Effect of surface modification of indium tin oxide by nanoparticles on the electrochemical determination of tryptophan

Goyal, Rajendra N.; Bishnoi, Sunita; Chasta, Himanshu; Aziz, Md. Abdul; Oyama, Munetaka

doi:10.1016/j.talanta.2011.08.031

Cited by 57 publications

(33 citation statements)

References 45 publications

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“…3). An obvious irreversible electro-oxidation peak for Trp was observed during the different steps of the modification which were in agreement with the findings of previous studies [13,14,31]. Schematic representation of oxidation mechanism of Trp on the modified electrode is shown in Scheme 1.…”

Section: Cyclic Voltammetric Behavior Of Trp On the Cs-cnds/gcesupporting

confidence: 91%

“…On the other hand, electrochemical method of determination is less expensive, more convenient, easy in handling, as well as with high sensitivity and selectivity. Several studies have been conducted in this area [8][9][10][11][12][13][14]. The results of such studies have revealed that the voltammetric response of the electrochemical process is not satisfactory due to slow heterogeneous electron transfer on the electrode surface and consequent high overpotentials of the electrochemical oxidation [15,16].…”

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confidence: 99%

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Novel electrochemical sensor based on carbon nanodots/chitosan nanocomposite for the detection of tryptophan

Roushani

Sarabaegi

2015

J IRAN CHEM SOC

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formulations to supplement the current typical diet which is deficient in vegetables. Improper metabolization of Trp may lead to a waste product in the brain or cause hallucination and delusion [3]. Hence, the sensitive and selective determination of Trp is highly essential. Several methods have been reported for the determination of Trp in biological and pharmaceutical samples such as high-performance liquid chromatography [4], spectrophotometry [5], fluorimetry [6] and capillary electrophoresis [7]. Although these methods are successfully used to determine Trp, they have several drawbacks including long analysis time, poor reproducibility, pre-cleaning of the matrix, pre-treatment of the sample and low detection limits. On the other hand, electrochemical method of determination is less expensive, more convenient, easy in handling, as well as with high sensitivity and selectivity. Several studies have been conducted in this area [8][9][10][11][12][13][14]. The results of such studies have revealed that the voltammetric response of the electrochemical process is not satisfactory due to slow heterogeneous electron transfer on the electrode surface and consequent high overpotentials of the electrochemical oxidation [15,16]. Therefore, one of the main challenges in this field is to select the suitable materials for the electrode surface modification that can increase the direct electron transfer between the electrode surface and redox molecule.Among different nanomaterials, carbon nanomaterials have attracted great interest in electroanalytical investigations because of their chemical and mechanical properties, wide potential window, and suitability for different types of analysis [17,18]. Given these unique properties, carbon nanomaterials such as carbon nanotubes (CNTs) [19][20][21], fullerene-C 60 [22], carbon nanofibers (CNFs) [23][24][25], and CNDs [26] have been widely used for modification of the electrode's surface. As new and interesting members of carbon family, CNDs have attracted great attention due to their Abstract A modified glassy carbon electrode (GCE) was prepared by incorporating carbon nanodots (CNDs) and chitosan (CS) for the determination of tryptophan (Trp). In this method, the electrochemical response of Trp was examined and the irreversible electrochemical oxidation and two electrons involved in the process of Trp were demonstrated. Because of good conductivity, large surface area, and excellent catalytic activity of CNDs, the CS and CNDs hybrid film extremely increased the electrochemical response of Trp, offering a highly sensitive electrochemical sensor for determination of Trp. The sensor showed a low detection limit of 90 nM and high sensitivity of 4 nA µM −1 . The high stability and simplicity of prepared nanohybrid combined with excellent sensitivity and selectivity of the sensor may bring novel and interesting applications for different diagnoses. As a way forward, the proposed methodology is promised for fabrication of the other effective and sensitive sensors

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Section: Cyclic Voltammetric Behavior Of Trp On the Cs-cnds/gcesupporting

confidence: 91%

mentioning

confidence: 99%

Novel electrochemical sensor based on carbon nanodots/chitosan nanocomposite for the detection of tryptophan

Roushani

Sarabaegi

2015

J IRAN CHEM SOC

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“…This would be a noticeable difference from the electrode modification of other carbon materials, such as fullerenes 64,65 and carbon nanotubes. [66][67][68] However, the variety of techniques available also suggests that there is no established method for electrode surface modification at present. It seems that each research group adopts their own methodology.…”

Section: Characteristic Features In the Preparations Of Mnp-rgo 5·1 Rmentioning

confidence: 99%

Recent Nanoarchitectures in Metal Nanoparticle-Graphene Nanocomposite Modified Electrodes for Electroanalysis

Oyama

Chen

2014

ANAL. SCI.

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While increasing attention has been devoted to the use of carbon-based nanomaterials or metal nanoparticles (MNPs) as electrode modifiers for electroanalysis, there is a noticeable development in studies using MNP-graphene nanocomposites or nanohybrids in very recent years. In this review, first, very recent nanoarchitectures in MNP-graphene nanocomposites for modifying electrodes (mainly in 2013) are summarized together with the targets and achievements of electroanalysis. The variety of nanoarchitectures comes from the fact that graphene oxide and metal precursor ions can be reduced chemically or electrochemically, and concurrently or stepwisely. By browsing various preparation methods of the modified electrodes, some characteristic and interesting features of the preparations of MNP-graphene nanocomposites are described together with the possibilities and prospects as electrode modifiers for electroanalysis.

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“…Trp acts as precursor for serotonin, melatonin and niacin [7]. Improper metabolism of Trp accumulates toxic products in brain which causes hallucinations, delusions and schizophrenia [8]. An overdose of Trp creates drowsiness, nausea, dizziness and loss of appetite [9].…”

Section: Introductionmentioning

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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Effect of surface modification of indium tin oxide by nanoparticles on the electrochemical determination of tryptophan

Cited by 57 publications

References 45 publications

Novel electrochemical sensor based on carbon nanodots/chitosan nanocomposite for the detection of tryptophan

Novel electrochemical sensor based on carbon nanodots/chitosan nanocomposite for the detection of tryptophan

Recent Nanoarchitectures in Metal Nanoparticle-Graphene Nanocomposite Modified Electrodes for Electroanalysis

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

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