Biotechnology and Bioprocess Engineering:BBE

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Nano-scale Probe Fabrication Using Self-assembly Technique and Application to Detection of Escherichia coli O157:H7

  • Oh, Byung-Keun (Department of Chemical and Biomolecular Engineering, Sogang University) ;
  • Lee, Woochang (Department of Chemical and Biomolecular Engineering, Sogang University) ;
  • Lee, Won-Hong (Department of Chemical and Biomolecular Engineering, Sogang University) ;
  • Park, Jeong-Woo (Department of Chemical and Biomolecular Engineering, Sogang University)
  • Published : 2003.07.01
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Abstract

A self-assembled monolayer of protein G was fabricated to develop an immunosensor based on surface plasmon resonance (SPR), thereby improving the performance of the antibodybased biosensor through immobilizing the antibody molecules (lgG). As such, 11-mercaptoundecanoic acid (11-MUA) was adsorbed on a gold (Au) support, while the non-reactive hydrophilic surface was changed through substituting the carboxylic acid group (-COOH) in the 11-MUA molecule using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrocholide (EDAC). The formation of the self-assembled protein G layer on the Au substrate and binding of the antibody and antigen were investigated using SPR spectroscopy, while the surface topographies of the fabricated thin films were analyzed using atomic force microscopy (AFM). A fabricated monoclonal antibody (Mab) layer was applied for detecting E. coli O157:H7. As a result, a linear relationship was achieved between the pathogen concentration and the SPR angle shift, plus the detection limit was enhanced up to 10$^2$ CFU/mL.

Keywords

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