scholarly journals Electrochemical Determination of Trichloroacetic Acid using Platinum Electrode

2013 ◽  
Vol 9 (2) ◽  
pp. 1933-1942
Author(s):  
M. Khodari ◽  
A. A. Abd-Elrady ◽  
E.M. Rabie ◽  
H.F. Assaf
Keyword(s):  
Trichloroacetic Acid ◽  
Platinum Electrode ◽  
Supporting Electrolyte ◽  
Linear Sweep Voltammetry ◽  
Electrochemical Determination ◽  
Linear Sweep ◽  
Solution Ph ◽  
Optimized Conditions ◽  
Analytical Utility

The electrochemical reduction of Trichloroacetic acid (TCA) on a platinum electrode by cyclic and linear sweep voltammetry was described. The measurements were investigated under optimized conditions. The supporting electrolyte was 0.01 M sodiumnitrate solution (pH 6.0), scan rate 50mV\s and the reached detection and quantification limits was 4x10-6 mol l-1. The obtained result indicated linear increasing of the current with concentration of TCAA between lower and upper detection limits and excellent sensitivity towards TCAA reduction, which demonstrates the analytical utility of platinum electrode. Meanwhile, interference from other ions and substances were examined. The experimental results indicate that the method for the determination of TCAA samples is successful comparing with other methods or techniques.

scholarly journals Voltammetric investigation on interaction of Hyaluronic Acid with crystal violet and its analytical application

2013 ◽  
Vol 9 (2) ◽  
pp. 1900-1910
Author(s):  
WeiLi Zhang ◽  
XueLiang Niu ◽  
Ping Ping Zhang ◽  
Wei Sun
Keyword(s):  
Hyaluronic Acid ◽  
Crystal Violet ◽  
Linear Sweep Voltammetry ◽  
Electrochemical Determination ◽  
Linear Sweep ◽  
Buffer Solution ◽  
Reaction Conditions ◽  
Peak Current ◽  
The Difference ◽  
Optimized Conditions

In this paper, the interaction of hyaluronic acid (HA) with crystal violet (CV) was investigated carefully by linear sweep voltammetry on the dropping mercury working electrode (DME). In pH 5.0 Britton-Robinson (B-R) buffer solution, CV has a sensitive, well-defined second order derivative linear sweep voltammetric reductive wave at –0.85 V (vs. SCE). After adding a certain amount of HA into CV solution, the reductive peak current decreased without any shift of reductive peak potential. Based on the difference in the reductive peak current, a new voltammetric method for the detection of HA was established. The reaction conditions and the electrochemical determination were studied and optimized. Under the optimized conditions, the decrease of peak current showed a good linear relationship with the HA concentration in the range from 10.0 to 40.0 mg/L. The linear regression equation was got as ∆ip″(nA)= 84.07 C–527.86  (mg/L) (n=8, γ=0.997) and the detection limit was calculated as 2.65 mg/L (3σ). This new established method was further used to HA determination in the synthetic samples with satisfactory results and good recovery. The stoichiometry of CV-HA complex was calculated and the binding mechanism was also discussed by the electrochemical data.

scholarly journals A study of the electrochemical behavior of methomyl on a gold electrode in a neutral electrolyte

2009 ◽  
Vol 74 (5) ◽  
pp. 573-579 ◽  
Author(s):  
Andjelka Tomasevic ◽  
Milka Avramov-Ivic ◽  
Slobodan Petrovic ◽  
Mica Jovanovic ◽  
Dusan Mijin
Keyword(s):  
Gold Electrode ◽  
Hplc Analysis ◽  
Linear Sweep Voltammetry ◽  
Electrochemical Determination ◽  
The Other ◽  
Potential Range ◽  
Linear Sweep ◽  
Qualitative And Quantitative ◽  
Neutral Electrolyte

A gold electrode was used for the qualitative and quantitative electrochemical determination of analytical methomyl in a neutral electrolyte (0.050 M NaHCO3) using cyclic linear sweep voltammetry. In the potential range from -800 mV vs. SCE to 1000 mV vs. SCE the analytical methomyl was quantitatively determined in the concentration range 4.0-16 mg L-1. In the potential range from -1300 mV vs. SCE to 1300 mV vs. SCE, methomyl was qualitatively determined by two anodic and four cathodic reactions. Cycling the potential in this range for 150 min caused the degradation of the molecule, which was confirmed by HPLC analysis. On the other hand, technical methomyl exhibited an inhibition of the gold electrode surface due to the impurities.

scholarly journals Linear sweep polarographic determination of nucleic acids using acridine orange as a bioprobe

2007 ◽  
Vol 72 (11) ◽  
pp. 1085-1094 ◽  
Author(s):  
Wei Sun ◽  
Na Zhao ◽  
Xianlong Yuan ◽  
Kui Jiao
Keyword(s):  
Aqueous Solution ◽  
Acridine Orange ◽  
Electrochemical Method ◽  
Electrochemical Determination ◽  
Determination Method ◽  
Linear Regression Equation ◽  
Peak Potential ◽  
Linear Sweep ◽  
Buffer Solution

The interaction of acridine orange (AO) with double-stranded (ds) DNA in aqueous solution was investigated by linear sweep polarography (LSP) on a dropping mercury working electrode (DME). In pH 2.5 Britton-Robinson (B-R) buffer solution, AO had a sensitive linear sweep polarographic reductive peak at -0.89 V (vs. SCE), which could be greatly inhibited by the addition of dsDNA, with a positive shift of the peak potential. Based on the decrease of the reductive peak current, a new quantitative electrochemical determination method for dsDNA was developed with a linear range of 2.0?20.0 mg l-1 and the linear regression equation: ?Ip" (nA) = 111.90 C (mg l-1)+125.32 (n = 9, ? = 0.997). The influences of commonly co-existing substances, such as metal ions, amino acid, etc., on the determination were also investigated. The method is sensitive, rapid and simple with good selectivity. The new proposed method was further applied to the detection of RNA and three synthetic samples containing dsDNA with satisfactory results. The binding number and the equilibrium constant between dsDNA and AO were calculated by an electrochemical method.

Electron Transfer in Electro-Oxidation of Amoxicillin Using Platinum Electrode and Platinum Modified Cobalt Electrodes

2021 ◽  
Vol 874 ◽  
pp. 155-164
Author(s):  
Herlina ◽  
Muhammad Ali Zulfikar ◽  
Buchari
Keyword(s):  
Electron Transfer ◽  
Oxidation Process ◽  
Platinum Electrode ◽  
Linear Sweep Voltammetry ◽  
Pharmaceutical Product ◽  
Electrochemical Methods ◽  
Linear Sweep ◽  
Low Concentrations ◽  
Electro Oxidation ◽  
Continuous Use

Recently, the increased use of antibiotics in the environment has been studied and one of them is amoxicillin. Amoxicillin (AMX) is a pharmaceutical product that can become waste due to the continuous use and released into the ecosystem even at low concentrations. The electro-oxidation process is one of the electrochemical methods used to destruct the existence of antibiotics because the process is relatively fast and inexpensive. Platinum electrode and platinum modified cobalt electrodes are used for amoxicillin electro-oxidation at the pH of 2 - 7. The range of this amoxicillin's pH was achieved by the pKa's values of the amoxicillin and measured using a UV/Vis spectrophotometer. Electron transfer during the amoxicillin electro-oxidation process with these electrodes is measured by linear sweep voltammetry. The results obtained during the electro-oxidation process showed that electron transfer of amoxicillin was 1, with a Nernstian factor of 0.0521 V/pH for platinum electrode and platinum modified cobalt electrodes, Pt/Co(OH)2 and Pt/Co respectively with values of 0.0506 V/pH and 0.0673 V/pH.

Anodic Voltammetric Behavior of Lincomycin and its Electroanalytical Determination in Pharmaceutical Dosage form and Urine at Gold Electrode

2017 ◽  
Vol 231 (5) ◽  
Author(s):  
Jyothi C. Abbar ◽  
Manjunath D. Meti ◽  
Sharanappa T. Nandibewoor
Keyword(s):  
Gold Electrode ◽  
Dosage Form ◽  
Oxidation Process ◽  
Linear Sweep Voltammetry ◽  
Linear Sweep ◽  
Experimental Conditions ◽  
Pharmaceutical Dosage Form ◽  
Antibiotic Drug ◽  
Voltammetric Behavior

AbstractThe anodic voltammetric behavior of an antibiotic drug, lincomycin hydrochloride (LIN) at gold electrode (GE) has been investigated using cyclic and linear sweep voltammetry. The dependence of the current on pH, concentration and scan rate were investigated to optimize the experimental conditions for the determination of lincomycin. The anodic peak was characterized and the process was adsorption-controlled. The number of electrons transferred in the oxidation process was calculated. In the range of 8.0×10

Determination of Rate and Equilibrium Constants for the Reactions between Electron Transfer Mediators and Proteins by Linear Sweep Voltammetry

1997 ◽  
Vol 249 (2) ◽  
pp. 212-218 ◽  
Author(s):  
Vernon D. Parker ◽  
Alisa Roddick ◽  
Lance C. Seefeldt ◽  
Haijiang Wang ◽  
Gang Zheng
Keyword(s):  
Electron Transfer ◽  
Equilibrium Constants ◽  
Linear Sweep Voltammetry ◽  
Linear Sweep

scholarly journals Carbon ceramic electrode incorporated with zeolite ZSM-5 for determination of Piroxicam

2010 ◽  
Vol 8 (1) ◽  
pp. 155-162 ◽  
Author(s):  
Karim Asadpour-Zeynali ◽  
Mir Majidi ◽  
Mitra Zarifi
Keyword(s):  
Modified Electrode ◽  
Pharmaceutical Formulations ◽  
Differential Pulse ◽  
Solution Ph ◽  
Carbon Ceramic Electrode ◽  
Experimental Parameters ◽  
Voltammetric Behavior ◽  
Carbon Ceramic ◽  
Optimized Conditions

AbstractA new chemically modified electrode is constructed based on carbon ceramic electrode incorporated with zeolite ZSM-5. Voltammetric behavior of piroxicam at the carbon ceramic zeolite modified electrode (CCZME) was investigated. The modified electrode exhibited catalytic activity toward the electrooxidation of piroxicam. Experimental parameters such as solution pH, scan rate, concentration of piroxicam and zeolite amount were studied. It has been shown that using the CCZME, piroxicam can be determined by differential pulse voltammetry (DPV) and hydrodynamic amperometry (HA). Under the optimized conditions the calibration plots are linear in the concentration ranges of 0.20–25.00 and 0.20–50.10 μM with limit of detections of 0.65 and 0.29 μM for DPV and HA, respectively. The modified electrode with DPV and HA methods was successfully applied for analysis of piroxicam in pharmaceutical formulations. The results were favorably compared to those obtained by the spiked method. The results of the analysis suggest that the proposed method has promise for the routine determination of piroxicam in the products examined.

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