Simultaneous determination of dopamine and tyrosine by electrochemical method using glassy carbon electrode modified with the prepared ZIF-8@CO-TA nanocomposite

Subject Areas :

Naz-Maryam Setoodeh ¹ (PhD Student of Analytical Chemistry, Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran.)
Shohreh Jahani ² (Assistant Prof. of Inorganic Chemistry, Bam University of Medical Sciences, Bam, Iran)
Maryam Kazemipour ³ (Professor of Analytical Chemistry, Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran.)
Mohammad Mehdi Foroughi ⁴ (Assistant Prof. of Analytical Chemistry, Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran.)

Received: 2021-10-24 Accepted : 2022-04-19 Published : 2023-05-22

Keywords: nanocomposite, Dopamine, Glassy carbon electrode, Electrochemical sensor, Tyrosine,

Abstract :

Conventional methods for simultaneous measurement of biological, medical and pharmaceutical samples are time consuming, costly and complex, and require sample preparation. Therefore, the methods that despite being cheap and simple, have very high selectivity and sensitivity, are of interest. In this study, a nanocomposite, abbreviated as ZIF-8@CO-TA, was synthesized using the zeolite imidazolate framework, cobalt, and tannic acid. The prepared nanocomposite was characterized by a scanning electron microscope (SEM), a transmission electron microscope (TEM), and Fourier transform infrared (FTIR) spectroscopy. The glassy carbon electrode modified with this nanocomposite was applied for simultaneous measurement of dopamine and tyrosine, in pH=6, by using electrochemical techniques of differential pulse voltammetry, cyclic voltammetry, and chronoamperometry. In the range of 10.0-140.0 μM using differential pulse voltammetry, the detection limits of 3.2 and 6.38 μM were obtained for dopamine and tyrosine, respectively. The glassy carbon electrode modified with this nanocomposite showed good long-term stability. 

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