Quantum chemical and electrochemical studies of lysine modified carbon paste electrode surfaces for sensing dopamine

Jayaprakash, Gururaj Kudur; Swamy, B.E. Kumara; González-Ramírez, Henry Nicole; Ekanthappa, Musturappa Tumbre; Flores‐Moreno, Roberto

doi:10.1039/c7nj04998f

Cited by 35 publications

(13 citation statements)

References 50 publications

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“…As a comparison, the voltammogram of the unmodified CPE shows a small broad peak, which is difficult to assign to a redox reaction associated with Cd(II) at the electrode surface. However, this small anodic peak provides evidence of the absence of a significant pre-concentration, and as a consequence limited diffusion of Cd(II) on the bare electrode, where the electron transfer will take place on the first layer of graphite [ 43 ]. On the other hand, the distinguished and remarkable enhancement of the oxidation peak of cadmium obtained with the modified electrode was due to the high surface area of the swollen PAA-co-IA/NaOH/B-MWCNT hydrogel, which possessed more active sites that could promote the adsorption and electron transfer between the electrode and analyte.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Bamboo-like Multiwall Carbon Nanotube–Poly(Acrylic Acid-co-Itaconic Acid)/NaOH Composite Hydrogel and its Potential Application for Electrochemical Detection of Cadmium(II)

et al. 2020

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A poly(acrylic acid-co-itaconic acid) (PAA-co-IA)/NaOH hydrogel containing bamboo-type multiwall carbon nanotubes (B-MWCNTs) doped with nitrogen (PAA-co-IA/NaOH/B-MWCNTs) was synthesized and characterized by SEM, absorption of water, point of zero charges, infrared spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. The possible use of the PAA-co-IA/NaOH/B-MWCNT hydrogel as an electrode modifier and pre-concentrator agent for Cd(II) sensing purposes was then evaluated using carbon paste electrodes via differential pulse voltammetry. The presence of the B-MWCNTs in the hydrogel matrix decreased its degree of swelling, stabilized the structure of the swollen gel, and favored the detection of 3 ppb Cd(II), which is comparable to the World Health Organization’s allowable maximum value in drinking water. A calibration curve was obtained in the concentration range of 2.67 × 10−8 to 6.23 × 10−7 M (i.e., 3 and 70 ppb) to determine a limit of detection (LOD) of 19.24 μgL−1 and a sensitivity of 0.15 μC ppb−1. Also, the Zn(II), Hg(II), Pb(II) and Cu(II) ions interfered moderately on the determination of Cd(II).

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Section: Resultsmentioning

confidence: 99%

Synthesis of Bamboo-like Multiwall Carbon Nanotube–Poly(Acrylic Acid-co-Itaconic Acid)/NaOH Composite Hydrogel and its Potential Application for Electrochemical Detection of Cadmium(II)

et al. 2020

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“…have already been reported. Modification of a sensing electrode is usually performed to improve the sensing properties of electrode [28][29][30][31][32][33][34][35].…”

Section: A D V a N C E D O N L I N E A R T I C L Ementioning

confidence: 99%

Poly (DL-valine) electro-polymerized carbon nanotube paste sensor for determination of antihistamine drug cetirizine

Tigari

Manjunatha

Pushpanjali

et al. 2020

J. Electrochem. Sci. Eng.

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Poly (DL-valine) modified multiwalled carbon nanotube paste sensor (PVLMCNTPS) was prepared by electro-polymerization route. PVLMCNTPS and bare multiwalled carbon nanotube paste sensor (BMCNTPS) morphologies and sensing properties for cetirizine (CTZ) were confirmed through a field emission scanning electron microscope (FE-SEM) and electrochemical studies, respectively. In contrast to BMCNTPS, PVLMCNTPS surface composite creates an electrocatalytic impact on the oxidation of CTZ. PVLMCNTPS properties were optimized using parameters such as accumulation time, number of polymerization cycles, solution pH, and scan rate. The optimized PVLMCNTPS was applied for the determination of cetirizine in 0.1 M phosphate buffer solution (PBS) of pH 7.0, using cyclic voltammetry (CV). It is shown that PVLMCNTPS provided analytical linearity from 2.0 to 80 µM, with a detection limit of 0.11 µM for CTZ determination. PVLMCNTPS is found highly selective for CTZ in presence of some interfering organic molecules. The stable and selective PVLMCNTPS was applied for CTZ determination in pharmaceutical pills with satisfactory results.

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“…From curve b it is obvious that the oxidation peak current and oxidation peak potential responses were not revealed in the absence of IS (curve b) but under alike condition, in the presence of IS (curve a), an improved voltammetry response is observed. [28][29][30]…”

Section: Electrochemical Behaviour Of Is At Sdsmcntpementioning

confidence: 99%

Sodium Dodecyl Sulfate Modified Carbon Nano Tube Paste Electrode for Sensitive Cyclic Voltammetry Determination of Isatin

et al. 2020

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Purpose: Isatin (IS) is a synthetically significant heterocyclic moiety with an influential pharmacodynamic indole nucleus and hence the electrocatalytic property of has been investigated. Methods: The electrochemical analysis was demonstrated by cyclic voltammetry (CV) in the potential window of 0.2 V to 1.4 V using sodium dodecyl sulfate (SDS) modified carbon nano tube paste electrode (SDSMCNTPE) over a pH range of 6 to 8.5 in 0.2 M phosphate buffer solution (PBS). Surface morphology was studied by using Field emission-scanning electron microscopy (FESEM). Results: The CV study discloses that under ideal condition oxidation of IS arises at a potential of 0.970 V accompanied with an exceptional stability, selectivity and sensitivity for the resultant SDSMCNTPE contrasting to bare carbon nano tube paste electrode (BCNTPE). Individual parameters like electrode surface area, effect of surfactant, detection limit, simultaneous detection of IS and resorcinol (RC) were studied at a scan rate of 0.1 V/s. Scan rate study uncovers the process is diffusion controlled. The oxidation peak current amplified linearly with the surge in concentration of IS under ideal condition. Detection limit (LOD) and limit of quantification (LOQ) in the solution of optimum pH (7.5) at a scan rate of 0.100V/s is 2.4×10-7 M and 8.2 × 10-7 M respectively. Conclusion: The proposed electrode portrays excellent repeatability, reproducibility and reliability to resistant electrode fouling.

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Quantum chemical and electrochemical studies of lysine modified carbon paste electrode surfaces for sensing dopamine

Abstract: We have improved the sensitivity of a carbon paste electrode from lysine for the sensitive detection of dopamine.

Cited by 35 publications

References 50 publications

Synthesis of Bamboo-like Multiwall Carbon Nanotube–Poly(Acrylic Acid-co-Itaconic Acid)/NaOH Composite Hydrogel and its Potential Application for Electrochemical Detection of Cadmium(II)

Synthesis of Bamboo-like Multiwall Carbon Nanotube–Poly(Acrylic Acid-co-Itaconic Acid)/NaOH Composite Hydrogel and its Potential Application for Electrochemical Detection of Cadmium(II)

Poly (DL-valine) electro-polymerized carbon nanotube paste sensor for determination of antihistamine drug cetirizine

Sodium Dodecyl Sulfate Modified Carbon Nano Tube Paste Electrode for Sensitive Cyclic Voltammetry Determination of Isatin

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