scholarly journals Lanthanum Ortho-Ferrite (LaFeO3) Nano-Particles Based Electrochemical Sensor for the Detection of Dopamine

2020 ◽  
Vol 10 (5) ◽  
pp. 6182-6188
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Sensor ◽  
Differential Pulse Voltammetry ◽  
Phosphate Buffer Solution ◽  
Differential Pulse ◽  
Nano Particles ◽  
Ferric Nitrate ◽  
Buffer Solution ◽  
Pulse Voltammetry ◽  
Modified Sensor

The perovskite type lanthanum ortho ferrite nano-particles (LaFeO3) based electrochemical sensor was developed and used to detect dopamine. For this work the lanthanum ortho ferrite nano-particles (LaFeO3) were synthesized by combustion technique using sugar and ethanolamine with lanthanum oxide and ferric nitrate. For the characterization of newly prepared lanthanum ortho ferrite nano-particles, techniques like FESEM, and TEM were used. The crystallite size was found to be 40 to 46 nm with cubic crystal structure. To check the electrochemical properties of a modified sensor electrode (LaFeO3/GP), the cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques were used. During the experiment, the phosphate buffer solution having pH 6.0 was employed, maintaining the scan rate 100mVs-1 and 50mVs-1 for cyclic voltammetry and Differential pulse voltammetry, respectively.

scholarly journals Praseodymium ferrite nano-particles based modified electrode and its application in determination of dopamine

2020 ◽  
Vol 10 (4) ◽  
pp. 5855-5859
Keyword(s):  
Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Differential Pulse Voltammetry ◽  
Limit Of Detection ◽  
Phosphate Buffer Solution ◽  
Differential Pulse ◽  
Nano Particles ◽  
Ferric Nitrate ◽  
Buffer Solution ◽  
Pulse Voltammetry

The present works report the graphite based electrochemical sensor modified by nano-sized praseodymium ferrite (np-PrFeO3) materials for the detection of dopamine. The combustion technique was used to synthesize these nanomaterials of np-PrFeO3 using praseodymium oxide and ferric nitrate as precursor materials. The nanomaterials were characterized by field emission scanning electron microscopy and transmission electron microscopy techniques. The crystallite sizes of synthesized nanoparticles (nps) were in the range from 40-45 nm with cubic crystal system. Cyclic voltammetry and Differential pulse voltammetry techniques were used to study the electrochemical property and were observed to be superior to earlier reports. The limit of detection of dopamine at PrFeO3/GP electrode was 600 nM with 5 to 200 µM for linearity range. The phosphate buffer solution of pH 6.0 was used for all experimental work with maintaining the scan rate 100mVs-1 and 50mVs-1 for cyclic voltammetry and Differential pulse voltammetry, respectively.

Sensitive Determination of Epinephrine in the Presence of Ascorbic Acid at Poly(diphenylamine sulfonic acid) Modified Sensor

2020 ◽  
Vol 18 (4) ◽  
pp. 253-258
Author(s):  
Gamze Erdoğdu
Keyword(s):  
Ascorbic Acid ◽  
Sulfonic Acid ◽  
Limit Of Detection ◽  
Phosphate Buffer Solution ◽  
Differential Pulse ◽  
Buffer Solution ◽  
Sensitive Determination ◽  
Pulse Voltammetry ◽  
Modified Sensor

A sensitive and simple modified sensor was prepared by electrodeposition of diphenylamine sulfonic acid (DPSA) to the glassy carbon electrode surface by cyclic voltammetry (CV) technique. The electrooxidation of epinephrine (EP) was accomplished by CV and differential pulse voltammetry at poly(DPSA) modified sensor. As a result of the findings, the current values were enhanced and both substances were separated at the modified sensor compared to the bare electrode. There was linearly between the oxidation current and concentration of EP from 0.2 to 100 μM in phosphate buffer solution at pH 7.0. The limit of detection was 5.0 nM and the sensitivity was 0.4205 μA/μM. The determination of EP was successfully and satisfactorily carried out in real samples such as human blood serum and urine at the poly(DPSA) sensor. To the best knowledge of this work, this is the first study that detect the EP in the presence of ascorbic acid at poly(DPSA) sensor in the literature.

Electrochemical Determination of Norepinephrine at Poly (p-aminobenzenesulfonic Acid) Modified Sensor

2020 ◽  
Vol 16 (5) ◽  
pp. 591-600
Author(s):  
Şevket Zişan Yağcı ◽  
Ebru Kuyumcu Savan ◽  
Gamze Erdoğdu
Keyword(s):  
Ascorbic Acid ◽  
Limit Of Detection ◽  
Phosphate Buffer Solution ◽  
Differential Pulse ◽  
Electrochemical Determination ◽  
Buffer Solution ◽  
Oxidation Current ◽  
Pulse Voltammetry ◽  
Modified Sensor

Objective: In this study, it was aimed to prepare an electrochemical sensor capable of assigning Norepinephrine in the presence of an interference such as ascorbic acid. Methods: A sensitive modified sensor was prepared by electrodeposition of p-aminobenzenesulfonic acid (p-ABSA) to the glassy carbon electrode by cyclic voltammetry. The electrooxidation of Norepinephrine was accomplished by cyclic and differential pulse voltammetry. Results: The current values were enhanced and the peak potentials of Norepinephrine and ascorbic acid were separated at the sensor compared to the bare electrode. There was linearity between the oxidation current and concentration of Norepinephrine ranging from 0.5 to 99.8 μM in phosphate buffer solution at pH 7.0. The limit of detection was 10.0 nM and the sensitivity was 0.455 μA/μM. Conclusion: The determination of Norepinephrine was successfully performed in real samples such as blood serum and urine at the poly (p-ABSA) sensor. To the best of our knowledge, this is the first study to detect Norepinephrine in the presence of ascorbic acid at poly (p-ABSA) modified sensor in the literature.

Electro-oxidation of captopril at a gold electrode and its determination in pharmaceuticals and human fluids

2015 ◽  
Vol 7 (20) ◽  
pp. 8673-8682 ◽  
Author(s):  
Nagaraj P. Shetti ◽  
Shweta J. Malode ◽  
Sharanappa T. Nandibewoor
Keyword(s):  
Gold Electrode ◽  
Phosphate Buffer Solution ◽  
Differential Pulse ◽  
Chemical Parameters ◽  
Buffer Solution ◽  
Solution Ph ◽  
Physico Chemical ◽  
Electro Oxidation ◽  
Pulse Voltammetry ◽  
Human Fluids

Gold electrode was used for the oxidation of captopril in phosphate buffer solution pH 3.6 to study the influence of several physico-chemical parameters like potential, scan rate, pH and concentration by cyclic, linear sweep and differential pulse voltammetry.

NiFe2O4nanoparticles decorated with MWCNTs as a selective and sensitive electrochemical sensor for the determination of epinephrine using differential pulse voltammetry

2014 ◽  
Vol 6 (17) ◽  
pp. 6885-6892 ◽  
Author(s):  
Ali A. Ensafi ◽  
F. Saeid ◽  
B. Rezaei ◽  
Ali R. Allafchian
Keyword(s):  
Electrochemical Sensor ◽  
Differential Pulse Voltammetry ◽  
Modified Electrode ◽  
Electrochemical Method ◽  
Differential Pulse ◽  
Synergic Effect ◽  
Pulse Voltammetry

A new electrochemical method was developed for epinephrine detection based on NiFe2O4–MWCNT-modified electrode. The nanocomposite has a synergic effect on the oxidation of epinephrine.

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