Application of Polyaniline to an Enzyme-Amplified Electrochemical Immunosensor as an Electroactive Report Molecule

  • Kwon, Seong-Jung (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Seo, Myung-Eun (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Yang, Hae-Sik (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Kim, Sang-Youl (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Kwak, Ju-Hyoun (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST))
  • Received : 2010.07.06
  • Accepted : 2010.07.16
  • Published : 2010.11.20


Conducting polymers (CPs) are widely used as matrixes for the entrapment of enzymes in analytical chemistry and biosensing devices. However, enzyme-catalyzed polymerization of CPs is rarely used for immunosensing due to the difficulties involved in the quantitative analysis of colloidal CPs in solution phase. In this study, an enzyme-amplified electrocatalytic immunosensor employing a CP as a redox marker has been developed. A polyanionic polymer matrix, $\alpha$-amino-$\omega$-thiol terminated poly(acrylic acid), was employed for precipitation of CP. The acrylic acid group acts as a polyanionic template. The thiol terminus of the polymer was used to produce self-assembled monolayers (SAMs) on Au electrodes and the amine terminus was employed for immobilization of biomolecules. In an enzymeamplified sandwich type immunosensor, the polyaniline (PANI) produced enzymatically is attracted by the electrostatic force of the matrix polymer. The precipitated PANI was characterized by electrochemical methods.


Polyaniline;Conducting polymer;Enzymatic synthesis;Electrochemical detection;Immunosensor


Supported by : National Research Foundation of Korea (NRF), Korea Research Foundation


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