Microchimica Acta

, 185:253 | Cite as

Aptamer based label free thrombin assay based on the use of silver nanoparticles incorporated into self-polymerized dopamine

Original Paper

Abstract

The authors describe an electrochemical aptasensor for thrombin that is based on the use of a glassy carbon electrode (GCE) modified with polydopamine that is loaded with silver nanoparticles (PDA/AgNPs). The use of AgNPs improves the conductivity of the film and increases the surface area of the GCE. PDA was deposited on the GCE via self-polymerization, and the thrombin binding aptamer was grafted onto the PDA-modified GCE by a single step reaction. Residual electrode surface was blocked with 6-mercapto-1-hexanol. On exposure to thrombin, the electrochemical impedance of the modified electrode increases gradually. Response is linear in the 0.1 pM to 5.0 nM thrombin concentration range, and the limit of detection is as low as 36 fM. The method is selective and capable of detecting thrombin in diluted human serum. In our perception, such a GCE modified with AgNP in a PDA matrix may be applied to many other analytes for which appropriate aptamers are available.

Graphical abstract

Schematic of an electrochemical aptasensor for sensitive and selective thrombin detection based on the use of a self-polymerized polydopamine film loaded with silver nanoparticles.

Keywords

Aptasensor Polydopamine Nanocomposites Chemically modified electrode Self-polymerization Electrochemistry Biosensor Electrochemical impedance spectroscopy 

Notes

Compliance with ethical standards

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

Supplementary material

604_2018_2787_MOESM1_ESM.doc (414 kb)
ESM 1 (DOC 414 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Sensor Analysis of Tumor Marker, Ministry of Education, College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdaoChina
  2. 2.College of Chemistry and Chemical EngineeringTaishan UniversityTaianPeople’s Republic of China

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