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Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
Published on: February 1, 2022
Impedimetric immunoglobulin G immunosensor based on chemically modified graphenes.
Adeline Huiling Loo1, Alessandra Bonanni, Adriano Ambrosi
1Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
Nanoscale
|December 22, 2011
Summary
This study introduces a new graphene-based immunosensor for detecting immunoglobulin G (IgG). Thermally reduced graphene oxide demonstrated superior performance for this sensitive and selective biosensing application.
Area of Science:
- Biomedical Engineering
- Materials Science
- Electrochemistry
Background:
- High sensitivity and selectivity are crucial for biomedical immunosensors.
- Graphene offers significant potential for fabricating advanced immunosensors.
Purpose of the Study:
- To evaluate the immunosensing capabilities of various graphene surfaces.
- To develop a simple, label-free electrochemical impedimetric immunosensor for immunoglobulin G (IgG).
Main Methods:
- Chemically modified graphene (CMG) surfaces including graphite oxide, graphene oxide, thermally reduced graphene oxide, and electrochemically reduced graphene oxide were prepared.
- Disposable electrochemical printed electrodes were modified with CMG and immobilized with anti-immunoglobulin G (anti-IgG).
- Detection was achieved via changes in impedance spectra of a redox probe upon IgG attachment.
Main Results:
- Thermally reduced graphene oxide exhibited the best performance among the tested CMG materials.
- The optimal anti-IgG concentration was determined to be 10 μg/mL.
- The immunosensor demonstrated a linear detection range from 0.3 μg/mL to 7 μg/mL for IgG.
Conclusions:
- The developed immunosensor shows high sensitivity, selectivity, and optimal performance with thermally reduced graphene oxide.
- This graphene-based immunosensor is a promising tool for biomedical applications requiring accurate IgG detection.
