AuNPs/CNOs/SWCNTs/chitosan-nanocomposite modified electrochemical sensor for the label-free detection of carcinoembryonic antigen

Biosens Bioelectron. 2018 Jun 1;107:211-217. doi: 10.1016/j.bios.2018.02.037. Epub 2018 Feb 14.


In this work, a nanocomposite of gold nanoparticles (AuNPs), carbon nano-onions (CNOs), single-walled carbon nanotubes (SWCNTs) and chitosan (CS) (AuNPs/CNOs/SWCNTs/CS) was prepared for the development of highly sensitive electrochemical immunosensor for the detection of carcinoembryonic antigen (CEA), clinical tumor marker. Firstly, layer-by-layer fabrication of the CEA-immunosensors was studied using cyclic voltammetry (CV) and square wave voltammetry (SWV). By combining the advantages of large surface area and electronic properties of AuNPs, CNOs, SWCNTs, and film forming properties of CS, AuNPs/CNOs/SWCNTs/CS-nanocomposite-modified glassy carbon electrode showed a 200% increase in effective surface area and electronic conductivity. The calibration plot gave a negative linear relationship between log[concentration] of CEA and electrical current with a correlation coefficient of 0.9875. The CEA-immunosensor demonstrated a wide linear detection range of 100 fg mL-1 to 400 ng mL-1 with a low detection limit of 100 fg mL-1. In addition to high sensitivity, reproducibility and large stability, CEA-immunosensor provided an excellent selectivity and resistant-to-interference in the presence of other antigens in serum and hence a potential to be used with real samples.

Keywords: Carbon nano-onions; Carcinoembryonic antigen; Electrochemical; Gold nanoparticles; Label-free; Single-walled carbon nanotubes.

Publication types

  • Evaluation Study

MeSH terms

  • Antibodies, Immobilized / chemistry
  • Biosensing Techniques / instrumentation
  • Biosensing Techniques / methods*
  • Carcinoembryonic Antigen / blood*
  • Chitosan / chemistry*
  • Electrochemical Techniques / instrumentation
  • Electrochemical Techniques / methods
  • Electrodes
  • Equipment Design
  • Gold / chemistry*
  • Humans
  • Limit of Detection
  • Nanocomposites / chemistry*
  • Nanocomposites / ultrastructure
  • Nanotubes, Carbon / chemistry*
  • Nanotubes, Carbon / ultrastructure
  • Reproducibility of Results


  • Antibodies, Immobilized
  • Carcinoembryonic Antigen
  • Nanotubes, Carbon
  • Gold
  • Chitosan