Electrode modified with nitrogen-doped graphene quantum dots supported in chitosan for triclocarban monitoring

Santana, Edson Roberto; Martins, Eduardo Campos; Spinelli, Almir

doi:10.1016/j.microc.2021.106297

Cited by 22 publications

(7 citation statements)

References 53 publications

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“…On the other hand, graphene has been used in electrochemical devices, sensors, biosensors, energy generation, and storage [ 29 ]. In the development of electrochemical sensors, the increased use of graphene is due to the ease of functionalizing graphene surfaces with specific elements of interest [ 29 ]; in this case, chitosan with glassy carbon has the ability to form stable films on surfaces [ 30 , 31 ]. Additionally, the active sites of graphene can be improved with dopants such as boron nitride [ 32 ] and alanine [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Determination of Morin in Natural Food Using a Chitosan–Graphene Glassy Carbon Modified Electrode

Nagles

Bello²,

Hurtado³

2022

Sensors

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This report presents a new application for the chitosan–graphene glassy carbon electrode (Ch-G/GCE) system in the determination of the hydroxyflavonoid morin (MR), one of the flavonoids with the highest favorable activity for people, due to its natural properties by square-wave voltammetry (SWV). The anodic peak current for MR was observed at 0.50 V with an increase of 73% compared with the glassy carbon electrode unmodified. The surface areas of Ch-G/GCE, Ch/GCE and GCE evaluated by cyclic voltammetry were 0.140, 0.053 and 0.011 cm2, respectively. Additionally, an increase greater than 100% compared to the electrode without modification was observed. The detection limit was 0.30 µmol/L for MR, and the relative standard deviations (RSDs) were 1.8% (n = 6). Possible interferences as quercetin, rutin, and applications in real samples were also evaluated with very acceptable results.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Determination of Morin in Natural Food Using a Chitosan–Graphene Glassy Carbon Modified Electrode

Nagles

Bello²,

Hurtado³

2022

Sensors

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“…The fluorescence emission spectra show that the fluorescence of the CDs has no obvious excitation wavelength dependence, and the excitation spectra show that the optimal excitation wavelengths of the CDs are 460, 460 and 370 nm. The emission-independence of carbon dots is attributed to the fact that both the size and the surface state of the sp 2 clusters contained in its structure are uniform [ 35 ]. The 3D spectra are consistent with the PL spectra, and the 3D spectra show that there is a single emission centre for all three CDs ( Figure 4 d–f).…”

Section: Resultsmentioning

confidence: 99%

Preparation of Multicolour Solid Fluorescent Carbon Dots for Light-Emitting Diodes Using Phenylethylamine as a Co-Carbonization Agent

Liu

et al. 2022

IJMS

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Carbon dots (CDs), as a new type of photoluminescent nanomaterial, have attracted extensive attention in various fields because of their unique luminescence properties. However, CDs will exhibit fluorescence quenching in the solid state or aggregate state, which limits their application. In this paper, a unique strategy is proposed to regulate solutions to achieve multicolour fluorescence of CDs in the solid state. We report the successful preparation of orange, green and blue solid fluorescent CDs using citric acid, urea and phenylethylamine as precursors and methanol, ethanol and water as solvents, respectively. The solid-state fluorescence of CDs may be caused by the linkage of the phenylethyl structure to the surface of CDs during formation, which effectively disperses the CDs and prevents π–π interactions between graphitized nuclei. Meanwhile, multicolour solid fluorescent CDs are realized by adjusting the solvent in the preparation process. Based on the excellent fluorescence properties of CDs, orange, green and blue light-emitting diodes (LEDs) are prepared. A white LED (WLED) can be obtained by mixing the three colours of solid fluorescent CDs, which shows the application potential of CDs in display lighting equipment.

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“…In this work, the mixture of MWCNTs-CTAB was first modified on a glassy carbon electrode (GCE), and then the co-cultured mixture of HFs and Lac was added onto the modified electrode and, due to chitosan (Chi), had the ability to form stable films on surfaces [ 43 ]. Finally, a layer of Chi film was modified for electrode protection, so as to construct a biosensor capable of detecting rutin.…”

Section: Introductionmentioning

confidence: 99%

MWCNTs-CTAB and HFs-Lac Nanocomposite-Modified Glassy Carbon Electrode for Rutin Determination

Song

Xiang²,

Xiao³

et al. 2022

Biosensors

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Rutin is a flavonoid glycoside compound, which is mainly transported via the blood circulation system in the human body. The monitoring of the blood concentration of rutin is of great significance in many fields such as pharmacology and pharmacokinetics. In this work, a biosensor based on multi-walled carbon nanotubes (MWCNTs), cetyltrimethylammonium bromide (CTAB), hydroxyl fullerenes (HFs), and laccase (Lac) nanocomposite-modified glassy carbon electrodes was constructed. The modified materials were characterized with a transmission electron microscope (TEM), cyclic voltammograms (CV), and electrochemical impedance spectroscopy (EIS). CTAB is used to disperse MWCNTs and improve hydrophilicity and biocompatibility of MWCNTs, while the use of Lac can enhance the oxidation of catechol structure in rutin, thus significantly improving the sensitivity and selectivity of the modified electrode. Linear sweep voltammetry (LSV) studies showed that the determination linear ranges of rutin were 0.1 µmol L−1 to 2 µmol L−1 and 2 µmol L−1 to 11 µmol L−1, with the determination limits of 30 nmol L−1 and 95.5 nmol L−1, respectively. The proposed biosensor can be used to detect rutin tablets and serum samples with high recovery, which indicates a good accuracy of this method, and the results are consistent with those measured by the traditional ultra-high performance liquid chromatography (UHPLC) method. Hence, this biosensor has potential practical application value in rutin drug quality testing and clinical blood drug concentration monitoring.

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Electrode modified with nitrogen-doped graphene quantum dots supported in chitosan for triclocarban monitoring

Cited by 22 publications

References 53 publications

Electrochemical Determination of Morin in Natural Food Using a Chitosan–Graphene Glassy Carbon Modified Electrode

Electrochemical Determination of Morin in Natural Food Using a Chitosan–Graphene Glassy Carbon Modified Electrode

Preparation of Multicolour Solid Fluorescent Carbon Dots for Light-Emitting Diodes Using Phenylethylamine as a Co-Carbonization Agent

MWCNTs-CTAB and HFs-Lac Nanocomposite-Modified Glassy Carbon Electrode for Rutin Determination

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