Development of the multi-functionalized gold nanoparticles with electrochemical-based immunoassay for protein A detection

Chi Chang Lin, Li Chia Chen, Chien Hao Huang, Shinn Jyh Ding, Chia Chin Chang, Hsien Chang Chang

研究成果: Article同行評審

32 引文 斯高帕斯(Scopus)

摘要

This paper reports an amplification procedure application of multi-functionalized gold nanoparticles (MFAuNPs) which was used for electrochemical impedance immunosensor. The modified electrode which was utilized for the affinity adsorption of protein A, was fabricated by stepwise immobilization of 1, 6-hexanedithiol, AuNPs, and IgG on the gold electrode via self-assembling technique. The interfacial properties of the modified electrodes were evaluated in the presence of Fe(CN)64 - / 3 - couple redox as a probe by cyclic voltammetry and electrochemical impedance spectroscopy. An equivalent circuit model with a constant phase element was used to interpret the obtained impedance spectra. The electrochemical behavior of the redox probe was affected by the accumulation of treated substances on the electrode surface. There is no significant increase in the electron transfer resistance after the binding of protein A to IgG on the electrode surface without amplification. The changes in the electron transfer resistance on the IgG-modified electrodes became more sensitive after the MFAuNPs were introduced for signal amplification. The increments of amplified impedance showed good correlation of the detection of protein A in the range of 5-1000 pg/mL with a detection limit of 1 pg/mL. The development of a rapid, facile, and sensitive amplification method capable to detect biomolecules in the picogram range, utilizing EIS measurement, may be achieved in this study.

原文English
頁(從 - 到)39-45
頁數7
期刊Journal of Electroanalytical Chemistry
619-620
發行號1-2
DOIs
出版狀態Published - 2008 七月 15

All Science Journal Classification (ASJC) codes

  • 分析化學
  • 化學工程 (全部)
  • 電化學

指紋

深入研究「Development of the multi-functionalized gold nanoparticles with electrochemical-based immunoassay for protein A detection」主題。共同形成了獨特的指紋。

引用此