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Highly sensitive electrochemical immunosensor for IgG detection based on optimized rigid biocomposites.

R Montes¹, F Céspedes¹, M Baeza¹

¹Grup de Sensors i Biosensors, Departament de Química, Facultat de Ciències, Edifici C-Nord, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès (Bellaterra), Spain.

Biosensors & Bioelectronics

|December 16, 2015

Summary

Researchers developed novel immunosensors using graphite-epoxy composites for improved detection of Rabbit Immunoglobulin G (RIgG). Optimal material composition and assay conditions were identified, enhancing sensitivity and signal-to-noise ratio for accurate analysis.

Keywords:

Composite optimization Detection limit Electrochemical characterization IgG Immunosensors

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Area of Science:

Electrochemistry
Biosensors
Materials Science

Background:

Development of sensitive and reliable immunosensors is crucial for various analytical applications.
Graphite-epoxy composites offer promising electrochemical properties for transducer development.
Optimization of material composition and assay parameters is essential for enhancing immunosensor performance.

Purpose of the Study:

To construct and optimize novel immunosensors based on graphite-epoxy composites incorporating Rabbit Immunoglobulin G (RIgG).
To improve the electrochemical properties and analytical performance of immunocomposite electrodes.
To determine the optimal graphite loading and antigen-antibody ratio for enhanced sensitivity and signal-to-noise ratio.

Main Methods:

Fabrication of graphite-epoxy composite electrodes with incorporated RIgG.
Electrochemical characterization using electrochemical impedance spectroscopy and cyclic voltammetry.
Optimization of graphite loading (16-17%) and antigen-antibody ratio for a competitive assay using alkaline phosphatase-labeled antibody and hydrogen peroxide substrate.

Main Results:

Optimal graphite loading for sensitive electrode performance was determined to be between 16% and 17%.
The developed immunosensors demonstrated suitable sensitivity, high electron-transfer rate, and high signal-to-noise ratio.
Significant reduction in the optimal antigen-antibody ratio was achieved through assay optimization.

Conclusions:

Graphite-epoxy composites provide a viable matrix for constructing high-performance immunosensors.
The optimized immunosensor composition and assay conditions significantly enhance detection capabilities for RIgG.
This work presents a novel approach to immunosensor development with improved analytical efficiency and reduced reagent consumption.