化学
丙烯酸
分子印迹聚合物
检出限
纳米复合材料
聚合
抗坏血酸
核化学
钒酸铋
电化学气体传感器
色谱法
化学工程
电化学
聚合物
单体
光催化
有机化学
选择性
食品科学
催化作用
电极
物理化学
工程类
作者
Felipe Augusto Gorla,Caroline Santana dos Santos,Roberto de Matos,Roberta Antigo Medeiros,Milena do Prado Ferreira,Luan Pereira Camargo,Luiz Henrique Dall’Antônia,César Ricardo Teixeira Tarley
出处
期刊:Talanta
[Elsevier]
日期:2024-01-01
卷期号:266: 125044-125044
被引量:3
标识
DOI:10.1016/j.talanta.2023.125044
摘要
This study proposes the development of a new photoelectrochemical (PEC) sensor for the determination of dopamine (DA) at nanomolar levels. The PEC sensor was based on a physical mixture of bismuth vanadate (BiVO4) with nanocomposite molecularly imprinted poly(acrylic acid) (MIP-AA) grafted onto MWCNTox by using the surface-controlled radical polymerization strategy with an INIFERTER reagent. XRD, diffuse reflectance spectroscopy (DRE), SEM, TEM, and TGA were employed to characterize the materials. Photoelectrochemical analyses were carried out with GCE/BiVO4/MIP-AA sensor under visible light using a potential of 0.6 V, phosphate buffer (0.1 mol L−1) at pH 7.0, and modifying the GCE with a film composed of monoclinic BiVO4 at 3.5 mg mL−1 and nanocomposite MIP prepared with acrylic acid (MIP-AA) at 0.1 mg mL−1. The proposed method using the GCE/BiVO4/MIP-AA sensor presented a limit of detection (LOD) of 2.9 nmol L−1, a linear range from 9.7 to 150 nmol L−1 and it was successfully applied for analysis of DA in urine samples using external calibration curve yielding recovery values of 90–105%. Additionally, the proposed PEC sensor allowed DA determination without interference from uric acid, ascorbic acid, epinephrine, norepinephrine, and other unwanted interferences.
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