Electrocatalytic Oxidation of Tryptophan at Gold Nanoparticle‐Modified Carbon Ionic Liquid Electrode

Safavi, Afsaneh; Momeni, Safieh

doi:10.1002/elan.201000279

Cited by 60 publications

(20 citation statements)

References 46 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%

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%

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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“…Analytical performance of PDA-β-CD-GCE has been compared with other reported electrodes and the results are shown in Table 1 [27][28][29][30][31][32][33][34][35][36][37][38]. Binuclear manganese (II) complex modi ied CPE requires 60.0 s accumulation times prior to the determination of Trp and moreover, the energy required to oxidize Trp at this electrode was more as compared to PDA-β-CD-GCE [28].…”

Section: Resultsmentioning

confidence: 99%

“…The oxidation overpotential at expensive BDD NWs [36] was very high and it required a highly basic medium for the electrocatalytic oxidation of Trp. A two-step procedure was involved in the preparation of GNP/ CILE [37]. The PDA-β-CD-GCE has certain advantages as compared to glassy carbon (GC) electrode modi ied with MWCNTs; GC/MWCNT [38].…”

Section: Resultsmentioning

confidence: 99%

Poly-dopamine-Beta-Cyclodextrin Modified Glassy Carbon Electrode as a Sensor for the Voltammetric Detection of L-Tryptophan at Physiological pH

Hasanzadeh¹

2017

J Forensic Sci Res

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The main purpose of this report was to develop application of poly-dopamine-beta-cyclodextrin modifi ed glassy carbon electrode (PDA-β-CD-GCE) towards electrooxidation and determination of L-Tryptophan (L-Trp) and also the evaluation its kinetic parameters. In continuation of our efforts to use PDA-β-CD-GCE for amino acids detection, our objective in the present work was to expand application of this sensor for the determination of L-Trp which is very sensitive.

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“…To make a distinct comparison with previous literature reported methods, the characteristics of different electrochemical sensors for tryptophan are shown in Table 1. [37][38][39][40][41][42][43][44][45][46] This indicated that the SC4A and cysteamine modified gold electrode was an appropriate platform for the electrochemical determination of tryptophan and had higher sensitivity to tryptophan (Table 1). Figure 9 shows that SC4A had the highest interaction with tryptophan in three SCnA (n = 4, 6, 8).…”

Section: Tryptophan−sc4a Interactionmentioning

confidence: 94%

Supramolecular p-sulfonated calix[4,6,8]arene for tryptophan detection

et al. 2014

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Numerous techniques have focused on the ability of p-sulfonated calix[n]arene to form complexes with tryptophan. Scanning electron microscopy and Fourier transform infrared spectroscopy were utilized to study the organization and molecular structure of different layers of the electrode surface. Scanning electron microscopy results showed that SC4A displayed a cubic structure whereas SC6A and SC8A displayed dendrite structures. The electrochemical properties and potential complex formation between SCnA and tryptophan were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Cyclic voltammetry experiments showed that the gold electrode was successfully functionalized by self-assembled cysteamine and SC4A. Electrochemical impedance spectroscopy results showed the observation of the tryptophan-SCnA interaction and indicated that SC4A had the highest sensitivity to tryptophan and allowed 2.04 g L −1 tryptophan to be detected. Electrochemical impedance spectroscopy analysis and molecular modeling calculation confirmed that SC4A has higher tryptophan sensitivity than SC6A and SC8A.Résumé : De nombreuses techniques ont été axées sur la capacité des calix[n]arènes p-sulfonés à former des complexes avec le tryptophane. La microscopie électronique à balayage et la spectroscopie infrarouge à transformée de Fourier ont été utilisées pour étudier l'organisation et la structure moléculaire de différentes couches de la surface de l'électrode. Les résultats de la microscopie électronique à balayage ont montré que SC4A présentait une structure cubique alors que SC6A et SC8A possédaient des structures dendritiques. Les propriétés électrochimiques et la formation possible d'un complexe entre SCnA et le tryptophane ont été caracté-risées par voltammétrie cyclique et spectroscopie d'impédance électrochimique. Les expériences de voltammétrie cyclique ont montré que l'électrode en or était fonctionnalisée avec succès par autoassemblage de cystéamine et de SC4A. Les résultats de la spectroscopie d'impédance électrochimique ont permis d'observer l'interaction tryptophane-SCnA et ont révélé que SC4A avait une sensibilité élevée au tryptophane et qu'une concentration en tryptophane de 2,04 g L −1 pouvait être détectée de cette technique d'analyse. Les calculs de modélisation moléculaire et les résultats de la spectroscopie d'impédance électrochimique ont confirmé que SC4A présentait une plus grande sensibilité au tryptophane que SC6A et SC8A. [Traduit par la Rédaction] Mots-clés : spectroscopie infrarouge à transformée de Fourier, calculs de modélisation moléculaire, voltammétrie cyclique, spectroscopie d'impédance électrochimique, microscopie électronique à balayage.

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Electrocatalytic Oxidation of Tryptophan at Gold Nanoparticle‐Modified Carbon Ionic Liquid Electrode

Cited by 60 publications

References 46 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

Poly-dopamine-Beta-Cyclodextrin Modified Glassy Carbon Electrode as a Sensor for the Voltammetric Detection of L-Tryptophan at Physiological pH

Supramolecular p-sulfonated calix[4,6,8]arene for tryptophan detection

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