electrode for square wave adsorptive stripping voltammetric determination of metronidazole in tablet formulation

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0244115
Author(s):  
Mulugeta Dawit ◽  
Mahilet Turbale ◽  
Amsalu Moges ◽  
Meareg Amare
Keyword(s):  
Reduction Reaction ◽  
Tablet Formulation ◽  
Alizarin Red S ◽  
Current Response ◽  
Potential Candidate ◽  
Peak Potential ◽  
Alizarin Red ◽  
Potential Shift ◽  
Scan Rate

Potentiodynamically fabricated poly(alizarin red s) modified GCE was characterized using CV and EIS techniques. In contrast to the cyclic voltammetric response of the unmodified GCE for metronidazole, an irreversible reduction peak with three-folds of current enhancement and reduced overpotential at the poly(alizarin red s) modified GCE showed the catalytic effect of the modifier towards reduction of metronidazole. While observed peak potential shift with increasing pH (4.0–10.0) indicated the involvement of protons during the reduction of metronidazole, peak potential shift with scan rate (20–300 mV s-1) confirmed the irreversibility of the reduction reaction of metronidazole at the modified GCE. A better correlation for the dependence of peak current on scan rate (r2 = 0.9883) than on square root of scan rate (r2 = 0.9740) supplemented by slope value of 0.38 for plot of log(current) versus log(scan rate) indicated the reduction reaction of metronidazole at the surface of the modified electrode was predominantly adsorption controlled. Under the optimized method and solution parameters, reductive current response of tablet sample showed linear dependence on spiked standard concentration in a wide range (0–125 μM) with excellent determination coefficient r2, LoD and LoQ of 0.9991, 0.38, and 1.25 μM, respectively. Spike recovery of 97.9% and interference recovery of 96.2–97.5% in the presence of 21.28 and 31.92 μM of uric acid and ascorbic acid validated the applicability of the present method for determination of metronidazole in tablet formulation. The metronidazole content of the tested tablet formulation using standard addition method was found to be 97.6% of what is claimed by the tablet manufacturer making the developed method an excellent potential candidate for its applicability to determine metronidazole in real samples with complex matrix.

Electrochemical Behavior and Determination of Rutin at Inlaid Multi-Wall Carbon Nanotubes Modified Graphite Electrode and Reline Ionic Liquids

2013 ◽  
Vol 785-786 ◽  
pp. 527-532 ◽  
Author(s):  
Li Qing Ye ◽  
Yan Zheng ◽  
Li Li Yan ◽  
Yun Tao Gao
Keyword(s):  
Carbon Nanotubes ◽  
Cyclic Voltammetry ◽  
Ionic Liquids ◽  
Electrochemical Behavior ◽  
Graphite Electrode ◽  
Oxidation Peak ◽  
Peak Current ◽  
Multi Wall Carbon Nanotubes ◽  
Oxidation Peak Current

Inlaid multi-wall carbon nanotubes modified graphite electrode (MWCNTs-GE) was fabricated, combined with Reline Ionic Liquids which possess high conductivity and wide electrochemical window, the electrochemical behavior and determination of Rutin was investigated by cyclic voltammetry and differential pulse stripping voltammetry. The result shows that the oxidation peak current of rutin increased obviously at the inlaid multi-wall carbon nanotubes modified graphite lectrode and in the Reline Ionic Liquids compared to that at the bare graphiteelectrode (GE). In phosphate buffer solution (pH=6.3), one pair of redox peak of rutin was obtained by cyclic voltammetry with 0.32 V of Epaand 0.24 V of Epc. The oxidation peak current value was linearly related to the concentration of rutin in the range of 2×10-6~3×10-5mol·L-1and the detection limit was 9.4×10-7mol·L-1. The average RSD of rutin was 4.0%. The average recovery was 100.2%. The inlaid multi-wall carbon nanotubes modified graphite electrode and the Reline Ionic Liquids had the function of electrocatalysis to oxidation of rutin obviously.This method is reliable, fast and convenient, sensitive and can be used for the determination of the content of rutin.

Electrochemical Inspection of the Interaction of Double Strand ds-DNA with Carmine on Nanometer TiO2 Doped Carbon Paste Electrode

2011 ◽  
Vol 287-290 ◽  
pp. 37-42
Author(s):  
Ming Ming Ma ◽  
Zhi Tong ◽  
Jia Biao Yang
Keyword(s):  
Detection Limit ◽  
Carbon Paste Electrode ◽  
Azo Dye ◽  
Electrochemical Method ◽  
Fluorescence Spectra ◽  
Modified Carbon Paste Electrode ◽  
Oxidation Peak ◽  
Carbon Paste ◽  
Fish Sperm ◽  
Paste Electrode

The interaction of the single azo dye, carmine with fish-sperm dsDNA is inspected in pH 3.2 H2SO4with electrochemical method on the surface of nanometer TiO2modified carbon paste electrode. After the addition of dsDNA, the peak currents of oxidation and reduction peaks of carmine decrease with a positive shift of potential, indicating that intercalation interaction between the dye and dsDNA is taken place. This is consistent with fluorescence spectra results. The binding constant and binding ratio is calculated as 4.92×108and 1:2, respectively. Furthermore, the decrease in the oxidation peak currents is found proportional to dsDNA concentration in the range of 21.24-127.44 μg·mL-1 with a detection limit of 16.04 μg•mL-1.

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 Development of an Electrochemical Method for the Measurement of Antioxidant Capacity of Pure Compounds and Natural Substances Extracts

2013 ◽  
Vol 6 ◽  
pp. 46-54
Author(s):  
Touhami Lanez ◽  
Abdelkerim Rebiai
Keyword(s):  
Superoxide Anion ◽  
Electrochemical Method ◽  
Anion Radical ◽  
Oxidation Peak ◽  
Oxidation Peak Current ◽  
Natural Substances ◽  
Reduction Assay ◽  
Total Antioxidant ◽  
Pure Compounds ◽  
Highly Correlated

A new method has been developed to measure total antioxidant activity of antioxidants in foods and natural substances without use of standard antioxidants and without use of calibration curves plotting. It is based on measuring the oxidation peak current of superoxide anion radical electrochemically generated by reduction of commercial molecular oxygen in dimethylformamide. The method has been validated using 7 known standard antioxidants and the results have been compared with those obtained by the DPPH and molybdate ion reduction assays. Measured antioxidant capacities were highly correlated with those obtained using DPPH (r2 = 0.549) and molybdate ion reduction assay (r2 = 0.434).

Study on Pt-SnO2/C Electrode Prepared by Different Content of Nafion for New Direct Ethanol Fuel Cells

2011 ◽  
Vol 399-401 ◽  
pp. 1408-1414
Author(s):  
Hong Jun Ni ◽  
Can Can Lv ◽  
Xu Hong Wang ◽  
Yu Zhu ◽  
Ming Yu Huang
Keyword(s):  
Cyclic Voltammetry ◽  
Oxidation Reaction ◽  
Ethanol Oxidation ◽  
Oxidation Peak ◽  
Ethanol Oxidation Reaction ◽  
Direct Ethanol Fuel Cells ◽  
Peak Current Density ◽  
Oxidation Peak Current ◽  
Loading Amount ◽  
Different Content

A carbon supported Pt-SnO2/C catalyst was prepared by hydrothermal method .The Pt-SnO2/C electrode was prepared by electrostatic spinning. Factors of product in solution, different Nafion loading and different loading of Pt-SnO2/C catalyst were evaluated for their effects on ethanol oxidation reaction (EOR). Electrocatalyst was characterized by SEM,EDS and XRD. At the same time, Electrocatalyst was tested by cyclic voltammetry (CV) , Chronoamperometry, AC impedance at three-electrode under similar conditions to those of the DEFC. The results show that the Nafion loadings was 7.5wt.％, which the loading amount of Pt was 1.5mg•cm-2, the Pt-SnO2/C electrode has the highest activity for ethanol oxidation. Compared to the low potential, the oxidation peak current density was 2 times high obtained.

Sign in / Sign up

Export Citation Format

Share Document