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Au/NiFe2O4 Nanoparticle-Decorated Graphene Oxide Nanosheets for Electrochemical Immunosensing of Amyloid Beta Peptide

Abstract

In the present work, an electrochemical immunosensor has been fabricated for the detection of amyloid beta peptide (βA1-42) based on gold nanoparticle/nickel ferrite decorated graphene oxide-chitosan nanocomposite (Au/NiFe2O4@GO-Ch) modified glassy carbon electrode (GCE) as an effective sensing platform. βA1-42 has been analyzed as a potential biomarker for its application in Alzheimer’s disease monitoring. The combination of highly conducting Au and NiFe2O4 nanoparticles on two-dimensional GO nanosheets provide an excellent platform for sensitive and selective sensing applications. A miniaturized Au/NiFe2O4@GO-Ch/GCE immunosensor was prepared by immobilization of βA antibody onto Au//NiFe2O4@GO-Ch/GCE via carbodiimide coupling. Various characterization techniques were utilized in the study to estimate the morphological and electronic attributes of the components used to fabricate the immunosensor. Differential pulse voltammetry (DPV) was performed to study the amperometric response of developed immunosensor as a function of βA1-42 concentration. The DPV results confirmed that the proposed immunosensor detected βA1-42 selectively and demonstrated a wide linear range from 1 pg mL-1 to 1 ng mL-1 and a detection limit of 3.0 pg mL-1. Furthermore, the immunosensor also indicated its clinical viability by detecting βA1-42 in cerebrospinal fluids.

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Publication details

The article was received on 12 Sep 2019, accepted on 04 Nov 2019 and first published on 05 Nov 2019


Article type: Paper
DOI: 10.1039/C9NA00578A
Nanoscale Adv., 2019, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    Au/NiFe2O4 Nanoparticle-Decorated Graphene Oxide Nanosheets for Electrochemical Immunosensing of Amyloid Beta Peptide

    R. Devi, S. Gogoi, H. S. Dutta, M. Bordoloi, S. K. Sanghi and R. Khan, Nanoscale Adv., 2019, Accepted Manuscript , DOI: 10.1039/C9NA00578A

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