Electrochemical sensing of dopamine in the presence of serotonin using modified screen-printed carbon electrode: Original scientific paper

Somayeh Tajik; Fariba Garkani Nejad; Hadi Beitollahi

doi:10.5599/jese.3062

Authors

Somayeh Tajik Research Center for Tropical and Infectious Diseases, Kerman University of Medical Sciences, Kerman, Iran https://orcid.org/0000-0002-1151-5515
Fariba Garkani Nejad Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran https://orcid.org/0000-0002-3919-950X
Hadi Beitollahi Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran https://orcid.org/0000-0002-0669-5216

DOI:

https://doi.org/10.5599/jese.3062

Keywords:

Neurotransmitters, electrochemical sensor, metal-organic framework, graphene oxide

Abstract

The Zr-based metal-organic framework (NH₂-UiO-66(Zr))/graphene oxide (GO) nanocomposite was synthesized via a simple approach and used as a voltammetric sensing platform. By integrating NH₂-UiO-66 (Zr) with GO, the resulting nanocomposite exhibits superior sensor performance due to synergistic effects. The sensor was fabricated using a straightforward drop-casting method, where a suspension of NH₂-UiO-66 (Zr)/GO was applied to a screen-printed carbon electrode (NH₂-UiO-66 (Zr)/GO/SPCE). The NH₂-UiO-66 (Zr)/GO/SPCE sensor was then employed to determine dopamine (DA) using differential pulse voltammetry (DPV). The NH₂-UiO-66 (Zr)/GO/SPCE sensor demonstrated a linear response to DA over a concentration range of 0.001 to 800.0 µM, with a high sensitivity of 0.1002 µA µM^-1. Using the DPV method, a limit of detection (LOD) of 0.5 nM was achieved. It was further employed as a sensing platform for the simultaneous detection of DA and serotonin (STN). The DA and STN peak separation were 245 mV. The NH₂-UiO-66 (Zr)/GO/SPCE sensor was successfully used to analyse DA and STN in a human urine sample, achieving satisfactory recovery rates of 97.8 to 104.2 %.

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Electrochemical sensing of dopamine in the presence of serotonin using modified screen-printed carbon electrode

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