Izvorni znanstveni članak
https://doi.org/10.5599/jese.576
Application of Fe3O4@SiO2/GO nanocomposite for sensitive and selective electrochemical sensing of tryptophan
Hadi Beitollahi
; Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
Mohadeseh Safaei
; Department of Chemistry, Faculty of Sciences, Islamic Azad University, Yazd Branch, Yazd, Iran
Masoud Reza Shishehbore
; Department of Chemistry, Faculty of Sciences, Islamic Azad University, Yazd Branch, Yazd, Iran
Somayeh Tajik
; NanoBioElectrochemistry Center, Bam University of Medical Sciences, Bam, Iran
Sažetak
A simple strategy for determination of tryptophan (TRP) based on Fe3O4@SiO2/GO nanocomposite modified graphite screen printed electrode (Fe3O4@SiO2/GO/SPE) is reported. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to characterize the performance of the sensor. The Fe3O4@SiO2/GO/SPE displayed excellent electrochemical catalytic activities. The oxidation overpotentials of tryptophan decreased significantly and its oxidation peak current increased dramatically at Fe3O4@SiO2/GO/SPE. Under the optimized experimental conditions tryptophan showed linear response over the range of 1.0-400.0 μM. The lower detection limit was found to be 0.2 μM for tryptophan. The practical application of the modified electrode was demonstrated by measuring the concentration of tryptophan in real samples.
Ključne riječi
Tryptophan; Fe3O4@SiO2/GO nanocomposite; graphite screen printed electrodes; voltammetry
Hrčak ID:
211788
URI
Datum izdavanja:
8.12.2018.
Posjeta: 1.770 *