Journal
BIOELECTROCHEMISTRY
Volume 122, Issue -, Pages 93-102Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2018.03.007
Keywords
Reduced graphene oxide; Nanoparticle; Tumor necrosis factor-alpha; Impedance spectroscopy; Biomarker; Human serum
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2015R1C1A1A02037739]
- BioNano Health-Guard Research Center - Ministry of Science, ICT & Future Planning (MSIP) of Korea as Global Frontier Project [H-GUARD-2015M3A6B2063548]
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Highly sensitive and selective biosensors for accurate determination of specific protein biomarkers at low levels in serum are a prerequisite for the present healthcare systems. Therefore, here we developed a label-free impedimetric method for tumor necrosis factor-alpha (TNE-alpha) detection using reduced graphene oxide (RGO) with gold nanoparticles (AuNP) on an indium tin oxide (ITO) microdisk electrodes. The detection mechanism relies on resistance change occurs due to [Fe(CN)(6)](3-/4-) redox probe movement towards the conductive channels of the AuNP-RGO films gated by the recognition of the target biomarker by its anti-TNE-alpha antibody. The conductivity of the AuNP-RGO structures enhanced by 10-fold in comparison with bare electrode chips. The observed resistance changes at 2 Hz (Delta R-at 2Hz) enabled the quantification of various concentrations of TNF-alpha in human serum (CHS-TNF-alpha). The antibody-adsorbed electrode showed a good increment of resistance change (Delta R) with additions of antigen concentration. The sensor possesses a linear range of 1-1000 pg/ml had a detection limit of 0.67 pg/ml (38.51 fM) and 0.78 pg/ml (44.83 fM) in PBS and human serum, respectively. (C) 2018 Elsevier B.V. All rights reserved.
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