Issue 28, 2019

Phytic acid-based copper(ii) ion-selective electrode on graphene oxide for potentiometric immunoassay of breast cancer antigen 15-3

Abstract

A potentiometric immunoassay based on a copper(II) ion-selective electrode (Cu-ISE) was designed for the quantitative determination of carbohydrate antigen 15-3 (CA 15-3; a tumor marker associated with breast cancer). To construct such a Cu-ISE-based assay system, a sandwiched immunoreaction was carried out on a capture antibody-coated microplate by using a cupric oxide (CuO) nanoparticle-labeled detection antibody, whereas the Cu-ISE was prepared on a gold-disk electrode by using phytic acid-functionalized graphene oxide nanosheets as the transducer. Followed by forming the immunocomplexes, the dissolved Cu2+ ions from CuO nanoparticles by acids were specifically chelated with immobilized phytic acid on the electrode because of the highly efficient complexing ability, thereby resulting in a change of the electrode potential. Under optimum conditions, the Cu-ISE-based potentiometric immunosensor yielded a near Nernstian slope (12.01 ± 0.66 mV dec−1) for the detection of CA 15-3 within a dynamic linear range of 0.01–100 U mL−1 with a low detection limit of 5.3 mU mL−1. Moreover, the Cu-ISE-based immunoassay showed good reproducibility, high specificity and long-time stability. Furthermore, it was applied for the determination of CA 15-3 in human serum specimens, providing well-matched results in comparison with the referenced CA 15-3 ELISA kit. Importantly, the Cu-ISE-based immunoassay provides a promising alternative for simple and reliable screening of disease-related biomarkers.

Graphical abstract: Phytic acid-based copper(ii) ion-selective electrode on graphene oxide for potentiometric immunoassay of breast cancer antigen 15-3

Article information

Article type
Paper
Submitted
10 Apr 2019
Accepted
17 Jun 2019
First published
18 Jun 2019

New J. Chem., 2019,43, 11171-11177

Phytic acid-based copper(II) ion-selective electrode on graphene oxide for potentiometric immunoassay of breast cancer antigen 15-3

M. Zheng, Y. Cao, W. Cai, X. Shi, M. Wang and Y. Deng, New J. Chem., 2019, 43, 11171 DOI: 10.1039/C9NJ01834D

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