Journal
RSC ADVANCES
Volume 12, Issue 24, Pages 15575-15583Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra00791f
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Funding
- King Saud University, Riyadh, Saudi Arabia [RSP-2021/231]
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The PEDOT-GO-PPO sensor was fabricated for dopamine detection, with the morphology and oxidation-reduction characteristics studied for optimization. Analysis of the detection limit and linear range data showcased the performance advantages of the modified electrode.
In this paper, we fabricated poly(3,4-ethylenedioxythiophene) (PEDOT)-graphene oxide-polyphenol oxidase (PEDOT-GO-PPO) as a dopamine sensor. The morphology of PEDOT-GO-PPO was observed using scanning electron microscopy. Cyclic voltammetry was conducted to study the oxidation-reduction characteristics of dopamine. To optimize the pH, potential and limit of detection of dopamine, the amperometric technique was employed. The found limit of detection was 8 x 10(-9) M, and the linear range was from 5 x 10(-8) to 8.5 x 10(-5) M. The Michaelis-Menten constant (K-m) was calculated to be 70.34 mu M, and the activation energy of the prepared electrode was 32.75 kJ mol(-1). The electrode shows no significant change in the interference study. The modified electrode retains up to 80% of its original activity after 2 months. In the future, the biosensor can be used for the quantification of dopamine in human urine samples. The present modified electrode constitutes a tool for the electrochemical analysis of dopamine.
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