Carbon paste electrode modified with Fe3O4 nanoparticles and BMI.PF6 ionic liquid for determination of estrone by square-wave voltammetry

Moreira, Fernanda Kempner; Maranhão, Tatiane de Andrade; Spinelli, Almir

doi:10.1007/s10008-017-3678-0

Cited by 14 publications

(14 citation statements)

References 49 publications

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“…Based on the results discussed above, the electrochemical oxidation of E2 mainly produces quinone through an irreversible electrochemical reaction involving the transfer of 2 moles of protons and 2 moles of electrons, with www.nature.com/scientificreports www.nature.com/scientificreports/ the presence of coupled chemical reactions, as reported in other studies in the literature. The same behavior was verified for E3 7,10,21 . Figure 5 shows the proposed reaction for E2 and E3 oxidation at Fe 3 O 4 NPs-BMI.PF 6 /CPE.…”

Section: Resultssupporting

confidence: 75%

“…The samples were stored in a vacuum desiccator at room temperature for 12 h. The zeta experiments were performed using a Zetasizer preparation of electrodes. The Fe 3 O 4 NPs-BMI.PF 6 /CPE was prepared according to the optimized conditions in a 3 2 factorial design previously described 21 . A paste with a mass of 200.0 mg was prepared by mixing 133.0 mg of graphite powder and 7.0 mg of the Fe 3 O 4 NPs for 10 min until a uniform blend was obtained.…”

Section: Characterization Of the Materials For The Morphological Chamentioning

confidence: 99%

“…Another class of compounds that has attracted the attention of researchers as modifiers of electrodes are ionic liquids because of their high ionic conductivity, good chemical and thermal stability, wide electrochemical potential window and catalytic activity 20 . In our group, Moreira and co-authors 21 optimized the conditions in a 3 2 factorial design in the development of a Fe 3 O 4 NPs and ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (BMI.PF 6 ) modified CPE. This electrode was employed for the electroanalytical determination of estrone (E1) in pork meat samples by square-wave voltammetry (SWV).…”

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confidence: 99%

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Ionic liquid-supported magnetite nanoparticles as electrode modifier materials for estrogens sensing

Moreira

Santana

Spinelli

2020

Sci Rep

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Section: Resultssupporting

confidence: 75%

Section: Characterization Of the Materials For The Morphological Chamentioning

confidence: 99%

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confidence: 99%

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Ionic liquid-supported magnetite nanoparticles as electrode modifier materials for estrogens sensing

Moreira

Santana

Spinelli

2020

Sci Rep

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“…So, its detection is important for human health and environmental concern. Possible electrochemical oxidation of EN at carbon electrode [144] is shown in Figure 3.…”

Section: Electrochemical Sensing Of Estronementioning

confidence: 99%

Research developments in carbon materials based sensors for determination of hormones

Manjunatha

Tigari

Hareesha

et al. 2021

J. Electrochem. Sci. Eng.

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Various carbon-based sensors (graphene, carbon nanotubes, graphite, pencil graphite, glassy carbon, etc.) have distinctive behavior and a broad range of importance for identifying sex hormones like estriol, estradiol, estrone, progesterone, and testosterone. The current review emphasizes voltammetric, amperometric, and electrochemical impedance spectroscopic methods for detecting some of these hormones. The existence, structural aspects, nature, and biological importance of each hormone were analyzed in detail and their analysis with different electroanalytical methods was considered. Unique methodologies and innovations of electrochemical sensors for hormones based on carbon materials modified by different agents were examined. In this review, the interaction among various sensor materials and analytes in different supporting electrolyte media is premeditated. The most important significances of the electroanalytical methodologies were discussed based on sensor selectivity, sensitivity, stability, the limit of detection, repeatability, and reproducibility.

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“…In the last decades, ionic liquids have been used as electrolytes of electrochemical devices showing quite promising results due to their good ionic conductivity, wide electrochemical window, and high thermal stability [11][12][13][14][15][16] . In particular, the tetrafluoroborate of 3-triethylammonium-propane sulfonic acid ionic liquid (TEA-PS.BF 4 ) was successfully applied in water electrolysis 1,[17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

Effect of different carbon supports for Ni particles for the HER in tetra‐alkylammonium‐sulfonic acid media

et al. 2019

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Summary Vitreous carbon (VC) and pyrolytic carbon (PC) were covered by nickel particles through sputter deposition, consisting in the Ni/VC and Ni/PC electrodes, respectively. These materials were tested as cathodes in an aqueous solution of tetrafluoroborate of the 3‐triethylammonium‐propane sulfonic acid ionic liquid (TEA‐PS.BF4) for hydrogen production and characterized by scanning electron microscopy (SEM), chronoamperometry (CA), linear and cyclic voltammetry (LV and CV), and electrochemical impedance spectroscopy (EIS). The mechanism of the hydrogen evolution reaction (HER) was that of Volmer‐Heyrovsky for all the cathodes tested, and the H2 desorption at the catalytic surface is the determining step. The results indicate that different carbon supports can affect the efficiency of the particulate electrocatalyst deposited on it. The low values of H+ adsorption and the H2 desorption resistances of the modified PC system (0.43 and 0.8 Ω cm2, respectively), in relation to the modified VC system (1.13 and 7.9 Ω cm2, respectively), attest that Ni particles presence on PC favored the adsorption of H+ and H2 nanobubble desorption. The Ni particles on PC increase exchange current density (80.5 μA cm2 for Ni/PC cathode about 38.3 Ω cm2 for Ni/VC cathode) and enhance catalytic activity. These results can be attributed to the faster liberation of the active sites due to the interaction between the Ni particles and the PC support. In addition, the TEA‐PS.BF4 solution can act as a stripper, avoiding the formation of passive oxides in the open circuit and preventing the deactivation of the electrocatalyst.

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Carbon paste electrode modified with Fe3O4 nanoparticles and BMI.PF6 ionic liquid for determination of estrone by square-wave voltammetry

Cited by 14 publications

References 49 publications

Ionic liquid-supported magnetite nanoparticles as electrode modifier materials for estrogens sensing

Ionic liquid-supported magnetite nanoparticles as electrode modifier materials for estrogens sensing

Research developments in carbon materials based sensors for determination of hormones

Effect of different carbon supports for Ni particles for the HER in tetra‐alkylammonium‐sulfonic acid media

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