Electrochemical detection of kynurenic acid in the presence of tryptophan with the carbon paste electrode modified with the flower-like nanostructures of zinc oxide doped with terbium

Frontiers in Chemistry

Chemistry

Mehran Moradalizadeh¹  Mohammad Mehdi Foroughi¹  Ali Amir Poursaeed¹  Mehdi Shahidi Zandi¹  Shohreh Jahani² 

[1] Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran;Noncommunicable Diseases Research Center, Bam University of Medical Sciences, Bam, Iran;

关键词: kynurenic acid;    tryptophan;    carbon paste;    zinc oxide;    terbium;   

DOI  :  10.3389/fchem.2023.1250994

 received in 2023-06-30, accepted in 2023-09-01,  发布年份 2023

来源: Frontiers

【 摘 要 】

With the help of a hydrothermal approach in this study, we could provide flower-like nanostructures (NSs) of zinc oxide (ZnO) doped with Tb (FL-NS Tb3+/ZnO). Then, FL-NS Tb3+/ZnO morphology was investigated by energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and map analysis. The results revealed higher activity centers and porosity of this nanocomposite, which were followed by acceptable electrochemical function. Hence, it can be utilized for fabricating an electrochemical sensor with an appropriate response for the simultaneous determination of kynurenic acid (KYN) and tryptophan (TRP). However, as compared with the modified carbon paste electrode (FL-NS Tb3+/ZnO/CPE), the bare carbon paste electrode (BCPE) exhibited a weak response toward KYN and TRP but the modified electrode was followed by a high current response for KYN and TRP at a potential 0.35 and 0.809 V. Therefore, cyclic voltammetry (CV) was applied in optimal experimental conditions to study the electrochemical behaviors of KYN and TRP over the surface of the proposed modified electrode. Moreover, we used differential pulse voltammetry (DPV) for quantitative measurements. It was found that this new modified electrode linearly ranged from 0.001 to 700.0 μM, with detection limits of 0.34 nM and 0.22 nM for KYN and TRP, respectively. In addition, KYN and TRP in real samples can be analyzed by this sensor, with a recovery of 97.75%−103.6% for the spiked KYN and TRP in real samples.

【 授权许可】

Unknown   
Copyright © 2023 Amir Poursaeed, Jahani, Moradalizadeh, Shahidi Zandi and Foroughi.