Issue 22, 2015

Electrochemical immunosensor for sensitive determination of the anorexigen peptide YY at grafted reduced graphene oxide electrode platforms

Abstract

The first electrochemical immunosensor for the determination of peptide YY is reported in this paper. A novel electrochemical platform, prepared by the electrochemical grafting of the diazonium salt of 4-aminobenzoic acid onto a reduced graphene oxide-modified glassy carbon electrode, was used, on which the covalent immobilization of specific anti-PYY antibodies was accomplished. The HOOC-Phe-rGO/GCEs were characterized using cyclic voltammetry and electrochemical impedance spectroscopy. The different variables affecting the preparation of the modified electrodes and the performance of the immunosensor were optimized. Under the optimized conditions, a calibration plot for PYY showing a linear range extending between 10−4 and 102 ng mL−1 was found. This range is adequate for the determination of this protein in real samples, since the expected concentration in human serum is around 100 pg mL−1. The limit of detection was 0.01 pg mL−1 of PYY. The immunosensor exhibited good reproducibility of the PYY measurements, excellent storage stability and selectivity, as well as a shorter assay time than those of ELISA kits. The usefulness of the immunosensor for the analysis of real samples was demonstrated by analyzing human serum samples spiked with PYY at three concentration levels.

Graphical abstract: Electrochemical immunosensor for sensitive determination of the anorexigen peptide YY at grafted reduced graphene oxide electrode platforms

Supplementary files

Article information

Article type
Paper
Submitted
13 Jun 2015
Accepted
30 Jul 2015
First published
31 Jul 2015

Analyst, 2015,140, 7527-7533

Author version available

Electrochemical immunosensor for sensitive determination of the anorexigen peptide YY at grafted reduced graphene oxide electrode platforms

S. Guerrero, G. Martínez-García, V. Serafín, L. Agüí, P. Yáñez-Sedeño and J. M. Pingarrón, Analyst, 2015, 140, 7527 DOI: 10.1039/C5AN01185J

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