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Investigation of the Binding Force between Protein A and Immunoglobulin G Using Dielectrophoretic(DEP) Tweezers Inside a Microfluidic Chip

미세유체 칩 내에서 유전영동 집게(Dielectrophoretic Tweezers) 를 이용한 단백질A와 면역 글로불린 G의 결합에 관한 연구

  • Kwak, Tae Joon (Department of Biomedical Engineering, Yonsei University) ;
  • Lee, Jae Woo (Department of Biomedical Engineering, Yonsei University) ;
  • Yoon, Dae Sung (Department of Biomedical Engineering, Yonsei University) ;
  • Lee, Sang Woo (Department of Biomedical Engineering, Yonsei University)
  • Received : 2013.04.09
  • Accepted : 2013.06.25
  • Published : 2013.09.30

Abstract

The 'Dielectrophoretic Tweezers(DEP Tweezers)' can be used as a facile, economical toolkit for quantitative measurement of chemical and biological binding forces related to many biological interactions within a microfluidic device. Our experimental setup can probe the interaction between a single receptor molecule and its specific ligand. Immunoglobulin G(IgG) functionalized on polystyrene microspheres has been used to detect individual surface linked Staphylococcus protein A(SpA) molecules and to characterize the strength of the noncovalent IgG-SpA bond. It was measured and compared with the existing measurements. Measured single binding force of between Goat, Rabbit IgG and SpA were $17{\pm}7pN$, $74{\pm}16pN$. This work can be used to investigate several different ligand-receptor interactions and antigen-antibody interactions.

Keywords

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