Abstract Poly (Tin-doped copper oxide nanocomposites modified glassy carbon electrode) (Poly (Sn-doped CuO nanocomposite)-MGCE) made sensors were confirmed by electrochemical finding of ...norepinephrine (NE). The Sn-doped CuO nanocomposites were made by precipitation technique. This nanocomposite was described through scanning electron microscope and X-ray diffraction methods. To find the doped properties of the Poly (Sn-doped CuO nanocomposite)-MGCE were studied by cyclic voltammetry studies. The above studies prove that the altered electrodes have wide electroactive external area, and the reduction and oxidation peak appeared at pH 7.4 supportive electrolyte concentration 0.2 M phosphate buffer solution. Poly(Sn-doped CuO nanocomposite)-MGCE as limit of detection was low value for NE was found to be 2.22 µM and the limit of quantification values for NE was appeared as 7.41 µM, wide linear range, high sensitivity (20 to 350 µM), functional to the injection mockup analysis and the attained outcomes are acceptable, excellent reproducibility displays excessive potential in practical applications.
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Glycine functionalized multiwalled carbon nanotube composite was prepared by co precipitation method. The prepared glycine functionalized multiwalled carbon nanotube composite was ...characterized with various techniques. The Carbon paste electrode (CPE) was modified with synthesized glycine functionalized multiwalled carbon nanotube composite. The glycine functionalized multiwalled carbon nanotube composite modified CPE is used to study scan rate for the electrode process was controlled by diffusion process. Varying the concentration of Norepinehrine (NE) and evaluated the limit of detection and limit of quantification. pH Studies were carried out and examined the protons and electron ratio involved in the process by using cyclic voltammetry (CV). The method was used for the selective determination of NE in the presence of Ascorbic acid (AA) and the peak to peak difference for NE and AA was sufficient enough for the detection selectively and individually. The glycine functionalized multiwalled carbon nanotube composite modified CPE was extended for the analysis of NE real sample.
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•Pretreated/Carbon paste electrode exhibits significant redox peak currents.•Excellent electrocatalytic activity towards the detection of dopamine.•Acts as electrochemical sensor for ...dopamine in presence of interferences.•The proposed method can be applied for DA in injection and human blood serum samples.
A voltammetric resolution for the determination of dopamine using a Pretreated/Carbon paste electrode was developed. The Pretreated/Carbon paste electrode showed excellent electrocatalytic activity towards the oxidation of dopamine in phosphate buffer solution (pH 7.0). From the electrochemical studies of scan rate, the overall electrode process was diffusion and adsorption controlled. The pH effect suggested that equal number of protons and electrons were involved in the electrochemical detection of dopamine. Detection limit (LOD) was calculated in phosphate buffer solutions at pH 7.0 and the interference studies showed that the modified electrode exhibited excellent selectivity in the presence of large excess of ascorbic acid and uric acid. The separation of the oxidation peak potentials for dopamine–ascorbic acid and dopamine–uric acid was found to be 0.187V and 0.121V, respectively. These differences were large enough to determine dopamine, ascorbic acid and uric acid individually and simultaneously by using cyclic voltammetry and differential pulse voltammetric techniques.
Electrochemical oxidation of dopamine at murexide modified carbon paste electrode was studied by cyclic voltammetric technique in 0.2M phosphate buffer solution at pH 7.4. The modified electrode ...exhibited strong promoting effect and stability toward the detection of dopamine. From the studies of scan rate effect the overall electrode process was found to be diffusion controlled. The concentration effect reveals that the detection limit and quantification limit of dopamine were 1.496×10−7M and 4.988×10−7M respectively. The effect of pH suggested that an equal number of protons and electrons were involved in the electrochemical oxidation of dopamine. The presence of Triton X-100 on the murexide modified carbon paste electrode showed excellent electrocatalytic effect toward the detection of dopamine.
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► Murexide modified carbon paste electrode exhibits increased redox peak currents. ► TX-100/Mu-MCPE exhibits further enhancement in redox peak currents for dopamine. ► It shows high sensitivity, low cost and easy preparation of modified electrode. ► The TX-100/Mu-MCPE acts as electrochemical sensor for the analysis of dopamine.
Electrocatalytic oxidation of dopamine was investigated at 2,4-Dinitrophenyl hydrazine modified carbon paste electrode by using cyclic voltammetric technique. The 2,4-Dinitrophenyl hydrazine modified ...carbon paste electrode was prepared by grinding the mixture of 70% graphite powder and 30% silicon oil (as a binder) with 2mg of 2,4-Dinitrophenyl hydrazine. The modified carbon paste electrode was calibrated with standard potassium ferrocyanide solution in 1M KCl as supporting electrolyte. The modified carbon paste electrode shows good electrocatalytic activity towards dopamine when compare with unmodified carbon paste electrode in 0.2M pyrophosphate buffer solution of pH 7 at scan rate of 100mV/s. The effect of scan rate shows that the electrode process was diffusion controlled. Concentration effect and pH effect were studied.
Electrochemical response of dopamine at alizarin modified carbon paste electrode has been studied by cyclic voltammetric technique in 0.1M acetate buffer solution at pH 7.0. The modified electrode ...exhibited strong promoting effect and stability towards the detection of dopamine. From the studies of scan rate effect the overall electrode process was found to be both adsorption and diffusion controlled. The concentration effect reveals that the detection limit of dopamine was 2.37 x 10-7 M and pH effect suggested that equal number of protons and electrons were involved in the electrochemical oxidation of dopamine. Alizarin modified carbon paste electrode showed excellent electrocatalytic effect towards the detection of dopamine.
Electrochemical behavior of alizarin was investigated at carbon paste electrode in 0.2 M acetate buffer solution at pH 3.5 by using cyclic voltammetric technique (CV). Alizarin showed one oxidation ...peak and two reduction peak between potential range 0 to 1000 mV at scan rate of 50mV/s. The effect of scan rate and concentration was found to be diffusion-controlled electrode process. The electrocatalytic effect of alizarin was dependent on pH. Surfactants effect study showed that the TX-100, a non ionic surfactant has highest electrocatalytic activity towards alizarin.
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