An electrochemical sensor for determination of tryptophan in the presence of DA based on poly(<scp>l</scp>-methionine)/graphene modified electrode

Wang, Yingzi; Ouyang, Xiaoqian; Ding, Yaping; Liu, Bingdi; Xu, Duo; Liao, Lanfeng

doi:10.1039/c5ra24116b

Cited by 58 publications

(26 citation statements)

References 42 publications

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“…Modification of the electrodes with mediators decreases working potential and improves performance of the sensor due to electrocatalytic effect and higher specific surface area. Thus, hemin , carbon nanotubes , ferrocene , Au nanoparticles , acetylene black , taken alone or in combination and included in electropolymerized matrices have been successfully used in the assembly of voltammetric sensors for the Trp determination. Although many of the above sensors show excellent sensitivity, the deposition of the sensing layer often involves several steps with rather complicated intermediate treatment of the surface.…”

Section: Introductionmentioning

confidence: 99%

“…Silver nanoparticles have been intensively investigated during the past decade in electrochemical sensing of many species like antioxidants, dyes, and drugs and especially hydrogen peroxide . They show diversity of electrochemical and chemical reactions useful for distinguishing various analytes.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, further efforts in searching new mediators for the Trp detection are needed. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Silver nanoparticles have been intensively investigated during the past decade in electrochemical sensing of many species like antioxidants, dyes, and drugs [21][22][23][24][25] and especially hydrogen peroxide [26][27][28][29]. They show diversity of electrochemical and chemical reactions useful for distinguishing various analytes.…”

Section: Introductionmentioning

confidence: 99%

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Glassy Carbon Electrode Modified with Silver Nanodendrites Implemented in Polylactide‐Thiacalix[4]arene Copolymer for the Electrochemical Determination of Tryptophan

et al. 2017

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Glassy carbon electrode (GCE) was modified by new polymeric materials obtained from oligolactides by cross‐linking with tetracarboxylated thiacalix[4]arene in cone, partial cone and 1,3‐alternate configurations and then silver was deposited by potential cycling in the pores of the polymer film. The modified electrode showed highly sensitive and selective signal toward tryptophan which was irreversibly oxidized on the coating due to Ag+ assisted accumulation in the surface layer. The role of macrocycle configuration and conditions for Ag nanodendrites formation are described. Granulation of the polymer films caused by the macrocycles improves both the conditions for silver deposition and tryptophan determination. The electrochemical sensor developed makes it possible to determine from 0.1 to 100 μM of tryptophan with the limit of detection down to 0.03 μM. No interference with oxidation of other amino acids (phenylalanine, histidine, cysteine and tyrosine) was found. The electrochemical sensor developed was validated in the determination of tryptophan sedative medication “Formula of calmness” in the presence of vitamins B5 and B6.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Glassy Carbon Electrode Modified with Silver Nanodendrites Implemented in Polylactide‐Thiacalix[4]arene Copolymer for the Electrochemical Determination of Tryptophan

et al. 2017

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“…Tryptophan (Try) is an essential amino acid that mainly presented in peanuts, pumpkin seeds, eggs, chocolate, sunflower seeds, bananas, cheese, red meat, sesame, milk, yogurt and dried dates. 1 In addition, Try is an alanine derivative that containing indole ring on the ß carbon which played vital role in the field of bio-chemistry. 2 Try has nutritional, clinical and biochemical importance in herbivores and humans.…”

mentioning

confidence: 99%

A Simple and Rapid Electrochemical Determination of L-Tryptophan Based on Functionalized Carbon Black/Poly-L-Histidine Nanocomposite

Sakthivel

Mutharani

Chen

et al. 2018

J. Electrochem. Soc.

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In the present work, the functionalized carbon black/poly-l-histidine modified glassy carbon electrode (f-CB/PLH/GCE) was fabricated and applied for the amperometric determination of Try. The proposed modified electrode was prepared by non-hazardous, inexpensive, simple electro polymerization method. The successful formation of f-CB/PLH composite was scrutinized by field-emission scanning electron microscopy, transmission electron microscopy, optical microscope, energy dispersive X-ray spectroscopy, Fourier transform infra-red spectroscopy, Raman spectroscopy and electrochemical impendence spectroscopy. Besides, the electrocatalytic activity of the f-CB/PLH composite was examined by cyclic voltammetry and amperometric techniques. Remarkably, the wide linear range responses from 0.025-124.98 μM with the lowest detection limit 0.008 μM and an appreciable sensitivity of 1.126 μA mM −1 cm −2 was obtained. In addition, f-CB/PLH/GCE exhibits the good selectivity in presence of various inorganic, biological and co-existing interfering compounds. Furthermore, the practical feasibility of the sensor electrode was demonstrated in milk and human urine samples.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 61.220.116.134 Downloaded on 2018-07-12 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 61.220.116.134 Downloaded on 2018-07-12 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 61.220.116.134 Downloaded on 2018-07-12 to IP B428Journal of The Electrochemical Society, 165 (10) B422-B430 (2018) ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 61.220.116.134 Downloaded on 2018-07-12 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see

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“…Trp has to exist in human nutrition owing to be an essential amino acid and keeping the nitrogen level balanced in human beings [1]. However, the high intake or improper metabolism of Trp can result in waste products in the brain causing hallucinations, delusions,and schizophrenia [2]. Therefore, developing a convenient, rapid, and inexpensive method with high selectivity and sensitivity for the determination of Trp would be desirable in a variety of fields such as food processing, biochemistry, pharmaceutical industry, and clinical analysis [3,4].…”

Section: Introductionmentioning

confidence: 99%

Application of carboxylic acid-functionalized of graphene oxide for electrochemical simultaneous determination of tryptophan and tyrosine in milk

Fooladi¹,

Razavizadeh²,

Noori³

et al. 2020

SN Appl. Sci.

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In this work, a new method for the simultaneous determination of tryptophan (Trp) and tyrosine (Tyr) in milk has been reported. Trp and Tyr are essential amino acids in human nutrition, but their electrochemical signal overlapped. For solve this problem, we developed modified Screen Printed Carbon Electrode (SPCE) with Graphene Oxide-COOH/Chitosan (GO-COOH/Chitosan) electro-deposition. The morphology and electrochemical performance of modified electrode were characterized by scanning electron microscopy, energy dispersive spectrometry, FT-IR, electrochemical impedance spectroscopy and cyclic voltammetry. The electrochemical simultaneous determination of Trp and Tyr has been investigated by using differential pulse voltammetry. The carboxylic acid functionalized GO modified SPCE was utilized to catalyze the oxidation of Trp and Tyr. Compared with SPCE/GO/Chitosan and SPCE/Chitosan sensor, the new sensor has enhanced sensitivity, low detection limit and high selectivity. In addition, the SPCE/GO-COOH-Chitosan sensor enhanced separation of the oxidation peak of Tyr and Trp and showed a remarkable increase in peak current for electroactive compounds, thus, it can be used for simultaneous voltammetric determination. Under the optimized experimental conditions, a linear correlation between oxidation peak current and concentration of Tyr and Trp in the ranges 0.1-60 µM and 0.4-40 µM with a detection limit of 0.05 µM (S/N = 3) and 0.1 µM (S/N = 3) were achieved, respectively. Finally, the proposed electrochemical sensor was applied for quantification of Tyr and Trp in milk samples, where standard solutions were spiked to the milk samples and recoveries were obtained.

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An electrochemical sensor for determination of tryptophan in the presence of DA based on poly(l-methionine)/graphene modified electrode

Abstract: Electrocatalytic oxidation of l-Trp at poly(l-methionine)/graphene composite film modified glassy carbon electrode (PLME/GR/GCE) were investigated by differential pulse voltammetry.

Cited by 58 publications

References 42 publications

Glassy Carbon Electrode Modified with Silver Nanodendrites Implemented in Polylactide‐Thiacalix[4]arene Copolymer for the Electrochemical Determination of Tryptophan

Glassy Carbon Electrode Modified with Silver Nanodendrites Implemented in Polylactide‐Thiacalix[4]arene Copolymer for the Electrochemical Determination of Tryptophan

A Simple and Rapid Electrochemical Determination of L-Tryptophan Based on Functionalized Carbon Black/Poly-L-Histidine Nanocomposite

Application of carboxylic acid-functionalized of graphene oxide for electrochemical simultaneous determination of tryptophan and tyrosine in milk

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