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Chinese Chemical Letters 2012年第2期23卷 213-216页

作者： Mohammad Mazloum-Ardakani Hossein Rajabi hadi beitollahi Department of Chemistry Faculty of ScienceYazd UniversityYazd 89195-741Iran Department of Chemistry Faculty of ScienceYazd UniversityYazd 89195-741Iran Environment Department Research Institute of Environmental SciencesInternational Center for ScienceHigh Technology & Environmental SciencesKermanIran

The homogeneous electrocatalytic oxidation of hydrazine（HZ） has been studied by indigocarmine（IND） as a mediator at the surface of TiO_2 nanoparticles modified carbon paste electrode（TNMCPE）.Cyclic voltammetry was used to study the electrochemical behavior of IND at different scan *** voltammetric response of the modified electrode was linear against the concentration of HZ in the ranges of 3.0×l0^（-8）-7.0×10~6 mol/L with differential pulse voltammetry *** detection limit（3σ） was determined as 27.3 nmol/*** evaluate the applicability of the proposed method to real samples,the modified CPE was applied to the determination of HZ in water samples.

关键词： Hydrazine Indigocarmine TiO_2 nanoparticles Modified electrode Carbon paste electrode Nanomolar detection

Stripping voltammetric determination of Cd(Ⅱ)based on multiwalled carbon nanotube functionalized with 1-(2-pyridylazo)-2-naphthol

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Chinese Chemical Letters 2011年第12期22卷 1469-1472页

作者： Alireza Mohadesi hadi beitollahi Mohammad Ali Karimi Department of Chemistry Payame Noor UniversityTehran 19395-4697Iran Department of Chemistry Payame Noor University(PNU)P.O.Box 76175-559KermanIran Environmental Department Research Institute of Environmental SciencesInternational Center for SciencesHigh Technology and Environmental SciencesKermanIran Department of Chemistry & Nanoscience and Nanotechnology Research Laboratory(NNRL) Payame Noor University(PNU)SirjanIran

The present work has focused on the modification of multiwalled carbon nanotube with a ligand,l-（2-pyridylazo）-2-naphthol, and its potential application for the development of a new,simple and selective modified glassy carbon electrode for stripping voltammetric determination of Cd（Ⅱ）.The analytical curve for Cd（Ⅱ） ions covered the linear range varying from 0.8 up to 220.4μgL^（-1）.The limit of detection was found to be 0.1μgL^（-1）,while the relative standard deviation（RSD） at 50.0μgL^（-1） was 1.8%（n=5）.This modified electrode was successfully applied for determination of Cd（Ⅱ） in some water samples.

关键词： Multiwalled carbon nanotube 1-(2-Pyridylazo)-2-naphthol Cadmium(Ⅱ) Stripping voltammetry

Electrocatalytic determination of epinephrine and uric acid using a novel hydroquinone modified carbon paste electrode

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Chinese Chemical Letters 2011年第6期22卷 705-708页

作者： Mohammad Mazloum-Ardakani Zahra Taleat hadi beitollahi Hossein Naeimi Department of Chemistry Faculty of Science Yazd University Department of Organic Chemistry Faculty of Chemistry University of Kashan

A sensitive and selective electrochemical method for the determination of epinephrine（EP） was developed using a modified carbon paste electrode（MCPE） with 2,2＇-[3,6-dioxa-1,8-octanediylbis（nitriloethylidyne）]-bis-hydroquinone（DOH）.Cyclic voltammetry was used to investigate the redox properties of this modified electrode at various solution pH values and at various scan *** differential pulse voltammetry,the modified electrode could separate the oxidation peak potentials of EP and uric acid（UA） present in the solution but at the unmodified CPE the peak potentials were *** method was also examined for determination of EP in EP injection.

关键词： Epinephrine Uric acid Electrocatalysis Modified electrode

Electrocatalytic determination of L-cysteine using a modified carbon nanotube paste electrode:Application to the analysis of some real samples

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Chinese Chemical Letters 2012年第8期23卷 981-984页

作者： Malihe Ahmadipour Mohammad Ali Taher hadi beitollahi Rahman Hosseinzadeh Department of Chemistry Shahid Bahonar University of KermanP.O.Box 76175-133KermanIran Young Researchers Society Shahid Bahonar University of KermanP.O.Box 76175-133KermanIran Environment Department Research Institute of Environmental SciencesInternational Center for ScienceHigh Technology&Environmental SciencesKermanIran Department of Organic Chemistry Faculty of ChemistryUniversity of MazandaranBabolsarIran

The electrooxidation of L-cysteine（L-Cys） was studied using a benzoylferrocene（BF） modified multi-wall carbon nanotube paste electrode（BFCNPE） using cyclic voltammetry（CV）,square wave voltammetry（SWV） and chronoamperometry（CHA）.Under optimum pH in CV the oxidation of L-Cys occurs at a potential about 215 mV less positive than that at the surface of unmodified carbon paste *** catalytic oxidation peak currents were dependent on the L-Cys concentration and a linear calibration curve was obtained in the range 0.7-350.0 mmol/L of L-Cys with SWV *** detection limit（3s） was determined as 0.1 mmol/*** method was also used for the determination of L-Cys in some real samples.

关键词： L-Cysteine Carbon paste electrode Carbon nanotubes Voltammetry

对乙酞氨基酚和色氨酸存在下采用改进的碳纳米管糊电极伏安法测定抗坏血酸(英文)

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催化学报 2013年第6期34卷 1098-1104页

作者： hadi beitollahi Somayeh MOHAMMADI Environment Department Institute of Science and High Technology and Environmental SciencesGraduate University of Advanced TechnologyKermanIran Department of Chemistry Payame Noor University19395‐4697TehranIran

A carbon paste electrode (CPE) modified with carbon nanotubes and 5‐amino‐3',4'‐dimethyl‐ bi‐ phenyl‐2‐ol (5ADB) is prepared. Under the optimum pH of 7.0, the oxidation of ascorbic acid (AA) on the modified CPE occurs at a potential about 280 mV less positive than that on the unmodified CPE. Some kinetic and thermodynamic parameters for electrocatalytic oxidation of AA, including electron transfer coefficient (α = 0.58) and diffusion coefficient (D = 2.2 × 10-6 cm2/s), are also determined. AA, acetaminophen (AC), and tryptophan (TRP) were detected simultaneously using the modified CPE. The peak potentials recorded using the modified CPE in phosphate‐buffered solution at pH 7.0 were 265, 465, and 780 mV for AA, AC, and TRP, respectively. The modified CPE was successfully used to determine the concentrations of AA, AC, and TRP in real samples.

关键词： Ascorbic acid Acetaminophen Tryptophan Carbon nanotube paste electrode Electrocatalysis

Voltammetric determination of isoproterenol using a 5-amino-2',4'-dimethoxybiphenyl-2-ol modified carbon nanotube paste electrode

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Chinese Chemical Letters 2012年第6期23卷 719-722页

作者： hadi beitollahi Hoj atollah Khabazzadeh Hassan Karimi-Maleh Ali Akbari Environment Department Research Institute of Environmental SciencesInternational Center for ScienceHigh Technology & Environmental SciencesKermanIran Department of Chemistry Shahid Bahonar University of KermanKermanIran Department of Chemistry Science and Research BranchIslamic Azad UniversityMazandaranIran Department of Chemistry University of JiroftJiroftIran

A new electrochemical sensor for determination of isoproterenol （IP） is described. The sensor is based on carbon paste electrode （CPE） modified with 5-amino-2＇,4＇-dimethoxybiphenyl-2-ol （5ADMB） and takes the advantages of carbon nanotubes （CNTs）. Under the optimum pH of 7.0, the oxidation of IP occurs at a potential about 210 mV less positive than that of the unmodified CPE. The oxidation currents increased linearly with two concentration intervals oflP, one is 0.09 to 20.0 μ mol/L and, the other is 20.0 to 400.0 μmol/L. The detection limit （3or） obtained by square wave voltammetry （SWV） was 39.0 μmol/L. The practical application of the modified electrode was demonstrated by determining IP in IP ampoule, urine and human blood serum samples.

关键词： Isoperoterenol Carbon nanotube Electrocatalysis Voltammetry

Application of graphite screen printed electrode modified with dysprosium tungstate nanoparticles in voltammetric determination of epinephrine in the presence of acetylcholine

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Journal of Rare Earths 2018年第7期36卷 750-757页

作者： hadi beitollahi Zahra Dourandish Somayeh Tajik Mohammad Reza Ganjali Parviz Norouzi Farnoush Faridbod Environment Department Irtstitute of Science and High Technology and Environmental SciencesGraduate University of Advanced Technology Department of Chemistry Graduate University of Advanced Technology NanoBioElectrochemistry Research Center Bam University of Medical Scicnce Center of Excellence in Electrochemistry Faculty of ChemistryUniversity of Tehran Biosensor Research Center Endocrinology & Metabolism Molecular-Cellular Sciences InstituteTehran University of Medical Sciences

The current work focuses on the development of a sensitive and selective electrochemical device based on a graphite screen printed electrode modified with Dy2（WO4）3 nanoparticles（DWO/SPE） for the analysis of epinephrine in samples also containing acetylcholine. The study proves that the sensor has excellent electron-mediating behavior in the oxidation of epinephrine in a 0.1 mol/L phosphate buffer solution（PBS）（pH 7.0）. The application of the DWO/SPE in differential pulse voltammetry（DPV） is found to lead to distinct response for the oxidation of epinephrine and acetylcholine, with the potentials of the epinephrine and acetylcholine peaks（△Ep） to be 550 mV apart. The detection limits of the method for epinephrine and acetylcholine are 0.5 and 0.7 μmol/L（S/N = 3） and the responses are found to be linear in the concentration ranges of 1.0-900.0 μmol/L and 1.0-1200.0 μmol/L in a PBS buffer（pH = 7.0）respectively. The modified electrode was used for the detection of epinephrine and acetylcholine in real samples and found to produce satisfactory results. These results can be a proof that Dy2（WO4）3 nanoparticles can find promising applications in electrochemical sensors to be used for the analysis of（bio）chemical species.

关键词： Epinephrine Acetylcholine Dy2(WO4)3 nanoparticles Graphite screen printed electrode Rare earths

Voltammetric determination of venlafaxine as an antidepressant drug employing Gd_2O_3 nanoparticles graphite screen printed electrode

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Journal of Rare Earths 2019年第3期37卷 322-328页

作者： hadi beitollahi Shohreh Jahani Somayeh Tajik Mohammad Reza Ganjali Farnoush Faridbod Taher Alizadeh Environment Department Institute of Science and High Technology and Environmental Sciences Graduate University of Advanced Technology NanoBioElectrochemistry Research Center Bam University of Medical Sciences Center of Excellence in Electrochemistry School of Chemistry College of Science University of Tehran Biosensor Research Center Endocrinology & Metabolism Molecular-Cellular Sciences Institute Tehran University of Medical Sciences Department of Analytical Chemistry Faculty of Chemistry College of Science University of Tehran

Graphite screen printed electrode modified with Gd_2 O_3 nanoparticles(Gd_2 O_3/SPE) was developed for the determination of venlafaxine(VF). The Gd_2 O_3 nanoparticles were thoroughly characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM) and X-ray diffraction(XRD) analyses. To study the electrochemical behaviour of venlafaxine cyclic voltammetry(CV), chronoamperometry(CHA)and differential pulse voltammetry(DPV) were employed. These studies reveal that the oxidation of venlafaxine is facilitated at Gd_2 O_3/SPE. After optimization of analytical conditions, analysis of venlafaxine using the modified electrode in 0.1 mol/L PBS(pH 7.0) demonstrates that the peak currents corresponding to venlafaxine vary linearly with its concentration in the range of 5.0 ×10^(-6)-9.0 × 10^(-4) mol/L. The detection limit(S/N = 3) of 2.1 × 10^(-7) mol/L is obtained for venlafaxine using DPV. The prepared modified electrode benefits from advantages such as simple preparation method, high sensitivity and low detection ***, the evaluation of practical applicability of this proposed method is successful in the identification of venlafaxine in pharmaceutical formulations, urine and water samples.

关键词： Venlafaxine Gd2O3 nanoparticles Electrochemical techniques Screen printed electrode Rare earths

Electrochemical determination of vitamin C in the presence of uric acid by a novel TiO_2 nanoparticles modified carbon paste electrode

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Chinese Chemical Letters 2010年第12期21卷 1471-1474页

作者： Mohammad Mazloum-Ardakani Mohammad Ali Sheikh-Mohseni hadi beitollahi Ali Benvidi Hossein Naeimi Department of Chemistry Faculty of ScienceYazd UniversityYazd89195-741I.R.Iran Department of Organic Chemistry Faculty of ChemistryUniversity of KashanKashanI.R.Iran

The electrochemical behavior of vitamin C（ascorbic acid or AA） is investigated on the surface of a carbon-paste electrode modified with TiO2 nanoparticles and 2,2＇-（1,2 butanediylbis（nitriloethylidyne））-bis-hydroquinone（BBNBH）.The prepared modified electrode showed an efficient catalytic role in the electrochemical oxidation of AA,leading to remarkable decrease in oxidation overpotential and enhancement of the kinetics of the electrode *** modified electrode exhibits well-separated oxidation peaks for AA and uric acid（UA）.The modified electrode is successfully applied for the accurate determination of AA in pharmaceutical preparations.

关键词： Ascorbic acid Uric acid TiO2 nanoparticles Electrocatalysis Modified carbon paste electrode

Simultaneous determination of cysteamine and folic acid in pharmaceutical and biological samples using modified multiwall carbon nanotube paste electrode

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Chinese Chemical Letters 2012年第2期23卷 237-240页

作者： Ali Taherkhani Hassan Karimi-Maleh Ali A.Ensafi hadi beitollahi Ahmad Hosseini Mohammad A.Khalilzadeh Hassan Bagheri Department of Physics Takestan Branchlslamic Azad UniversityTakestanlran Department of Chemistry Majlesi BranchIslamic Azad UniversityIsfahanIran Environment Department Research Institute of Environmental SciencesInternational Center for ScienceHigh Technology and Environmental SciencesKermanIran Department of Chemistry Qaemshahr BranchIslamic Azad UniversityQaemshahrlran Department of Chemistry Takestan Branchlslamic Azad UniversityTakestanlran

A carbon paste electrode（CPE） chemically modified with multiwall carbon nanotubes and ferrocene（FC） was used as a selective electrochemical sensor for the simultaneous determination of trace amounts of cysteamine（CA） and folic acid（FA）.This modified electrode showed very efficient electrocatalytic activity for the anodic oxidation of *** peak current of differential pulse voltammograms of CA and FA increased linearly with their concentration in the ranges of 0.7-200μmol/L CA and 5.0- 700μmol/L *** detection limits for CA and FA were 0.3μmol/L and 2.0μmoI/L,*** diffusion coefficient（D） and transfer coefficient（α） of CA were also *** conditions are sufficient to allow determination of CA and FA both individually and simultaneously.

关键词： Cysteamine Folic acid Carbon nanotube paste electrode Voltammetry