فهرست مطالب

Analytical & Bioanalytical Electrochemistry - Volume:10 Issue: 9, Sep 2018

Analytical & Bioanalytical Electrochemistry
Volume:10 Issue: 9, Sep 2018

  • تاریخ انتشار: 1397/06/20
  • تعداد عناوین: 10
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  • Hadi Beitollahi *, Somayeh Tajik, Shohreh Jahani, Fariba Garkani Najed Pages 1108-1119
    Bisphenol A (BPA) is an effective endocrine-disrupting compound (EDC) that causes adverse effects on human health and environment. This study reported a novel bisphenol A sensor via MnO2 nanorods modified screen printed electrode. The prepared MnO2/SPE presented fast response, high sensitivity and low background current. Differential pulse voltammetry (DPV) was used as an analytical method for the quantitative determination of bisphenol A, and the fabricated electrochemical sensor exhibits a linear response to bisphenol A in the range of 1.0–300.0 μM with the limit of detection (LOD) of 0.5 μM at a signal-to-noise ratio of 3. The prepared MnO2/SPE has been successfully used for detecting bisphenol A in water samples.
    Keywords: Bisphenol A, MnO2 nanorods, Voltammetric Sensor, Screen Printed Electrode, Real Samples
  • Chethan Maheshwarappa Kuskur, Bahaddurghatta Eshwaraswamy Kumara Swamy *, Honnali Jayadevappa, Kuskur Shivakumar Pages 1120-1133
    A sensitive and selective electrochemical method for the determination of Epinephrine using Eosin Y polymer film modified on the surface of carbon paste electrode was developed by using cyclic voltammetric technique. The Eosin Y polymer film modified electrode shows excellent electrocatalytic activity toward the oxidation of Epinephrine in 0.2 M phosphate buffer solution (PBS) of pH 7.0 at the sweep rate of 100 mV/s. The electrochemical parameter like the effect sweep rate and pH were investigated. The limit of detection was found to be 0.03 µM. Simultaneous investigations resulted in excellent potential difference between Epinephrine and Uric acid by using cyclic voltammetric technique and the interference study was carried out using the differential pulse voltammetric technique. This work provides a simple and easy approach to selectively determine EP in the presence of UA. The analytical performance of this biosensor has been evaluated for detection of epinephrine injection in serum as real sample
    Keywords: Epinephrine, Uric acid, Eosin, Cyclic Voltammetry, Electropolymerisation, Carbon Paste Electrode
  • Kamal Yavari, Behrouz Sabour * Pages 1134-1143
    In this research, composite of metal ion doped Fe3O4 nanoparticles/carbon are prepared via cathodic electrochemical synthesis for the first time. The carbon dispersed aqueous solution of iron(III) nitrate, iron(II) chloride and nickel nitrate was used as the deposition electrolyte. The synthesis was done with applying 10 mA cm-2 at RT conditions. The prepared composite were characterized through XRD, IR, SEM and VSM analyses. The particle morphology, carbon content and metal ion doping were verified by SEM observations and energy-dispersive X-ray spectroscopy. XRD and IR data confirmed that the fabricated composite has magnetite crystal structure. The magnetic data of Ms=54.83emu g–1, Mr=0.43 emu g–1 and Hci=9.26 G, obtained by VSM analysis, proved the superparamagnetic nature of the fabricated composite.
    Keywords: Iron oxide, Metal-ion doping, Electrochemical synthesis, Nanocomposite
  • Jyoti T. Bagalkoti, Sharanappa T. Nandibewoor* Pages 1144-1162
    Voltammetric behaviour of Pyridoxine hydrochloride (PHC) at bromocresol purple modified glassy carbon electrode (Poly BCP-GC) in phosphate buffers was used successfully for the analysis of PHC. Morphology of the electrode was characterised by atomic force microscopy. The effects of various parameters on the sensitivity of the method were investigated. Owing to the enhanced area and extraordinary characteristic surface of the electrode, the Poly BCP-modified glassy carbon electrode showed obvious electro-catalytic activity to the oxidation of PHC. The oxidation process was shown to be irreversible over the entire pH range studied (3.0-9.0) and was diffusion controlled. A possible electrooxidation mechanism was proposed. An intense peak was obtained with a pH value of 3.0, scan rate of 100mV/s, initial and final potential values were 0.4 V and 1.3 V. A sensitive linear voltammetric response for PHC was obtained in the concentration range of 2.0×10−8– 8.0×10−8 M and 2.0×10−8–9.0×10−8 M with the detection limits of 6.28×10−9 M and 1.16×10−9 M for square wave voltammetric and differential pulse voltammetric techniques respectively. Analytical applications of this electrode have been studied for the determination of PHC in various pharmaceutical samples, commercial energy drinks and human blood serum. Due to its low detection limit, fast response, low cost and simplicity, this method proves to be advantageous over other methods.
    Keywords: Pyridoxine hydrochloride, Poly bromocresol purple modified glassy carbon electrode, Differential pulse voltammetry , Square wave voltammetry
  • Farideh Mosazadeh *, Sayed Zia Mohammadi, Amir Hossein Sarhadi Pages 1163-1173
    In the present work, a rapid and sensitive method for electrochemical determination of acetaminophen (AC) based on the modified screen printed carbon electrode (MSPCE) developed. Cyclic voltammetry was used to study the electrochemical behavior of AC and its determination was conducted by applying square wave voltammetry (SWV). The MSPCE in comparison with bare SPCE exhibited enhanced electrocatalytic activity toward the oxidation of AC. A single irreversible oxidation peak was observed at potentials of 590 mV and 480 mV on the MSPCE and bare SPCE, respectively. Based on the results, the linear oxidation peak current was 0.5–220 µM and the correlation coefficient was obtained to be 0.9973. According to the three times standard deviation (3Sb) of the blank, the limit of detection was calculated 0.1 µM. The MSPCE was used for quantitative analysis of acetaminophen in AC ampule and AC tablet samples and the results indicate the feasibility of the amperometric method for AC analysis in routine detection.
    Keywords: Acetaminophen determination, Magnetic core shell nanoparticles, Screen-printed carbon electrode
  • Volodymyr V. Tkach, Lyudmyla V. Romaniv, Iryna L. Kukovs’ka, Svitlana M. Lukanova, Igor G. Biryuk, Tetyana B. Sykyryts´ka, Slvio C. de Oliveira, Gleison A. Casagrande, Reza Ojani, Olena I. Aksimentyeva, Petro I. Yagodynets´ Pages 1174-1180
    The theoretical evaluation of the electropolymerization of the pi-conjugated organic compounds has been given. The correspondent mathematical model has been developed and analyzed by means of linear stability theory and bifurcation analysis. It was shown that the presence of the electrochemical cyclization of conjugated compounds gives its strong impact on electropolymerization process, yielding the compounds with the possibility to enter the polymer chain as monomers. The cyclization may also be the cause of the oscillatory and monotonic instability in the system.
    Keywords: Dopamine, Carbazole, Conducting polymers, Electropolymerization, Electrochemical cyclization, Stable steady-state
  • Parviz Norouzi *, Morteza Rezapour Pages 1181-1192
    Here we report an electrochemical synthesis method for the fabrication of Gd doped iron oxide nanoparticles (Gd-IONPs)/PVA core-shell composite. In this method, GdIONPs/PVA composite is electrodeposited in a simple two-electrode system containing stainless steel cathode and graphite anode. The PVA dissolved aqueous solution of iron(III) nitrate, gadolinium chloride and iron(II) chloride (with molar ration of 0.5:0.5:1) was used as the electrolyte. The fabricated Gd-IONPs/PVA composite are characterized through XRD, FT-IR, FE-SEM, DSC-TGA and VSM analyses. The structural analysis by XRD verified the magnetite crystal structure for the prepared sample. Also, the FE-SEM observations and EDAX data established the particle morphology for the deposited Gd-IONPs cores with size of about 25nm and 7.8% doped Gd3+ ions in its composition. The presence of 30% PVA shell on the GD-IONPs cores was established by TG data. Furthermore, the superparamagnetic behavior of the prepared composite was observed through VSM data, where the composite exhibited magnetic values of Ms=25.72 emu g–1, Mr=0.012 emu g–1 and Ce=0.29 Oe.
    Keywords: Iron oxide, Gd doping, Core-shell composite, Nanoparticles, Electrochemical synthesis, Superparamagnetic
  • Abdelouahad Aouniti, Mohamed El Azzouzi, Imene Belfilali, Ismail Khaleel Warad, Hicham Elmsellem, Belkheir Hammouti, Charafeddine Jama, Fouad Bentiss, Abdelkader Zarrouk * Pages 1193-1210
    The effect of N,N’-((methylazanediyl)bis(propane-3,1-diyl))bis(2-hydroxy-1naphthamide) (MPHN) on the corrosion of mild steel in an aqueous solution of 1 M hydrochloric acid was investigated at different temperatures by chemical and electrochemical techniques. The results obtained showed that MPHN could serve as an effective inhibitor for the corrosion of mild steel in hydrochloric acid media. The N,N’((methylazanediyl)bis(propane-3,1-diyl))bis(2-hydroxy-1-naphthamide) (MPHN) exhibited highest inhibition efficiency of 98% at concentration of 10-3 M. Tafel polarization measurements revealed that MPHN effectively suppressed both the anodic and cathodic processes of mild steel corrosion in acid solution and acted as a mixed-type inhibitor. EIS measurements indicated that the addition of the inhibitor increases the charge-transfer resistance (Rct), decreases the double-layer capacitance (Cdl) of the corrosion process, and hence increases inhibition performance. The SEM/UV-Visible analysis was used to corroborate the mechanism of inhibition. Quantum chemical calculations were used to correlate the inhibition ability of MPHN with its electronic structural parameters.
    Keywords: Mild steel, Corrosion inhibition, Weight loss, Electrochemical studies, SEM, UV-Visible, DFT
  • Tahere Kondori, Niloufar Akbarzadeh, Torbati* Pages 1211-1221
    Folate is another form of folic acid, which is known as one of the B vitamins. It is utilized as an additive by women during pregnancy in order to prevent the neural tube defects. The present study reports on the fabrication of electrochemical sensor for the determination of folic acid using Co3O4 nanoparticles. The suitability of Co3O4 nanoparticles as a modifier for the electrocatalytic detection of folic acid in aqueous solution was investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CA) techniques. The fabricated Co3O4 NPs/GCE sensor exhibited sharp and intense peak towards the electro-oxidation of folic acid as compared to bare electrode. The linear calibration plot of folic acid was obtained from 1.0 to 900.0 µM with the detection limit of 0.8 µM. The modified electrode was use for the detection of folic acid in real samples and found to produce satisfactory results.
    Keywords: Folic acid, Co3O4 nanoparticles, Glassy carbon electrode, Voltammetry
  • Shilpa Jain *, Arun Kumar Sharma, Ajay Kumar Goswami Pages 1222-1246
    In view of the fact that hardly any cyclic voltammetric studies for hydroxytriazenes are available in the literature, the present investigation is an attempt to perform the study to understand redox mechanism of hydroxytriazenes based on 2-methyl5-chloroaniline and 2-trifluoromethyl-5-chloroaniline.The present work deals with the electrochemical studies of substituted aniline based hydroxytriazenes in acidic and Basic media using cyclic voltammetry which elucidate the tentative mechanism and products of electrode processes. The studies includes cyclic voltammetric of ten hydroxytriazenes under various condition such as 1×10-4, KCl as supporting electrolyte, BR buffer at varying pH values from 4,7 and 9. The studies indicate that hydroxytriazenes are reducible under given condition and their electrochemical mechanism can lead to understand the mechanism under biological condition. For irreversibility of any reaction, no reverse peak is obtained. All the synthesised ligands have only one peak.no reverse peak is obtained in most of the compounds.so we proposed that the process is irreversible.
    Keywords: Cyclic voltammetry, Hydroxytriazenes, Britton-Robinson buffer, KCl, Electrochemical technique