高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (8): 1656.doi: 10.7503/cjcu20180034

• 分析化学 • 上一篇    下一篇

碳纤维微电极表面负载含氧官能团及PDDA-纳米金粒子用于神经递质多巴胺的检测

李元1, 王婷婷1, 李梅1, 程寒1,2()   

  1. 1.中南民族大学药学院, 2.民族药学国家级实验教学示范中心, 武汉 430074
  • 收稿日期:2018-01-09 出版日期:2018-08-10 发布日期:2018-06-27
  • 作者简介:联系人简介: 程 寒, 女, 博士, 副教授, 主要从事药物分析方面的研究. E-mail: chenghan@mail.scuec.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 21205144)、 中南民族大学学术团队资助项目(批准号: XTZ15013)、 中央高校基本科研业务费专项资金(批准号: CZY18036, CZZ16004)、 中南民族大学大学生创新训练计划(批准号: 201710524029)和中南民族大学研究生创新基金计划(批准号: 2018SYCXJJ214)资助.

Determination of Dopamine Based on RO/Gold Nanoparticles-poly(dienedimethylammonium chloride) Modified Carbon Fiber Microelectrode

LI Yuan1, WANG Tingting1, LI Mei1, CHENG Han1,2,*()   

  1. 1.School of Pharmaceutical Sciences, 2. National Demonstration Center for Experimental Ethnopharmacology Education, South-Central University for Nationalities, Wuhan 430074, China
  • Received:2018-01-09 Online:2018-08-10 Published:2018-06-27
  • Contact: CHENG Han E-mail:chenghan@mail.scuec.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21205144), the Academic Team Funding Program of South-Central University for Nationalities, China(No.XTZ15013), the Fundamental Research Funds for the Central Universities of China(Nos.CZY18036, CZZ16004), the Student Innovation and Venture Training Program of South-Central University for Nationalities, China(No.201710524029) and the Graduate Student Innovation Fund Program of South-Central University for Nationalities, China(No.2018SYCXJJ214).

摘要:

将碳纤维微电极(CFME)置于超纯水中进行恒电位电沉积, 在其表面修饰含氧基团(RO); 再采用恒电位法在电极表面负载以聚二烯二甲基氯化铵(PDDA)为保护剂制备的纳米金粒子(AuNPs), 制得RO/AuNPs-PDDA/CFME修饰电极. 利用扫描电子显微镜对修饰前后碳纤维电极的表面形貌进行了表征, 探讨了修饰电极在多巴胺(DA)溶液中的电化学行为. 结果表明, 在20 mmol/L pH=7.0的Tris-HCl缓冲溶液中, 复合修饰膜RO/AuNPs-PDDA对DA具有显著的电催化活性. 在最优实验条件下, 采用差示脉冲伏安技术(DPV)对DA进行定量分析, DA的氧化峰电流与其浓度在1×10-7~5×10-5 mol/L范围内呈良好的线性关系, 相关系数R2=0.9912, 检出限达3.3×10-8 mol/L(S/N=3). 该修饰方法重现性好, 电极稳定性佳, 制备方便, 可广泛应用于生物样品中DA的高灵敏分析.

关键词: 聚二烯二甲基氯化铵(PDDA), 功能化纳米金, 碳纤维微电极, 多巴胺

Abstract:

Carbon fiber microelectrode(CFME) was modified with oxygen-containing groups(RO) in pure water by potentiostatic method, then with poly(dially dimethyl ammonium chloride)(PDDA) functionalized gold nanoparticles(AuNPs) by electrochemical deposition method, as a result, the RO/AuNPs-PDDA/CFME was fabricated. The surface morphologies of different modified microelectrodes were characterized by means of scanning electron microscope(SEM), and the cyclic voltammetry behaviors of DA were investigated with modified electrodes. The research results showed that in pH 7.0, 20 mmol/L Tris-HCl buffer solution, the RO/AuNPs-PDDA/CFME exhibited excellent electrocatalytic effect toward dopamine(DA). Under the optimal experimental conditions, the oxidation peak current was proportional to the concentration of DA in the range of 1×10-7—5×10-5 mol/L with a correlation coefficient of 0.9912. The detection limit was 3.3×10-8 mol/L(S/N=3). In brief, the RO/AuNPs-PDDA/CFME has the advantages of simple preparation, good reproducibility and high stability, thus, it is suitable for sensitive detection of DA.

Key words: Poly(dially dimethyl ammonium chloride)(PDDA), Functionalized AuNP, Carbon fiber microelectrode, Dopamine

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