Publication Type:

Journal Article

Source:

IET Nanobiotechnology, Institution of Engineering and Technology (2018)

URL:

https://digital-library.theiet.org/content/journals/10.1049/iet-nbt.2018.5150

Keywords:

1-ethyl-3-(3-dimethylaminopropyl)carbodiimide], 11-mercaptoundecanoic acid, 11-MUDA, Au-CO, blood sample, carboxyl group bonding, chemical linkers, chloroauric acid, covalent antibody immobilisation, enzyme-free nanolabel, gold disc electrode, Gold Nanoparticles, HIgG concentrations, human immunoglobulin G, immunosensor, N-hydroxysuccinimide, one pot chemical reduction, pseudo-peroxidase behaviour, quantitative HIgG detection, reduced graphene oxide nanolabel, rGOAu nanolabel, sandwich immunoassay, self-assembled monolayers, signal amplification, sodium borohydride, voltammetric immunosensing

Abstract:

This study describes the development and testing of a simple and novel enzyme-free nanolabel for the detection and signal amplification in a sandwich immunoassay. Gold nanoparticles decorated reduced graphene oxide (rGOAu) was used as the nanolabel for the quantitative detection of human immunoglobulin G (HIgG). The rGOAu nanolabel was synthesised by one pot chemical reduction of graphene oxide and chloroauric acid using sodium borohydride. The pseudo-peroxidase behaviour of rGOAu makes the nanolabel unique from other existing labels. The immunosensing platform was fabricated using self-assembled monolayers of 11-mercaptoundecanoic acid (11-MUDA) on a gold disc electrode. The covalent immobilisation of antibody was achieved through the bonding of the carboxyl group of 11-MUDA and the amino group of the antibody using chemical linkers [1-ethyl-3-(3-dimethylaminopropyl)carbodiimide] and N-hydroxysuccinimide. The fabricated immunosensor exhibited a linear range that included HIgG concentrations of 62.5–500 ng ml−1. The sensor was also used for the testing of HIgG in the blood sample.

Cite this Research Publication

Dr. Satheesh Babu T. G., Vargis V, Priya C. J., Surendran H, Suneesh P. V., and Dr. Bipin G. Nair, “Gold nanoparticles decorated reduced graphene oxide nanolabel for voltammetric immunosensing”, IET Nanobiotechnology, 2018.