scholarly journals Electrochemical Behavior and Determination of Rutin on Modified Carbon Paste Electrodes

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Pavla Macikova ◽  
Vladimir Halouzka ◽  
Jan Hrbac ◽  
Petr Bartak ◽  
Jana Skopalova
Keyword(s):  
Soxhlet Extraction ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Carbon Paste ◽  
Carbon Paste Electrodes ◽  
Pulse Voltammetry ◽  
Paste Electrode ◽  
Pressurized Solvent Extraction ◽  
Modified Carbon Paste Electrodes

The performances of ionic liquid (1-hexyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide, IL/CPE) and iron phthalocyanine (IP/CPE) modified carbon paste electrodes in electroanalytical determinations of rutin were evaluated and compared to the performance of unmodified carbon paste electrode (CPE). Cyclic voltammetry (CV), differential pulse voltammetry (DPV), differential pulse adsorptive stripping voltammetry (DPAdSV), and amperometry were used for rutin analysis. The best current responses of rutin were obtained at pH 4.0 for all tested techniques. IL/CPE electrode was found to perform best with DPAdSV technique, where a detection limit (LOD) as low as 5 nmol L-1of rutin was found. On the other hand, IP/CPE showed itself to be an optimum choice for DPV technique, where LOD of 80 nmol L-1was obtained. Analytical applicability of newly prepared electrodes was demonstrated on determination of rutin in the model samples and the extracts of buckwheat seeds. To find an optimum method for buckwheat seeds extraction, a boiling water extraction (BWE), Soxhlet extraction (SE), pressurized solvent extraction (PSE), and supercritical fluid extraction (SFE) were tested.

Determination of 5-amino-6-nitroquinoline at a carbon paste electrode

2009 ◽  
Vol 74 (10) ◽  
pp. 1477-1488 ◽  
Author(s):  
Lenka Němcová ◽  
Jiří Zima ◽  
Jiří Barek
Keyword(s):  
Differential Pulse Voltammetry ◽  
Electrochemical Detection ◽  
Carbon Paste Electrode ◽  
Mobile Phase ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Carbon Paste ◽  
Pulse Voltammetry ◽  
Paste Electrode

Differential pulse voltammetry, direct current voltammetry, adsorptive stripping voltammetry and HPLC with electrochemical detection were used for the determination of 5-amino-6-nitroquinoline at a carbon paste electrode. The methods are based either on anodic oxidation or cathodic reduction of this substance, whose electrochemical behavior at carbon paste electrode was further studied by cyclic voltammetry. Practical applicability of these methods was demonstrated on the determination of 5-amino-6-nitroquinoline in model samples of drinking and river water. The detection limit was 2.0 × 10–6 mol l–1 for anodic differential pulse voltammetry in a mixture of Britton–Robinson buffer (pH 11)–methanol 1:1 (v/v) and 1.6 × 10–7 mol l–1 for HPLC with electrochemical detection (E = +1.2 V) in a mobile phase Britton–Robinson buffer (pH 7)–methanol 1:9 (v/v).

Determination of chloramphenicol by differential pulse voltammetry at carbon paste electrodes – The use of sodium sulfite for removal of oxygen from electrode surface

2011 ◽  
Vol 76 (5) ◽  
pp. 383-397 ◽  
Author(s):  
Ferenc T. Pastor ◽  
Hana Dejmková ◽  
Jiří Zima ◽  
Jiří Barek
Keyword(s):  
Differential Pulse Voltammetry ◽  
Glassy Carbon ◽  
Sodium Sulfite ◽  
Differential Pulse ◽  
Optimal Conditions ◽  
Carbon Paste ◽  
Tricresyl Phosphate ◽  
Carbon Paste Electrodes ◽  
Pulse Voltammetry

The possibility of determination of chloramphenicol by differential pulse voltammetry at four different carbon paste electrodes, in the full pH range (2–12) of Britton–Robinson (BR) buffer was investigated. Electrodes were prepared by mixing spectroscopic graphite powder or glassy carbon microbeads with mineral oil (Nujol) or tricresyl phosphate. Under optimal conditions (BR buffer pH 12, the electrode prepared from glassy carbon microbeads and tricresyl phosphate), linear calibration graph was obtained only in 10–5 M chloramphenicol concentration range. Determination of lower concentrations of chloramphenicol was complicated by irreproducible peak of oxygen from the carbon paste which overlapped with peak of chloramphenicol. Addition of sodium sulfite removed the oxygen peak without influence on the peak of chloramphenicol. Under optimal conditions (electrode paste made from glassy carbon microbeads, BR buffer pH 10 and 0.5 M sodium sulfite), straight calibration line was obtained in the 10–6 and 10–5 M chloramphenicol concentration range. Limit of determination was 5 × 10–7 mol/l.

scholarly journals Electrocatalytic determination of captopril using a carbon paste electrode modified with N-(ferrocenyl methylidene) fluorene-2-amine and graphene/ZnO nanocomposite

2019 ◽  
Vol 84 (2) ◽  
pp. 175-185 ◽  
Author(s):  
Mohadeseh Safaei ◽  
Hadi Beitollahi ◽  
Masoud Shishehbore ◽  
Somayeh Tajik ◽  
Rahman Hosseinzadeh
Keyword(s):  
Modified Electrode ◽  
Carbon Paste Electrode ◽  
Electrocatalytic Oxidation ◽  
Differential Pulse ◽  
Diagnostic Techniques ◽  
Carbon Paste ◽  
Pulse Voltammetry ◽  
Electrocatalytic Determination ◽  
Paste Electrode

A carbon paste electrode (CPE) was modified with N-(ferrocenylmethylidene) fluorene-2-amine and graphene/ZnO nanocomposite. The electrooxidation of captopril (CAP) at the surface of the modified electrode was studied using electrochemical approaches. The electrochemical study of the modified electrode, as well as its efficiency for the electrocatalytic oxidation of captopril, is described. The electrode was used to study the electrocatalytic oxidation of captopril, by cyclic voltammetry (CV), chronoamperometry (CHA) and differential pulse voltammetry (DPV) as diagnostic techniques. It has been found that the oxidation of captopril at the surface of modified electrode occurs at a potential of about 340 mV less positive than that of an unmodified CPE. DPV of captopril at the electrochemical sensor exhibited two linear dynamic ranges (0.1?100.0 and 100.0?800.0 ?M) with a detection limit (3?) of 0.05 ?M.

Synthesis of Co/TiO2 Nanocomposite and its Use in Construction of a Sensitive and Selective Sensor for Determination of Ciprofloxacin

2013 ◽  
Vol 829 ◽  
pp. 563-567 ◽  
Author(s):  
Mojtaba Shamsipur ◽  
Mohammad Bagher Gholivand ◽  
Sara Dehdashtian ◽  
Mostafa Feyzi ◽  
Fataneh Jafari
Keyword(s):  
Sol Gel ◽  
Differential Pulse ◽  
Gravimetric Analysis ◽  
Carbon Paste ◽  
Ftir Spectrometry ◽  
Pulse Voltammetry ◽  
Optimized Conditions ◽  
Paste Electrode ◽  
Selective Sensor

The Co/TiO2 nanocomposite was synthesized by a modified sol-gel method. The surface structure and composition of nanoparticles were characterized by scanning electron microscopy (SEM), X-ray powder diffraction analysis (XRD), Fourier transform infrared (FTIR) spectrometry, thermal gravimetric analysis (TGA) and N2 physisorption. A carbon paste electrode (CPE) modified with Co/TiO2 nanocomposite was prepared and used for low level determination of antibiotic ciprofloxacin (CF) using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under optimized conditions, the modified electrode exhibited a linear response over the concentration range of 0.1 to 70 μM CF, with a detection limit of 0.03 μM. The proposed sensor was applied to the CF determination in serum and urine samples.

Design and construction of a carbon paste electrode modified with molecularly imprinted polymer-grafted nanocomposites for the determination of thyroxin in biological samples

2020 ◽  
Vol 12 (3) ◽  
pp. 333-344 ◽  
Author(s):  
Leila Mardani ◽  
Mohammad Taghi Vardini ◽  
Moosa Es'haghi ◽  
Ebrahim Ghorbani Kalhor
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Carbon Paste Electrode ◽  
Biological Samples ◽  
Carbon Paste ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Carbon Paste Electrodes ◽  
Paste Electrode ◽  
Modified Carbon Paste Electrodes

In this study, a novel nano-molecularly imprinted polymer was synthesized and used to prepare modified carbon paste electrodes.

Direct Determination of Boscalid in Grape Samples by Differential Pulse Voltammetry using a Carbon Paste Electrode

2021 ◽  
Author(s):  
Priscila Azevedo Liberato ◽  
Leonardo Luiz Luiz Okumura ◽  
Astréa Filomena de Souza Silva ◽  
Herbert Aleixo ◽  
Júnio Gonçalves Silva ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Direct Determination ◽  
Differential Pulse ◽  
Grape Seed ◽  
Carbon Paste ◽  
Vitis Labrusca ◽  
Pulse Voltammetry ◽  
Red Grape ◽  
Paste Electrode

A new methodology to determine direct the fungicide Boscalid (BSC) was developed and successfully applied in red grape 100% juice, peel extracts, pulp and purple grape seed (Vitis labrusca L.)...

Sign in / Sign up

Export Citation Format

Share Document