Highly sensitive electrochemical sensor for dopamine with a double-stranded deoxyribonucleic acid/gold nanoparticle/graphene modified electrode

Analytical Methods

Jing Li¹  Wencheng Wang¹  Huanhuan Zhu²  Wei Sun¹  Lijun Yan¹  Yong Cheng²  Guangjiu Li² 

[1] College of Chemistry and Chemical Engineering, Hainan Normal University,Haikou 571158,ChinaCollege of Chemistry and Chemical Engineering, Hainan Normal University,Haikou 571158,ChinaCollege of Chemistry and Chemical Engineering, Hainan Normal University,Haikou 571158,China;College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology,Qingdao 266042,ChinaCollege of Chemistry and Molecular Engineering, Qingdao University of Science and Technology,Qingdao 266042,ChinaCollege of Chemistry and Molecular Engineering, Qingdao University of Science and Technology,Qingdao 266042,China

DOI  :  10.1039/C4AY03008G

学科分类：分析化学

来源: Royal Society of Chemistry

【 摘 要 】

In this paper a novel electrochemical sensor was fabricated for the sensitive detection of dopamine (DA). By using a carbon ionic liquid electrode (CILE) as the substrate electrode, graphene (GR), gold nanoparticles (AuNPs) and double-stranded deoxyribonucleic acid (dsDNA) were electrodeposited on the surface of CILE step-by-step to obtain the modified electrode (dsDNA/Au/GR/CILE). Due to the presence of various modifiers on the electrode surface, the modified electrode exhibited specific synergistic effects, such as high conductivity and large surface of GR, good conductivity and biocompatibility of AuNPs, and the specific binding effect of dsDNA with the target analyte DA. Cyclic voltammetric studies indicated that a pair of well-defined redox peaks of DA appeared on dsDNA/Au/GR/CILE in pH 6.0 phosphate buffer solution and electrochemical behaviors of DA were carefully investigated. Under the optimal conditions the oxidation peak current of DA was linearly related to DA concentration in the range from 0.04 μmol L−1 to 0.6 mmol L−1 with a detection limit of 19.0 nmol L−1 (3σ). The modified electrode displayed excellent selectivity and repeatability, and was further used to detect DA content in drug samples with satisfactory results.

【 授权许可】

Unknown