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

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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.

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.

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Author notes

  1. Qingjun Xu and Guixiang Wang contributed equally to this work.

Authors and Affiliations

  1. Key Laboratory of Sensor Analysis of Tumor Marker, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    Qingjun Xu, Guixiang Wang, Mingming Zhang, Guiyun Xu, Jiehua Lin & Xiliang Luo

  2. College of Chemistry and Chemical Engineering, Taishan University, Taian, 271021, People’s Republic of China

    Guixiang Wang

Authors
  1. Qingjun Xu
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  2. Guixiang Wang
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  3. Mingming Zhang
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  4. Guiyun Xu
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  5. Jiehua Lin
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  6. Xiliang Luo
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Correspondence to Jiehua Lin or Xiliang Luo.

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Xu, Q., Wang, G., Zhang, M. et al. Aptamer based label free thrombin assay based on the use of silver nanoparticles incorporated into self-polymerized dopamine. Microchim Acta 185, 253 (2018). https://doi.org/10.1007/s00604-018-2787-5

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  • DOI: https://doi.org/10.1007/s00604-018-2787-5

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