Simultaneous determination of tryptophan, uric acid and ascorbic acid at iron(III) doped zeolite modified carbon paste electrode
Ali Babaei, Mojgan Zendehdel, Balal Khalilzadeh, Alireza Taheri
10/16/2008
Conference
Journal
Colloids and Surfaces B: Biointerface
Volume
66
Issue
Pages
226-232
Publisher
elsevier
Description
A new chemically modified electrode is constructed based on iron(III) doped zeolite modified carbon paste electrode (Fe3+Y/ZCME). The electrode was evaluated as a sensor for sub-micromolar determination of tryptophan (Trp), uric acid (UA) and ascorbic acid (AA) in aqueous solutions. The measurements were carried out by application of the differential pulse voltammetry (DPV) method in phosphate buffer solution with pH 3.5. Iron(III) loaded in zeolite can increase anodic peak currents by adsorption of Trp, UA and AA on electrode surface The analytical performance was evaluated with respect to the carbon paste composition, pH of solution, accumulation time and accumulation potential. The prepared electrode shows voltammetric responses with high sensitivity and selectivity for Trp, UA and AA in optimal conditions, which makes it very suitable for simultaneous determination of these compounds. The linear calibration range for AA in the presence of 50 M UA and 50 M Trp was 0.6 M to 100 M, with a correlation coefficient of 0.9992, and a detection limit of 0.21 M (S/N = 3). A linear relationship was found for UA in the range of 0.3–700 M containing 10 M AA and 50 M Trp, with a correlation coefficient of 0.9990 and a detection limit of 0.08 M. The linear calibration range for Trp in the presence of 10 M AA and 50 M UA was 0.2–150 M, with a correlation coefficient of 0.9996, and a detection limit of 0.06 M. The proposed method was successfully applied for determination Trp, UA and AA in biological systems and pharmaceutical samples
Voltammetric determination of dopamine at a zirconium phosphated silica gel modified carbon paste electrode
Esmaeil Shams, Ali Babaei, Ali Reza Taheri, Mojtaba Kooshki
10/17/2009
Conference
Journal
Bioelectrochemistry
Volume
75
Issue
Pages
83-88
Publisher
Description
Zirconium phosphated amorphous silica gel (devoted briefly as Si–ZrPH) modified carbon paste electrode (CPE) was used for detection of dopamine (DA) in the presence of ascorbic acid (AA) and uric acid (UA). Cyclic voltammetry demonstrated improved reversibility of the DA on the modified electrode. Cyclic voltammetry of Fe(CN)6 3−/4− as a negatively charged probe revealed that the surface of the Si–ZrPH modified CPE surface had a high density of negative charge. As a result, the modified carbon paste electrode could inhibit the voltammetric response of AA and UA while the redox reaction of dopamine was promoted. Based on this, a selective method has been developed to detect DA in the presence of 2500 and 1000 time higher concentration of AA and UA, respectively. The effect of various experimental parameters on the voltammetric response of dopamine was investigated. Under the chosen conditions, the differential pulse voltammetry peak current was found to be linear with DA concentration in the ranges of 0.04 to 50 µM and 50 to 400 µM. The detection limit of the proposed method in the presence of 100 µM of AA and 40 µM of UA was found to be 0.02 µM for DA determination. Satisfying results are achieved when detecting the DA in injection and human serum samples.
A Multi-Walled Carbon Nanotube-Modified Glassy Carbon Electrode as a New Sensor for the Sensitive Simultaneous Determination of Paracetamol and Tramadol in Pharmaceutical Preparations and Biological Fluids.
Ali Babaei,Ali Reza Taheria, Mohammad Afrasiabi
5/5/2011
Conference
Journal
J. Braz. Chem. Soc
Volume
22
Issue
2
Pages
1549-1558
Publisher
Description
A chemically modifed electrode was constructed based on a multi-walled carbon nanotubemodifed glassy carbon electrode (MWCNTs/GCE). It was demonstrated that this sensor can be used for the simultaneous determination of the pharmaceutically important compounds paracetamol (PAR) and tramadol (TRA). The measurements were carried out by the application of differential pulse voltammetry (DPV), cyclic voltammetry (CV) and chronoamperometry (CA) methods. Application of the DPV method demonstrated that in phosphate buffer (pH 7.5) there was a linear relationship between the oxidation peak current and the concentration of PAR over the range 0.5 μmol L-1 to 210 μmol L-1. A similar linear correlation between oxidation peak current and concentration was observed for TRA over the range of 2 μmol L-1to 300 μmol L-1. Under optimal conditions the modifed electrode exhibited high sensitivity, selectivity and stability for both PAR and TRA determination, making it a suitable sensor for the simultaneous submicromolar detection of PAR and TRA in solutions. The analytical performance of this sensor has been evaluated for detection of PAR and TRA in human serum, human urine and some pharmaceutical preparations with satisfactory results.
Simultaneous Voltammetric Determination of Norepinephrine and Folic Acid at the Surface of Modified Carbon Nanotube Paste Electrode
Ali Reza Taheri, Alireza Mohadesi , Dariush Afzali,, Hassan Karimi-Maleh, , Hadi Mahmoudi, Moghaddam, Hassan Zamani,, Zeinab rezayati zad
7/6/2011
Conference
Journal
Int. J. Electrochem. Sci
Volume
6
Issue
Pages
171-180
Publisher
elsevier
Description
The redox response of a modified carbon nanotube paste electrode of ferrocenemonocarboxylic acid (FMC) was investigated. Differential pulse voltammetric peak currents of norepinephrine (NE) increased linearly with its concentrations at the range of 0.52 μM to 530 μM and the detection limit (3σ) was determined to be 0.16 μM. The diffusion coefficient (D) and transfer coefficient (α) of NE were also determined. Mixture of NE and folic acid (FA) can be separated from one another by differential pulse voltammetry. These conditions are sufficient to allow determination of NE and FA both individually and simultaneously
A Sensitive Determination of Acetaminophen in Pharmaceutical Preparations and Biological Samples using Multi-Walled Carbon Nanotube Modified Glassy Carbon Electrode
Ali Babaei,, Mohammad Afrasiabi,Somaieh Mirzakhani, Ali Reza Taheri
10/5/2011
Conference
Journal
J. Braz. Chem. Soc
Volume
22
Issue
2
Pages
344-351
Publisher
elsevier
Description
A chemically modifed electrode is constructed based on multi-walled carbon nanotube modifed glassy carbon electrode (MWCNTs/GCE). It was demonstrated that this sensor could be easily used for determination of acetaminophen (ACT) in aqueous buffered media. The measurements were carried out by application of differential pulse voltammetry (DPV), cyclic voltammetry (CV) and chronoamperometry (CA) methods. Application of DPV method showed two linear dynamic ranges. The frst linear dynamic range was from 0.1 to 22 μmol L-1, with a calibration equation of Ip(μA) = 1.2782c (mmol L-1) + 0.2431 (R2 = 0.9984) and the second linear dynamic range was between 26 to 340 μmol L-1 with a calibration equation of Ip(μA) = 0.7793c (mmol L-1) + 11.615 (R2 = 0.9986). A detection limit of 0.029 μmol L-1 (S/N = 3) was obtained. The modifed electrode showed electrochemical responses with high sensitivity, excellent selectivity and stability for ACT determination at optimal conditions, which makes it a suitable sensor for submicromolar detection of ACT in solutions. The analytical performance of this sensor has been evaluated for detection of ACT in human serum, human urine and a pharmaceutical preparation with satisfactory results.
A multi-walled carbon nano-tube and nickel hydroxide nano-particle composite -modified glassy carbon electrode as a navel sensor for the sensitive simultaneous determination of ascorbic acid, dopamine and uric acid
Ali Babaei, Majid Aminikhah, Ali Reza Taheri
1/30/2012
Conference
Journal
SENSOR LETTERS
Volume
10
Issue
Pages
1-10
Publisher
Elsivier
Description
A chemically modified electrode is constructed based on a multi-walled carbon nano-tubes (MWNTs) and nickel hydroxide nano-particles (NHNPs) composite modified-glassy carbon electrode (MWNTs/NHNPs/GCE). It is demonstrated that this sensor can be used for the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA). The measurements were carried out by the application of differential pulse voltammetry (DPV), cyclic voltammetry (CV) and chronoamperometry (CA) methods. Application of the DPV method demonstrated that in phosphate buffer (pH = 6) there was a linear relationship between the oxidation peak current and the concentration of AA over the range of 7–4500 mol L−1. For DA the linear relationship was in the range of 2–625 mol L−1. A similar linear relationship between oxidation peak current and concentration was observed for UA over the range of 0.8–470 mol L−1. Under optimal conditions the modified electrode exhibited high sensitivity, selectivity and stability for AA, DA and UA determination, making
it a suitable sensor for the simultaneous submicromolar detection of AA, DA and UA in solutions. The experimental results suggest that the hybrid film modified electrode combining the advantages of NHNPs and carbon nanotubes which accelerates the electron transfer reaction of AA, DA and UA on the electrode surface. The analytical performance of this sensor has been evaluated for detection of AA, DA and UA in human serum and human urine with satisfactory results.
Direct electrochemistry and electrocatalysis of Myoglobin immobilized on Chitosan-Nickel hydroxide nanoparticles- Carbon nanotubes-modified Glassy Carbon electrode
Ali Babaei, Ali Reza Taheri
5/12/2012
Conference
Journal
Anal. Bioanal. Electrochem
Volume
4
Issue
4
Pages
342-356
Publisher
Description
A novel myoglobin-based electrochemical biosensor was developed. The fabricated biosensor is based on a nanobiocomposite prepared from multiwalled carbon nanotubes and Ni(OH)2 nanoparticles that were coated with myoglobin and chitosan. Cyclic voltammogram of the electrode showed a pair of well-defined and quasi-reversible redox peaks with a formal potential (E0') of –0.330 V in 0.1 M pH=7.5 phosphate buffer solution, which was the characteristic of the Mb heme Fe(III)/Fe(II) redox couple. Immobilized Mb exhibits excellent electrocatalytic activity toward the reduction of hydrogen peroxide. The linear range for the determination of hydrogen peroxide was from 0.4 to 702 µM with a detection limit of 0.08 µM using chronoamperometry method. The kinetic parameters such as the electron transfer coefficient and the heterogeneous electron transfer rate constant for H2O2 determination were determined using electrochemical approaches. The biosensor was used for determination of H2O2 in human blood serum and the oxidant with satisfactory results
Nafion-Ni(OH)2 nanoparticles-Carbon nanotube Composite Modified Glassy Carbon Electrode for Simultaneous Determination of Dopamine and Serotonin in the presence of ascorbic acid
Ali Babaei, Ali Reza Taheri
4/7/2013
Conference
Journal
Sensors and Actuators B
Volume
176
Issue
Pages
543-551
Publisher
Elsevier
Description
The electrochemical oxidation of dopamine (DA) and serotonin (ST) have been investigated by application of Nafion/Ni(OH)2-multiwalled carbon nanotubes modified glassy carbon electrode (Nafion/Ni(OH)2-MWNTs/GCE) using cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CA) methods. The modified electrode worked as an efficient electron-mediator for DA and ST in the presence of ascorbic acid (AA). Voltammetric techniques separated the anodic peaks of DA and ST, and the interference from AA was effectively excluded from DA and ST determination. The DPV data showed that the obtained anodic peak currents were linearly proportional to concentration in the range of 0.05–25 mol L−1 with a detection limit (S/N = 3.0) of 0.015 mol L−1 for DA and in the range of 0.008–10 mol L−1 and with a detection limit of 0.003 mol L−1 for ST. The proposed sensor was used
for determination of ST and DA in human blood serum with satisfactory results.
Nanomolar simultaneous determination of levodopa and serotonin at a novel carbon ionic liquid electrode modified with Co(OH)2 nanoparticles and multi-walled carbon nanotubes
Ali Babaei, Ali Reza Taheri, Majid Aminikhah
7/27/2013
Conference
Journal
Electrochimica Acta
Volume
90
Issue
Pages
317-325
Publisher
Elsevier
Description
A novel modified carbon ionic liquid electrode is prepared as an electrochemical sensor for simultaneous determination of levodopa (l-dopa) and serotonin (5-HT). The experimental results suggest that a carbon ionic liquid electrode modified with multi-walled carbon nanotubes and cobalt hydroxide nanoparticles, and coated with Nafion (Nafion/Co(OH)2–MWCNTs /CILE), accelerates the electron transfer reactions of l-dopa and 5-HT. In addition it shows no significant interferences of uric acid and ascorbic acid as electroactive coexistent compounds with l-dopa and 5-HT in biological systems. The fabricated sensor revealed some advantages such as convenient preparation, good stability and high sensitivity toward 5- HT and l-dopa determination. The DPV data showed that the obtained anodic peak currents were linearly dependent on the l-dopa and 5-HT concentrations in the range of 0.25–225 and 0.05–75 mol L−1, respectively. The applicability of the modified electrode was demonstrated by simultaneous determination of 5-HT and l-dopa in human serum
Nanomolar simultaneous determination of levodopa and melatonin at a new cobalt hydroxide nanoparticles and multi-walled carbon nanotubes composite modified carbon ionic liquid electrode
Ali Babaei, Ali Reza Taheri, Iman Khani Farahani
9/14/2013
Conference
Journal
Sensors and Actuators B
Volume
183
Issue
Pages
265-272
Publisher
Elsevier
Description
A novel modified carbon ionic liquid electrode (CILE) is prepared as an electrochemical sensor for simultaneous determination of levodopa (l-Dopa) and melatonin (Mel). The experimental results suggest that a carbon ionic liquid electrode modified with multi-walled carbon nanotubes and cobalt hydroxide nanoparticles accelerates the electron transfer reactions of l-Dopa and Mel. The fabricated sensor revealed some advantages such as convenient preparation, good stability and high sensitivity. The DPV data in 0.1 M phosphate buffer solution (PBS) (pH 7.5) allowed a method to be developed for the determination of l-Dopa and Mel concentrations in the ranges 0.1–300 and 0.01–50 M, with the detection limits of 0.075 and 0.004 M, respectively. The proposed method was successfully applied to determinations of these compounds in some pharmaceutical and human urine samples.
Highly sensitive simultaneous determination of L-dopa and paracetamol using a glassy carbon electrode modified with a composite of nickel hydroxide nanoparticles/multi-walled carbon nanotubes
Ali Babaei,, Masoud Sohrabi, Ali Reza Taheri
10/28/2013
Conference
Journal
Journal of Electroanalytical Chemistry
Volume
698
Issue
Pages
45-51
Publisher
Elsevier
Description
The electrochemical oxidation of L-dopa (LD) and paracetamol (PAR) has been investigated by application of nickel hydroxide nanoparticles/multi-wall ed carbon nanotubes composite electrode (MWCNTsNHNPs/GCE) using cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CA) methods. The modified electrode showed electrochemical responses with high sensitivity for LD and PAR determina tion, which makes it a suitable sensor for simultaneou s sub-lmol L1 detection of LD and PAR in aqueous solutions. Under the optimum conditions the electrode provides a linear response versus LD and PAR concentr ations in the range of 0.1–100 lM and 0.06–26 lM, respectively using the DPV method. Linear responses versus LD and PAR concentrations in the range of 1–672 lM and 1– 960 lM, respective ly, were obtained using the CA method. The modified electrode was used for determination of LD and PAR in human urine with satisfactory results.
A Sensor for Determination of Tramadolin Pharmaceutical Preparations and Biological Fluids Based on Multi-Walled Carbon Nanotubes-Modified Glassy Carbon Electrode
Afrasiabi, M, Rezayati zad, Z, Kianpour, sh., Babaei, A., Taheri, A.R
11/29/2013
Conference
Journal
J.Chem.Soc.Pak.,
Volume
35
Issue
4
Pages
1106-1112
Publisher
Description
A chemically modified electrode is constructed based on multi-walled carbon nanotube modified glassy carbon electrode (MWCNTs/GCE). It is demonstrated that this sensor could be used for determination of pharmaceutical important compound tramadol (TRA). The measurements were carried out using differential pulse voltammetry (DPV), cyclic voltammetry (CV) and
chronoamperometry (CA) methods. DPV experiments of various concentration of TRA showed two linear dynamic ranges. The first linear dynamic range was from 4 µM to 35 µM, and the second linear dynamic range was between 60 µM to 550 µM. A detection limit of 0.38 µM (S/N = 3) was obtained. The analytical performance of this sensor has been evaluated for the detection of TRA in human serum, human urine and some pharmaceutical preparations with satisfactory results.
Determination of Paraquat in Fruits and Natural Water using Ni(OH)2 Nanoparticles-Carbon Nanotubes Composite Modified Carbon Ionic liquid Electrode
Reza Faramarzi, Ali Reza Taheri, Mahmoud Roushani
12/31/2015
Conference
Journal
Anal. Bioanal. Electrochem.
Volume
7
Issue
6
Pages
663-683
Publisher
www.abechem.com
Description
A novel analytical approach has been developed and evaluated for the quantitative analysis of paraquat herbicides which can be found at trace levels in the presence of ascorbic
acid and uric acid. The experimental results suggest that a carbon ionic liquid electrode modified with multi-walled carbon nanotubes and nickel hydroxide nanoparticles accelerates
the electron transfer reactions of paraquat. The best responses were obtained with differential potential and chronoamperometry methods in Phosphate buffer (pH, 7.5). The influence of
various parameters on the electrode was investigated. Under the optimized working conditions, calibration graphs were linear in the concentration ranges of 0.0025–25 mg L-1
with a detection limit (S/N=3.0) of 0.8 ppb. The proposed electrode was used for determination of paraquat in fruits and River water samples with satisfactory results
Highly selective determination of amitriptyline using Nafion-AuNPs@ branched polyethyleneimine-derived carbon hollow spheres in pharmaceutical drugs and biological fluids
Zeinab Rezayati Zad, Saied Saeed Hosseiny Davarani, Ali Reza Taheri , Yasamin Bide
7/8/2016
Conference
Journal
Biosensors and Bioelectronics
Volume
86
Issue
Pages
616–622
Publisher
Elsevier
Description
In this paper, AuNPs@Polyethyleneimine-derived carbon hollow spheres were synthesized by a versatile and facile method in three steps and successfully developed and validated as Amitriptyline sensor using cyclic voltammetry (CV), chronoamperometry (CA) and differential pulse voltammetry (DPV) methods. The characterization of the electrode surface has been carried out by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), x-ray photo-electron spectrum (XPS), electrochemical impedance spectroscopy (EIS) and chronocoulometry (CC). The obtained negatively charged modified electrode was highly selective to Amitriptyline and it was shown a wide
linear range from 0.1 to 700 μmol L1, with a lower detection limit of 0.034 μmol L1 (n¼5, S/N¼3), revealing the high-sensitivity properties. The modified electrode is used to achieve the real-time quantitative detection of AMT for biological applications, and satisfactory results are obtained. Due to the advantages of the sensor, its selectivity, sensitivity and stability, it will have a bright future in the field of medical diagnosis
Highly selective solid phase extraction and preconcentration of Azathioprine with nano-sized imprinted polymer based on multivariate optimization and its trace determination in biological and pharmaceutical samples
Saied Saeed Hosseiny Davarani, Zeinab Rezayati zad, Ali Reza Taheri, Nasrin Rahmatian
9/29/2016
Conference
Journal
Materials Science and Engineering C
Volume
71
Issue
Pages
572–583
Publisher
www.el sevier.com/locate/msec
Description
In this research, for first time selective separation and determination of Azathioprine is demonstrated using molecularly imprinted polymer as the solid-phase extraction adsorbent, measured by spectrophotometry at λmax 286 nm. The selective molecularly imprinted polymer was produced using Azathioprine and methacrylic acid as a template molecule and monomer, respectively. A molecularly imprinted solid-phase extraction procedure was performed in column for the analyte from pharmaceutical and serum samples. The synthesized polymers were characterized by infrared spectroscopy (IR), field emission scanning electron microscopy (FESEM). In order to investigate the effect of independent variables on the extraction efficiency, the response surface methodology (RSM) based on Box–Behnken design (BBD) was employed. The analytical parameters such as precision, accuracy and linear working range were also determined in optimal experimental conditions and the proposed method was applied to analysis of Azathioprine. The linear dynamic range and limits of detection were 2.5–0.01 and 0.008 mg L‐1 respectively. The recoveries for analyte were higher than 95% and relative standard deviation values were found to be in the range of 0.83–4.15%. This method was successfully applied for the determination of Azathioprine in biological and pharmaceutical samples.
A yolk shell Fe3O4@PA-Ni@Pd/Chitosan nanocomposite -modified carbon ionic liquid electrode as a new sensor for the sensitive determination of fluconazole in pharmaceutical preparations and biological fluids,
Z.R. Zad, S.S.H. Davarani, A. Taheri, Y. Bide,
1/4/2018
Conference
Journal
Journal of Molecular Liquids
Volume
253
Issue
Pages
233-240
Publisher
elsevier
Description
In this study, a versatile method was used to synthesize Ni@Pd core–shell nanoparticles, immobilized on Fe3O4@ polyaniline yolk–shell composites (Fe3O4@PA). The constructed Fe3O4@PA-Ni@Pd composite and Chitosan were utilized for the modification of carbon ionic liquid electrode (CILE) in high sensitive determination of fluconazole (FLU). A carbon ionic liquid electrode constructed using graphite powder mixed with 1-Butyl-3- methylimidazolium hexafluorophosphate ([BMIM][PF6]) in place of paraffin as the binder showed strong electrocatalytic activity to the direct oxidation of Fluconazole. The properties of the electrode surface were characterized by scanning electron microscope (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), Thermal gravimetric analysis (TGA), X-Ray Photo-Emission Electron Microscopy (XPES), Electrochemical Impedance Spectroscopy (EIS), Chronocoulometry (CC) and chronoamperometery (CA) techniques. The recommended quadratic model obtained from the full factorial Box–Behnken design (BBD) was in accordance with the experimental data in an acceptable range. The response was studied in relation to such critical factors as pH, accumulation time, concentration of nanoparticles, and scan rate. The peak currents were proportional to fluconazole concentration in a linear range from 0.01 to 400 μmol L−1, with a detection limit of 3.5 nmol L−1. Then the constructed
sensor was successfully used for the quantification of fluconazole in serum, urine, and tablets.
Preparation and evaluation of magnetic core–shell mesoporous molecularly imprinted polymers for selective adsorption of amitriptyline in biological samples
K. Kamari, A. Taheri,
1/24/2018
Conference
Journal
Journal of the Taiwan Institute of Chemical Engineers
Volume
86
Issue
Pages
230-239.
Publisher
Description
In this study, preparation of magnetic surface molecular imprinted polymer (MMIP) is employed for sensitive solid phase extraction and measurement of amitriptyline (AMT) by spectrophotometric technique. After polymerization, cavities in the polymer particles corresponding to the AMT were created by leaching the polymer by an appropriate solution. The synthesized nanoparticles of magnetic surface molecular imprinted polymer mesoparticles (Fe3O4@SiO2–MIP) were characterized by transfer electron microscopy (TEM), vibrating sample magnetometer (VSM), Fourier transform infrared spectroscopy (FTIR), X-Ray Diffraction (XRD) and Brunauer–Emmett–Teller (BET). Also, the pH of zero-point charge (pHzpc) for Fe3O4@SiO2–MIP was determined with the pH drift method. The influence of various parameters such as pH, amount of polymer and contact time were investigated by an optimization technique named Box– Behnken design (BBD) and the proposed quadratic model was fitted very well with the experimental data. The validity of optimum parameters and the equation of parameters were investigated by analysis of variance (ANOVA). Also Scatchard isotherm was explored for the equilibrium adsorption investigation and finally, the prepared polymer was successfully applied to the selective identification and the determination of AMT in plasma samples
Synthesis and application of a novel core-shell-shell magnetic ion imprinted polymer as a selective adsorbent of trace amounts of silver ions
Rahil Jalilian and Alireza Taheri
7/10/2018
Conference
Journal
e-Polymers
Volume
18
Issue
Pages
123-134
Publisher
DE GRUYTER
Description
Ion-imprinted polymer (IIP) technology has received considerable attention for its greatest potential application. In this work, a novel magnetic nano ionimprinted polymer (MIIP) for the selective and sensitive pre-concentration of silver (I) ions were used. It was obtained using Fe3O4@SiO2@TiO2 nanoparticles as a magnetic support of adsorbent, Ag(I)-2,4-diamino-6-phenyl- 1,3,5-triazine (DPT) complex as the template molecule and methacrylic acid (MAA), 2,2′-azobisisobutyronitrile (AIBN), ethylene glycol dimethacrylate (EGDMA), as the functional monomer, the radical initiator and crosslinker, respectively. The synthesized polymer nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM) and BrunauerEmmett-Teller (BET). Silver ions were separate from the polymer and measured by flame atomic absorption spectrometry (FAAS). The maximum adsorption capacity of the novel imprinted adsorbent for Ag(I) was calculated to be 62.5 mg g−1. The developed method was applied to the preconcentration of the analyte in the water, radiology film and food samples, and satisfactory results were obtained
Ultrasensitive and selective non-enzymatic glucose detection based on pt electrode modified by carbon nanotubes@ graphene oxide/ nickel hydroxide-Nafion hybrid composite in alkaline media
S. Mohammadi, A. Taheri, Z. Rezayati-Zad,
12/24/2018
Conference
Journal
Progress in Chemical and Biochemical Research
Volume
1-10
Issue
Pages
Publisher
Description
A new enzymeless glucose sensor has been fabricated and its electrocatalytic oxidation has been investigated in alkaline medium directly on the Pt Electrode modified by Activated carbon nanotubes @ graphene oxide/ nickel hydroxide-Nafion hybrid composite (Pt\ACNT@GO\NHNPs\Nf). Under the optimized condition, the calibration curve is linear in the concentration range of 5-1100 µM using cyclic voltammetric method. The detection limit and sensitivity are 0.75 µM and 40 nA, respectively. The glucose sensor can be renewed easily in a reproducible manner by a simple polishing step and it has a long operational lifetime and short response time t90% < 1 s. In addition, the fabrication of Pt with nafion and nickel hydroxide powder was mployed to eliminate the interference of ascorbic acid during the catalytic oxidation of glucose. The biosensor was used for determination of glucose in human blood serum and the oxidant with satisfactory results.
Application of selective solid-phase extraction using a new core-shell-shell magnetic ion-imprinted polymer for the analysis of ultra-trace mercury in serum of gallstone patients
F. Abdollahi, A. Taheri, M. Shahmari,
11/19/2019
Conference
Journal
Separation Science and Technology
Volume
Issue
Pages
1-14.
Publisher
Taylor
Description
ABSTRACTA new ultrasonically assisted spectrophotometric method was developed using stabilized ion polymer on a modified nano-absorbent as a core- shell-shell absorbent (Fe3O4@SiO2@TiO2?IIP). It has the advantages of further stabilizing the polymer and consequently and much higher efficiency than its conventional adsorbents. The prepared sorbent was characterized and Its parameters were investigated by a Box?Behnken design. The linear dynamic range and limit of detection were 0.20?28.00 µg L?1 and 0.05 µg L?1 respectively. In selectivity study, it was founded that imprinting causes increased affinity of the prepared IIP toward Hg2+ ion. The proposed IIP is considered to be promising and selective sorbent for solid-phase extraction and preconcentration of Hg2+ ion in sera of different types of gallstone patients.
Ultrasonic-assisted micro solid phase extraction of arsenic on a new ion-imprinted polymer synthesized from chitosan-stabilized pickering emulsion in water, rice and vegetable samples, Ultrason Sonochem
R. Jalilian, M. Shahmari, A. Taheri, K. Gholami
5/22/2020
Conference
Journal
Ultrason Sonochem
Volume
61
Issue
Pages
104802
Publisher
Elsevier
Description
Pickering emulsion polymerization has been employed for the Ultrasonic assisted-micro solid phase extraction (UA-microSPE) of ultra trace arsenic species by a new magnetic ion imprinted polymer (MIIP) prior to hydride generation atomic absorption spectrometry. 2-acetyl benzofuran thiosemicarbazone (2-ABT) as a new chelating agent and core- shell hydrophobic magnetic nanoparticles was synthesized and the polymerization was carried out at the presence of arsenic - ligand complex, crosslinker, monomer, initiator, stabilizing agent and water-oil emulsion magnetic carrier. In second step, the nanoparticles and polymers were characterized. The analytical parameters such as pH, amount of polymer and ultrasonic time were selected and optimozed by Plackett-Burman and Box-Behnken designs respectively. Linear dynamic range, detection limit and relative standard deviation were 0.01-85.000microg.L(-l), 0.003microg.L(-l), and 3.21%, respectively. The proposed preconcentration procedure was successfully applied to the determination of arsenic ion in a wide range of food samples with different and complex matrixes.
Fatty acid profile and heavy metal (copper, chromium and cobalt) content in animal oils in Ilam province
S. Gholami Gilani, A. Taheri, G. Gholami Gilani, M. Shahmari,
9/9/2020
Conference
Journal
مجله علمی و پژوهشی بهداشت مواد غذایی
Volume
10
Issue
Pages
30-15
Publisher
Description
In determining the quality of oils, heavy metal content, physical-chemical indices and fatty acid profile, especially trans fatty acids are important factors. In this study, animal oil samples of different regions of Ilam province were studied. After digestion and extraction by microwave assisted acid digestion, the heavy metals content of the samples was measured by an improved flame atomic absorption spectroscopy method. Moreover, after extraction and derivatization of the oils, fatty acid profile was analyzed by gas chromatography. In order to facilitate the conclusion of the data obtained, samples of different regions of the province were divided into three parts: northern, southern and central cities. According to the results, copper, cobalt and chromium levels were reported in the range of 0.04-4.47, 0.02-2.33 and 0.02-3.54 mg/kg, respectively, which were below the maximum permissible levels. It was revealed that using the modified gas chromatography method, it is possible to separate and measure 27 fatty acids simultaneously. Besides, acceptable degree of extraction of oleic and linoleic acid is extracted to calculate the cis and trans isomers, was achieved.
Design and Fabrication of Gold Nanoparticles for Anti-Asthma Drug Delivery
D. Mehrabi Nasab, A. Taheri, S.S. Athari,
11/9/2020
Conference
Journal
Archives of Medical Laboratory Sciences
Volume
6
Issue
Pages
e4.
Publisher
Description
Background and Aim: Nanoparticle drug delivery has recently found a special place in medicine and treatment. Different nanoparticles have different capabilities and functions. Gold nanoparticles are one of the most widely used nanoparticles and have many uses in pharmaceuticals and medical purposes, including diagnostic, therapeutic, and imaging methods, and due to their unique characteristics, such as high contact surface area compared to volume. Gold nanoparticles have many advantages over other nanoparticles such as their neutral nature, stability, high diffusion property, non-toxicity, environmental compatibility, optical adjustment. Our goal is to synthesize and characterization gold nanoparticles with specific applications to produce the best delivery system of drugs to the asthmatic lung.Methods: Turkevich method has been used for the synthesis of gold nanoparticles and approving studies have been done.Results: The produced GNP has the average diameter 100-200 nm and the Z-average was 137.9 d.nm and in positive charge area. PDI for GNP was 0.358.Conclusion: In this study, we were able to produce the applicable gold nanoparticles for carrying drugs to asthmatic bronchi. Gold nanoparticles easily reach target cells due to their high dispersion power. Drug side effects are reduced when gold nanoparticles are used in conjunction with the drug for drug delivery purposes.*Corresponding Authors:Alireza Taheri, Email: taheri@ilam-iau.ac.ir; Seyyed Shamsadin Athari, Email: ss.athari@zums.ac.irPlease cite this article as: Mehrabi Nasab D, Taheri A, Athari SS. Design and Fabrication of Gold Nanoparticles for Anti-Asthma Drug Delivery. Arch Med Lab Sci. 2020;6:e4. https://doi.org/10.22037/amls.v6.32580