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Microchimica Acta

, 186:473 | Cite as

A sandwich-type electrochemical aptasensor for the carcinoembryonic antigen via biocatalytic precipitation amplification and by using gold nanoparticle composites

  • Lingling Xu
  • Zi Liu
  • Sheng Lei
  • Di Huang
  • Lina ZouEmail author
  • Baoxian YeEmail author
Original Paper
  • 125 Downloads

Abstract

A sandwich-type electrochemical aptasensor is described for detecting the carcinoembryonic antigen (CEA) with high sensitivity and accuracy. Two kinds of nanomaterials are used. The first was obtained by modifying gold nanoparticles with reduced graphene oxide and hemin (Hemin-rGO-AuNPs). The second consists of horseradish peroxidase-modified organic-inorganic hybrid nanoflowers linked to gold nanoparticles to obtain an architecture of type HRP-Cu3(PO4)2-HNF-AuNPs). These serve as carriers for two aptamers (apt1 and apt2) against CEA. Simultaneously, they were used to catalyze the precipitation reaction between 4-chloro-1-naphthol(4-CN) and H2O2. A sandwich-type assay linked to enzyme inhibition amplification was established for electrochemical determination of CEA. Under optimal experimental conditions and by using differential pulse voltammetry, the response peak currents (best measured at −0.34 V vs. Ag/AgCl) increases linearly with the logarithm of the CEA concentration in the range between 100 fg mL−1 and 100 ng mL−1. The detection limit is as low as 29 fg mL−1.

Graphical abstract

Schematic representation of the sandwich-type electrochemical aptasensor based on signal inhibition amplification from biocatalytic precipitation reaction. (HRP-Cu3(PO4)2 hybrid nanoflowers: Horseradish Peroxidase-Cu3(PO4)2 hybrid nanoflowers; AuNPs: Gold Nanoparticles; Hemin-rGO-AuNPs: Hemin-Reduced Graphene Oxide-Gold Nanoparticles; BSA: Bovine Serum Albumin; CEA: Carcinoembryonic Antigen; CEAapt1: 5′-SH-(CH2)6-ATA CCA GCT TAT TCA ATT-3′; CEAapt2: 5′-NH2-(CH2)6-AGG GGG TGA AGG GAT ACC C-3′; GCE: Glassy carbon electrode; 4-CN: 4-Chloro-1-naphthol; DPV: Differential pulse voltammetry).

Keywords

Organic-inorganic hybrid nanoflowers Horseradish peroxidase Aptamer Peroxidase-like mimic Hybrid materials Hemin 4-Chloro-1-naphthol Signal inhibition amplification Differential pulse voltammetry Tumor biomarker 

Notes

Acknowledgments

The authors are sincerely grateful for the financial support from the National Natural Science Foundation of China (Grant no. 21575130; U1504216) and Startup Research Fund of Zhengzhou University (Grant no. 1511316006).

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2019_3542_MOESM1_ESM.docx (821 kb)
ESM 1 (DOCX 820 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Chemistry and Molecular EngineeringZhengzhou UniversityZhengzhouPeople’s Republic of China

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