Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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A New Concept for Efficient Sensitivity Amplification of a QCM Based Immunosensor for TNF-α by Using Modified Magnetic Particles under Applied Magnetic Field

  • Bahk, Yeon-Kyoung (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Hyung-Hoon (School of Mechanical Engineering, Pusan National University) ;
  • Park, Deog-Su (Institute of BioPhysio Sensor Technology, Pusan National University) ;
  • Chang, Seung-Cheol (Institute of BioPhysio Sensor Technology, Pusan National University) ;
  • Go, Jeung-Sang (School of Mechanical Engineering, Pusan National University)
  • Received : 2011.07.06
  • Accepted : 2011.10.01
  • Published : 2011.12.20
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Abstract

This study introduces a new concept for a simple, efficient and cheap sensitivity amplification of a Quartz Crystal Microbalance (QCM) based immunosensor system for the detection of tumor necrosis factor-alpha (TNF-${\alpha}$, TNF) by using an in-built magnetic system. The frequency shift due to the applied magnetic field was successfully observed on magnetic particles labeled detection antibodies, anti-human TNF-${\alpha}$, which were bound to the immunologically captured TNF-${\alpha}$ on the gold coated quartz crystals. In the present system, the magnitude of frequency shift depends on both the strength of magnetic field and the amount of target antigen applied. Significant signal amplification was observed when the additional built-in residual stress generated by the modified magnetic particles under the magnetic field applied. Used in conjunction with a sandwich type non-competitive immunoassay format, the lower detection limit was calculated to be 25 $ngmL^{-1}$ and showed good linearity up to TNF-${\alpha}$ concentrations as high as 2.0 ${\mu}gmL^{-1}$. The sensitivity, most importantly, was improved up to 4.3 times compared with the same QCM system which was used only an antigen-antibody binding without additional magnetic amplification.

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