Highly selective determination of ascorbic acid, dopamine, and uric acid by differential pulse voltammetry using poly(sulfonazo III) modified glassy carbon electrode

Ensafi, Ali A.; Taei, M.; Khayamian, Taghi; Arabzadeh, Abbas

doi:10.1016/j.snb.2010.02.048

Cited by 181 publications

(71 citation statements)

References 31 publications

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“…The modification of bare electrodes is less prone to surface fouling and oxide formation compared to bare electrodes. 5 Different substances and methods have been used to modify electrodes. [5][6][7][8] Recent research into developing new electrode materials is now focused on conductive polymers and nano-sized metal colloids.…”

Section: Introductionmentioning

confidence: 99%

“…5 Different substances and methods have been used to modify electrodes. [5][6][7][8] Recent research into developing new electrode materials is now focused on conductive polymers and nano-sized metal colloids. [7][8][9][10][11][12] They behave as an ensemble of closely spaced, but isolated microelectrodes, and act as an electron relay, thus catalyzing the redox reactions.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of MgFe2O4 Nanoparticles as a Novel Electrochemical Sensor: Application for the Voltammetric Determination of Ciprofloxacin

2012

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A new sensor containing MgFe2O4 nanoparticles in modified multiwall carbon nanotubes (MgFe2O4-MWCNTs) was prepared, and its electrochemical behavior was investigated. MgFe2O4-MWCNTs were used as a voltammetric sensor for the electrocatalytic determination of ciprofloxacin. The synthesized materials were characterized by different methods such as transmission electron microscopy (TEM), X-ray diffraction (XRD), cyclic voltammetry, and electrochemical impedance spectroscopy. The MgFe2O4-MWCNTs electrode showed an oxidation peak potential at around 250 mV. The immobilized composite films facilitate interfacial electron transfer and electrocatalytic activity on the oxidation of ciprofloxacin. The oxidation peak current was dependent on the ciprofloxacin concentration, which was linear over the range of 0.10 -1000 μmol L -1 with a detection limit and quantification limit of 0.01 and 0.08 μmol L -1 , respectively. The relative standard deviation for the determination of 1.0 μmol L -1 ciprofloxacin was 1.1%. The repeatability of the sensor was investigated by preparing nine similar electrodes. The proposed sensor is a selective and fast tool for the determination of ciprofloxacin in tablet, plasma, and urine samples.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of MgFe2O4 Nanoparticles as a Novel Electrochemical Sensor: Application for the Voltammetric Determination of Ciprofloxacin

2012

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“…AA, UA, and DA were detected using a pyrollytic graphite electrode modified in DA solution. 20 The detection limit obtained for UA was 1.4 × 10 −6 M.…”

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confidence: 91%

A new and simple DP polarographic method for the determination of uric acid in serum after elimination of the interference of ascorbic acid and dopamine

Çalişkan¹,

Somer²

2014

Turk J Chem

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Determination of trace amounts of uric acid (UA) in serum is of great importance since its level in serum may show disorders in purine metabolism. With this method, trace amounts of UA in blood serum can be determined by a fast and simple procedure using differential pulse polarography (DPP). The limit of detection was estimated to be 2 × 10−7 M (S/N = 3), lower than that given in previous studies. Among the many electrolytes studied, the best electrolyte condition was found to be 0.05 M phosphate buffer, pH 10-12, in 0.1 M KNO 3 . The peak for UA appeared at about -0.15 V in this medium, which responded well to standard additions and high reproducibility was obtained. The validity of the proposed method was tested in serum samples by spiking known concentrations of UA to serum samples and high recovery was obtained. The interference effect of dopamine (DA) and ascorbic acid (AA) was eliminated simply by the addition of Fe(III), in a very fast and quantitative reaction.The proposed method was successfully applied to the determination of UA in serum using only very small quantities (0.5 mL) of serum. There is no need for long and tedious extraction or separation procedures, or to prepare modified electrodes in order to eliminate the interference by AA and DA.

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“…17 Electrochemical techniques, such as differential pulse voltammetry (DPV) using modified or unmodified electrodes, can be considered for the determinations of pharmaceutical compounds as strong alternatives to the other instrumental methods. [18][19][20][21][22] A powerful preparation method for preconcentration and clean up, liquid three-phase micro extraction (LPME), has been introduced and used in recent years. [23][24][25][26][27] In this method, an analyte of interest is extracted from an aqueous sample (donor solution) through a thin layer of an organic solvent, which is immobilized within the pores of a porous film, and is then back-extracted into an acceptor solution inside the designed extraction cell.…”

Section: Introductionmentioning

confidence: 99%

Polytetrafluorethylene Film-Based Liquid-Three Phase Micro Extraction Coupled with Differential Pulse Voltammetry for The Determination of Atorvastatin Calcium

2013

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In this paper, we describe a new combination method based on polytetrafluorethylene (PTFE) film-based liquid threephase micro extraction coupled with differential pulse voltammetry (DPV) for the micro extraction and quantification of atorvastatin calcium (ATC) at the ultra-trace level. Different factors affecting the liquid-three phases micro extraction of atorvastatin calcium, including organic solvent, pH of the donor and acceptor phases, concentration of salt, extraction time, stirring rate and electrochemical factors, were investigated, and the optimal extraction conditions were established. The final stable signal was achieved after a 50 min extraction time, which was used for analytical applications. An enrichment factor of 21 was achieved, and the relative standard deviation (RSD) of the method was 4.5% (n = 4). Differential pulse voltammetry exhibited two wide linear dynamic ranges of 20.0 -1000.0 pmol L -1 and 0.001 -11.0 μmol L -1 of ATC. The detection limit was found to be 8.1 pmol L -1 ATC. Finally, the proposed method was used as a new combination method for the determination of atorvastatin calcium in real samples, such as human urine and plasma.

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Highly selective determination of ascorbic acid, dopamine, and uric acid by differential pulse voltammetry using poly(sulfonazo III) modified glassy carbon electrode

Cited by 181 publications

References 31 publications

Characterization of MgFe2O4 Nanoparticles as a Novel Electrochemical Sensor: Application for the Voltammetric Determination of Ciprofloxacin

Characterization of MgFe2O4 Nanoparticles as a Novel Electrochemical Sensor: Application for the Voltammetric Determination of Ciprofloxacin

A new and simple DP polarographic method for the determination of uric acid in serum after elimination of the interference of ascorbic acid and dopamine

Polytetrafluorethylene Film-Based Liquid-Three Phase Micro Extraction Coupled with Differential Pulse Voltammetry for The Determination of Atorvastatin Calcium

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