Electrochemical determination of L-Tryptophan based on a multiwall carbon nanotube/Mg–Al layered double hydroxide modified carbon paste electrode as a sensor

Voltammetric quantification of tryptophan using a MWCNT modified GCE decorated with electrochemically produced nanoparticles of nickel

“…In the present study, a voltammetric nanosensor has been prepared by the modification of a GCE with a composite of MWCNTs and electrochemically produced nickel nanoparticles for the quantification of TRP in food samples. The proposed electrode (NiNPs-MWCNTs/GCE) exhibited a lower detection limit and a very efficient electrocatalytic activity as well as improving the current response in comparison to the reported electrodes [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Also, the proposed electrode was successfully applied for the selective determination of TRP in the presence of potential interfering molecule AA with a higher peak separation as compared to carbon nanotubes-cobalt complex modified GCE [8] and carbon paste electrode [21].…”

“…A linear plot was obtained for current responses of TRP versus the concentrations in the range of 2.0 × 10 −8 -6.5 × 10 −6 M (Fig. 7b) for the quantification of TRP are given in Table 1 for comparison [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Tang et al utilized a carbon paste electrode modified with carbon nanofibers for the determination of TRP with a linear working range from 0.10 M to 100 M yielding a detection limit of 100 nM [19].…”

Electrocatalytic oxidation of l-tyrosine at carboxylic acid functionalized multi-walled carbon nanotubes modified carbon paste electrode

“…In our continual effort to employ CPE and modified CPE for electroanalytical applications [31][32][33][34][35][36][37][38], in the present work, our aim was to fabricate a non-enzymatic sensor for Tyr. To achieve this, we have modified CPE by bulk modifying it using COOH-MWCNTs in the CPE matrix and employed it for the sensitive determination of Tyr in the presence of interfering molecules.…”

Preparation, characterization and electrochemical application of Ag–ZnO nanoplates for voltammetric determination of glutathione and tryptophan using modified carbon paste electrode

“…Electrochemical method of determination is less expensive, more convenient, ease in handling, high sensitive and selective [9][10][11][12][13][14][15].…”