Voltammetric carbon nanotubes based sensor for determination of tryptophan in the milk sample

In this research, functionalized carbon nanotubes were employed to modify a glassy carbon electrode (F-MWCNT/GCE). Several techniques including Fourier Transform Infrared Spectroscopy, scanning electron microscopy, and transmission electron microscopy were utilized for characterization of F-MWCNT. T...

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Bibliographic Details
Published inJournal of food measurement & characterization Vol. 15; no. 6; pp. 5288 - 5295
Main Authors Mehmandoust, Mohammad, Erk, Nevin, Alizadeh, Marzieh, Salmanpour, Sadegh
Format Journal Article
LanguageEnglish
Published New York Springer US 01.12.2021
Springer Nature B.V
Subjects
Anodizing
Carbon
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Differential thermal analysis
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemistry
Electrodes
Electron microscopy
Electrons
Engineering
Food Science
Fourier analysis
Fourier transforms
Glassy carbon
Infrared spectroscopy
Microscopy
Multi wall carbon nanotubes
Nanotechnology
Nanotubes
Original Paper
Oxidation
Scanning electron microscopy
Spectrum analysis
Transmission electron microscopy
Tryptophan
Voltammetry
Carbon nanotube
Tryptophan sensor
Food analysis
Modified electrode
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Summary:In this research, functionalized carbon nanotubes were employed to modify a glassy carbon electrode (F-MWCNT/GCE). Several techniques including Fourier Transform Infrared Spectroscopy, scanning electron microscopy, and transmission electron microscopy were utilized for characterization of F-MWCNT. The electrochemical activity of the developed electrode was assessed by differential pulse voltammetry, cyclic voltammetry, and electrochemical impedance spectroscopy. The electrochemical results demonstrated that oxidation of tryptophan (TRP) caused a higher anodic peak current than unmodified GCE. The F-MWCNT/GCE offered a detection limit of 3.63 nM and dynamic ranges of 0.01–0.7 µM for analysis of TRP by the differential pulse voltammetry method. Moreover, tryptophan detection was achieved successfully using F-MWCNT/GCE in milk samples. It can be stated that this method paves the way for a selective, sensitive and straightforward method to determine tryptophan in the real food sample.
ISSN:2193-4126
2193-4134
DOI:10.1007/s11694-021-01100-8