Electroanalysis and Simultaneous Determination of 6-Thioguanine in the Presence of Uric Acid and Folic Acid Using a Modified Carbon Nanotube Paste Electrode

Beitollahi, Hadi; Raoof, Jahan Bakhsh; Hosseinzadeh, Rahman

doi:10.2116/analsci.27.991

Cited by 83 publications

(25 citation statements)

References 40 publications

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“…The anodic peak potential of MTX is shifted negatively with the increase of the pH value, indicating reactions accompanied by proton transfer. The slopes of 63.6 mV/pH for MTX oxidation is nearby to the theoretical value of 59 mV/pH and pointed out toward two protons and two electrons involved in the oxidation process [28][29][30]. The detection limit (LOD) was estimated by applying the standard formula of LOD = 3sb/m [31], where m is the slope of the calibration curve and sb is the standard deviation of the peak currents of the blank solution (five replicates).…”

Section: Relationship Between Ph Peak Potential and Peak Current Valuessupporting

confidence: 67%

Surfactant modified carbon nanotube paste electrode for the sensitive determination of mitoxantrone anticancer drug

Manjunatha

2017

J. Electrochem. Sci. Eng.

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Section: Relationship Between Ph Peak Potential and Peak Current Valuessupporting

confidence: 67%

Surfactant modified carbon nanotube paste electrode for the sensitive determination of mitoxantrone anticancer drug

Manjunatha

2017

J. Electrochem. Sci. Eng.

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“…Thus, some references may be mentioned: for instance, the determination of captopril, thioguanine and levodopa (Beitollahi et al, 2014(Beitollahi et al, , 2011a(Beitollahi et al, , 2011b, L-cysteine with ascorbic acid, (Raoof et al, 2007(Raoof et al, , 2006a(Raoof et al, , 2006b, hydroquinone derivatives (Taleat et al, 2008) and simultaneous determinations of carbidapa (Tajik et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Elaboration of modified poly(Ni II -DHS) films as electrodes by the electropolymerization of Ni(II)-[5,5′-dihydroxysalen] onto indium tin oxide surface and study of their electrocatalytic behavior toward aliphatic alcohols

Ourari

Ketfi

Zerroual

2017

Arabian Journal of Chemistry

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Please cite this article as: A. Ourari, B. Ketfi, L. Zerroual, Elaboration of modified poly(Ni II -DHS) films as electrodes by the electropolymerization of Ni(II)-[5, 5'-dihydroxySalen] onto indium tin oxide surface and study of their electrocatalytic behavior towards aliphatic alcohols, Arabian Journal of Chemistry (2014), doi: http:// dx.Abstract Nickel (II)-DHS Complex was obtained from N,N'-bis(2,5-dihydroxybenzylidene)-1,2-diaminoethane (H 2 DHS) ligand and nickel acetate tetrahydrated in ethanolic solution with stirring under reflux. This complex, dissolved in an alkaline solution, was oxidized to form electroactive films strongly adhered on the ITO (Indium tin oxide) electrode surface. In this alkaline solution, the poly-[Ni II -DHS]/ITO films showed the typical voltammetric response of (Ni 2+ /Ni 3+ ) redox couple centers which are immobilized in the polymer-film. The modified electrodes (MEs) obtained were also characterized by several techniques such as scanning electronic microscopy, atomic force microscopy and electrochemical methods. The electrocatalytic behavior of these MEs towards the oxidation reaction of some aliphatic alcohols such as methanol, ethanol, 2-Methyl-1-propanol and isopropanol was investigated.The voltammograms recorded with these alcohols showed a good electrocatalytic efficiency.The electrocatalytic currents were at least 80 times higher than those obtained for the oxidation of methanol on electrodes modified with nickel hydroxide films in alkaline solutions. We noticed that these electrocatalytic currents are proportional to the concentration of methanol (0.050 to 0.30 µM). In contrast, those recorded for the oxidation of other aliphatic short chain alcohols such as ethanol, 2-Methyl-1-propanol and isopropanol are rather moderately weaker. In all cases the electrocatalytic currents presented a linear dependence with the concentration of alcohol. These modified electrodes could be applied as alcohol sensors.

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“…One of the most important properties of CMEs is their ability to catalyze the electrode process via the significant decrease of overpotential with respect to the unmodified electrode. With respect to the relatively selective interaction of the electron mediator with the target analyte in a coordinated fashion, these electrodes are capable of considerably enhancing the selectivity of electroanalytical methods (Beitollahi et al 2011a;Luo et al 2013;Taleat et al 2008;Huo et al 2013;Thomas et al 2013b;Raoof et al 2006b;Oliveira et al 2013;Beitollahi et al 2011b;Thomas et al 2013c;Mohammadi et al 2013;Sanghavi et al 2013;Beitollahi et al 2014;Li et al 2012;Ghoreishi et al 2012;Yildiz et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Application of a modified graphene nanosheet paste electrode for voltammetric determination of methyldopa in urine and pharmaceutical formulation

et al. 2014

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Background: Electrochemical sensors and biosensors for pharmaceutical, food, agricultural and environmental analyses have been growing rapidly due to electrochemical behavior of drugs and biomolecules and partly due to advances in electrochemical measuring systems. In the present work, we describe the preparation of a new electrode composed of graphen (G) modified with 2,7-bis(ferrocenyl ethyl) fluoren-9-one (2,7-BFGPE) and investigate its performance for the electrocatalytic determination of methyldopa in aqueous solutions. Methods: Experimental section was carried out using cyclic voltammetry, square wave voltammetry and chronoamperometry. Results: Under the optimized conditions (pH 7.0), the square wave voltammetric peak current of methyldopa increased linearly with methyldopa concentration in the ranges of 9.0 × 10 −8 to 5.0 × 10 −4 M. The detection limit was 5.0 × 10 −8 M methyldopa. The diffusion coefficient (D= 9.35 × 10 −6 cm2/s) and electron transfer coefficient (α=0.52) for methyldopa oxidation were also determined.

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Electroanalysis and Simultaneous Determination of 6-Thioguanine in the Presence of Uric Acid and Folic Acid Using a Modified Carbon Nanotube Paste Electrode

Cited by 83 publications

References 40 publications

Surfactant modified carbon nanotube paste electrode for the sensitive determination of mitoxantrone anticancer drug

Surfactant modified carbon nanotube paste electrode for the sensitive determination of mitoxantrone anticancer drug

Elaboration of modified poly(Ni II -DHS) films as electrodes by the electropolymerization of Ni(II)-[5,5′-dihydroxysalen] onto indium tin oxide surface and study of their electrocatalytic behavior toward aliphatic alcohols

Application of a modified graphene nanosheet paste electrode for voltammetric determination of methyldopa in urine and pharmaceutical formulation

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