Studies on Dopamine Electro-catalysis Oxidation by Anion Surfactant-PEG-Fe3O4 Nanoparticles Modified Magnetic Electrode

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Studies on Dopamine Electro-catalysis Oxidation by Anion Surfactant-PEG-Fe3O4 Nanoparticles Modified Magnetic Electrode

- Studies on Dopamine Electro-catalysis Oxidation by Anion Surfactant-PEG-Fe3O4 Nanoparticles Modified Magnetic Electrode
- Vol. 32, Issue 1, Pages: 94-99(2013)
- 作者机构：
  
  江南大学化学与材料工程学院
- 作者简介：
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Studies on Dopamine Electro-catalysis Oxidation by Anion Surfactant-PEG-Fe3O4 Nanoparticles Modified Magnetic Electrode. [J]. 32(1):94-99(2013)
DOI：

Studies on Dopamine Electro-catalysis Oxidation by Anion Surfactant-PEG-Fe3O4 Nanoparticles Modified Magnetic Electrode. [J]. 32(1):94-99(2013) DOI：

摘要

采用共沉淀法制备了PEG修饰的Fe3O4纳米粒子，用十二烷基苯磺酸钠(SDBS)水溶液将其分散后修饰在装有磁铁的碳糊电极表面，制成SDBS-PEG-Fe3O4磁性电极。循环伏安(CV)测定结果表明，该修饰电极对多巴胺(DA)有良好的电催化作用，DA的氧化峰电流相当于裸电极的5倍，氧化峰和还原峰的电位差从0.221 V减小到0.044 V，可逆性得到了提高。采用方波伏安法测定DA，其氧化峰电流与浓度分别在5.0×10-7~2.0×10-5 mol/L和2.0×10-5~1.0×10-4 mol/L范围内呈线性关系,r2分别为0.996 2和0.976 2；检出限(S/N=3)达1.4×10-7 mol/L。该修饰电极可基本消除抗坏血酸(AA)和尿酸(UA)等共存物质对DA测定的干扰，用于盐酸多巴胺注射液样品的测定，结果令人满意。

Abstract

PEG modified Fe3O4 nanoparticles synthesized by coprecipitation were dispersed in sodium dodecylbenzenesulfonate(SDBS) solution and modified on the surface of magnetic carbon paste electrode(MCPE) to prepare the SDBS-PEG-Fe3O4/MCPE.Cyclic voltammetry(CV) showed that the modified electrode exhibited a strong catalytic effect on the electrochemical oxidation of dopamine(DA).The oxidation peak current on the modified electrode was 5 times higher than that on the bare MCPE.The potential difference between oxidation peak and reduction peak decreased from 0221 V to 0.044 V,which indicated the increase of redox reversibility of DA.Square wave voltammetry(SWV) showed that the oxidation peak current had a linear relationship with concentration of DA in the ranges of 5.0×10-7-2.0×10-5 mol/L and 2.0×10-5-1.0×10-4 mol/L.The detection limit(S/N=3) was 1.4×10-7 mol/L.The interference of ascorbic acid(AA) and uric acid(UA) could be eliminated efficiently.The proposed method was used to detect the dopamine hydrochloride injection with satisfactory results.

关键词

PEG-Fe3O4纳米粒子修饰电极多巴胺

Keywords

PEG-Fe3O4nanoparticlesmodified electrodedopamine

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青岛大学纤维新材料与现代纺织实验室国家重点实验室培育基地

青岛大学化学化工与环境学院

上海师范大学生命与环境科学学院化学系

College of Chemistry and Molecular Sciences，Wuhan University

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