Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (4): 20230521.doi: 10.7503/cjcu20230521

• Analytical Chemistry • Previous Articles     Next Articles

Graphene⁃gold Nanomaterial Modified Electrode for the Detection of L-Tyrosine

MA Qinzheng1,2, WANG Wei1,2(), LIANG Xuting1,2   

  1. 1.Hebei University of Technology,School of Electronics and Information Engineering,Tianjin 300401,China
    2.Tianjin Key Laboratory of Electronic Materials and Device,Tianjin 300401,China
  • Received:2023-12-25 Online:2024-04-10 Published:2024-01-31
  • Contact: WANG Wei E-mail:wangwei@hebut.edu.cn
  • Supported by:
    the Natural Science Foundation of Hebei Province, China(F2019202377)

Abstract:

Using a green and simple electrochemical method, a reduced graphene oxide-gold nanocomposite thin film was prepared for the detection of L-tyrosine(L-Tyr). The modified electrode was characterized via scanning electron microscopy(SEM), cyclic voltammetry(CV), and electrochemical impedance spectroscopy(EIS). The electrochemical behavior of L-Tyr on the modified electrode in 0.1 mol/L phosphate buffer solution was investigated using differential pulse voltammetry(DPV). The results demonstrated a significantly enhanced voltammetric response of L-Tyr on the modified electrode compared to a bare glassy carbon electrode(GCE). Optimization of the composite film’s thickness, pH of the supporting electrolyte, deposition potential, and accumulation time were carried out. Under the optimal experimental conditions, the oxidation peak current of L-Tyr exhibited a good linear relationship within the concentration ranges of 0.1—50 μmol/L and 50—1000 μmol/L using DPV. Moreover, the sensor demonstrated a detection limit of 50 nmol/L, a sensitivity of 0.553 μA·μmol·L‒1, and displayed excellent repeatability, stability, and anti-interference properties.

Key words: Electrochemistry, Reduced graphene oxide, Gold nanoparticle, Co-deposition, L-Tyr sensor

CLC Number: 

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