Simultaneous determination of dopamine and tryptophan using modified glassy carbon electrode with dandelion like Co3O4 nanoflowers

Subject Areas :

Najmeh Sheybani ¹ , Shohreh Jahani ² , Mohammad Mehdi Foroughi ³

1 - PhD student in Analytical Chemistry, Islamic Azad University, Kerman Branch, Iran.
2 - Assistant Professor in Inorganic Chemistry, Bam University of Medical Sciences, Bam, Iran
3 - Assistant Professor of Analytical Chemistry, Islamic Azad University, Kerman Branch, Iran.

Received: 2021-03-18 Accepted : 2021-05-15 Published : 2022-05-22

Keywords: Dopamine, Voltammetry, tryptophan, Dandelion like Co3O4 nanoflower,

Abstract :

In this work glassy carbon electrode modified with dandelion like Co3O4 nanoflower is proposed as an electrochemical sensor to achieve a high-sensitivity electrochemical sensor. The morphology and purity of synthesized nanoflowers are characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectrometer (EDX). Then electro-oxidation of the dopamine and tryptophan at the modified electrode surface was studied using cyclic voltammetry, chronoamperometry and differential pulse voltammetry. Under optimized conditions, the differential pulse voltammetric pulse current increased with increasing dopamine concentration in the range of 0.1 to 0.900 μM and the detection limit of dopamine was calculated as 0.01 μM. The modified electrode showed a very good resolution between voltammetric peak of dopamine and tryptophan, making it suitable for detecting dopamine in the presence of tryptophan in real samples. High sensitivity and good repeatability of the electrode along with low detection limit can be mentioned as outstanding features of this electrode. This sensor was successfully used to accurately determine of dopamine and tryptophan in ampoules and urine samples.

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