One-pot synthesis of graphene oxide coated with sol–gel for electrochemical determination of tryptophan

Kim, Songjin; Sun, Si; Li, Yijun; He, Xiwen

doi:10.1039/c5ay01190f

Cited by 6 publications

(4 citation statements)

References 56 publications

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“…Finally, the nucleophilic attack by Trp itself results in the formation the dimer [Structure (5) in Scheme ]. , …”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the oxidation of Trp at ND-CN550/GCE can be ascribed to the 2e – /1H + transfer mechanism, as previously reported. 34 , 35 Scheme 1 depicts the proposed mechanism. During the anodic process of Trp at ND-CN/GCE, the first step comprises the formation of a radical cation by one-electron (1e−) removal [Structure (2) in Scheme 1 ].…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the oxidation of Trp at ND-CN550/GCE can be ascribed to the 2e − /1H + transfer mechanism, as previously reported. 34,35 . 34,36 Effects of Scan Rate.…”

mentioning

confidence: 99%

“…34,35 . 34,36 Effects of Scan Rate. The electrode process of Trp at ND-CN550/GCE was studied by examining the relationship between the oxidation current and scan rate.…”

mentioning

confidence: 99%

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Nitrogen Defect-Rich Graphitic Carbon Nitride for Highly Sensitive Voltammetric Determination of Tryptophan

Mihret,

Sisay,

Diro

et al. 2023

ACS Omega

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Here, a highly sensitive electrochemical sensor for detection of tryptophan (Trp) using a nitrogen defect graphitic carbon nitride-modified glassy carbon electrode (ND-CN/GCE) was introduced. ND-CN/GCE showed a higher oxidation current for Trp than the graphitic carbon nitride-modified glassy carbon electrode ( g -CN/GCE) and bare glassy carbon electrode (BGCE). The synthesized nitrogen defect-rich graphitic carbon nitride (ND-CN) was characterized using X-ray photoelectron spectroscopy, X-ray diffraction spectroscopy, Fourier-transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. Electrochemical impedance spectroscopy and cyclic voltammetry were used to further analyze the electrochemical properties of BGCE, g -CN/GCE, and ND-CN/GCE. The oxidation of Trp at ND-CN/GCE is a diffusion-controlled process at pH 3.0. It was calculated that the transfer coefficient, rate constant, and diffusion coefficient of Trp were 0.53, 2.24 × 10 3 M –1 s –1 , and 8.3 × 10 –3 cm 2 s –1 , respectively, at ND-CN/GCE. Trp was detected using square wave voltammetry, which had a linear range from 0.01 to 40 μM at pH 3.0 and a limit of detection of about 0.0034 μM (3σ/ m ). Analyzing the presence of Trp in a milk and multivitamin tablet sample with a percentage recovery in the range of 97.0–108% satisfactorily demonstrated the practical usability of the electrochemical sensor. The ND-CN/GCE additionally displays good repeatability and reproducibility and satisfactory selectivity.

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“…Finally, the nucleophilic attack by Trp itself results in the formation the dimer [Structure (5) in Scheme ]. , …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Consequently, the oxidation of Trp at ND-CN550/GCE can be ascribed to the 2e − /1H + transfer mechanism, as previously reported. 34,35 . 34,36 Effects of Scan Rate.…”

mentioning

confidence: 99%

“…34,35 . 34,36 Effects of Scan Rate. The electrode process of Trp at ND-CN550/GCE was studied by examining the relationship between the oxidation current and scan rate.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Nitrogen Defect-Rich Graphitic Carbon Nitride for Highly Sensitive Voltammetric Determination of Tryptophan

Mihret,

Sisay,

Diro

et al. 2023

ACS Omega

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Electrochemical detection of tryptophan in fish and pharmaceutical supplement at glassy carbon electrode modified with Fe doped ZnO nanoparticle

Teshome,

Addisu Kitte,

Gure

et al. 2023

Electroanalysis

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The co‐precipitation approach was employed in this study to create Fe doped ZnO (Fe‐ZnO) nanoparticles (NPs). To characterize the synthesized NPs, Ultra violet‐Visible (UV‐Vis) spectroscopy, X‐ray diffraction (XRD), fourier transform infrared (FT‐IR), scanning electron microscopy (SEM), and Brunauer‐Emmett‐Teller (BET) were used. Here, a novel electrochemical approach for the detection of tryptophan (Trp) using a glassy carbon electrode modified with Fe‐ZnO NPs (Fe‐ZnO/GCE) is demonstrated. The research findings revealed that Fe‐ZnO/GCE enhanced the electron transfer rate of Trp oxidation. The sensitivity of Trp detection using Fe‐ZnO/GCE in phosphate buffer solution (PBS) at pH 64.0 was significantly improved compared to bare GCE due to the electrocatalytic activity of Fe‐ZnO NPs. Fe‐ZnO/GCE exhibited a linear response with Trp concentrations ranging from 0.1 to 150 μM with the limit of detection (LOD) is 0.089 μM (3σ/m) and limit of quantification (LOQ) about 0.3 μM (10σ/m) using linear sweep voltammetry (LSV). The Fe‐ZnO/GCE sensor was also effectively used to detect Trp in African catfish and multivitamin tablets. Trp analysis in real samples exhibited good recovery values of 89.60 to 99.15 %, demonstrating the accuracy and practicality of the method.

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Fabrication of silver-grafted silica nanohybrids via aminosilane-inspired surface functionalization for enhanced electrochemical performance towards gastric cancer biomarker

Bhattacharjee

Subha

Das

et al. 2021

Applied Surface Science

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One-pot synthesis of graphene oxide coated with sol–gel for electrochemical determination of tryptophan

Cited by 6 publications

References 56 publications

Nitrogen Defect-Rich Graphitic Carbon Nitride for Highly Sensitive Voltammetric Determination of Tryptophan

Nitrogen Defect-Rich Graphitic Carbon Nitride for Highly Sensitive Voltammetric Determination of Tryptophan

Electrochemical detection of tryptophan in fish and pharmaceutical supplement at glassy carbon electrode modified with Fe doped ZnO nanoparticle

Fabrication of silver-grafted silica nanohybrids via aminosilane-inspired surface functionalization for enhanced electrochemical performance towards gastric cancer biomarker

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