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Development of specific immobilization method on gold surface and its application for determining cardiac risk

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Abstract

C-reactive protein (CRP) has been regarded as a most valuable marker of inflammation that had been shown in prediction of multiple prospective blood vascular studies such as an incident myocardial infarcion, stroke, peripheral arterial disease, and sudden cardiac death. A CRP detection system on a solid surface was developed using dual-antibody binding, which first antibody was immobilized by specific binding with Protein A via a fusion form with streptavidin. Second antibody bound with CRP was used for an electrochemical analysis on the gold chip surface. The fusion protein and antibodies could be successfully immobiized on the gold surface by strong biotin-streptavidin nteraction as examined by surface plasmon resonance analysis. The result showed that the limit of detection has reached at 2 pg/mL. Precision is adequate, and the wide-range response was shown with the concentraion of CRP between 0.01 pg/mL to 1 mg/mL. Signal difference for the same sample among different estabished chips is very low. Besides, the stable electrical signal was apparently maintained (~88% of initial response) for 35 days after storage at 4°C. This study provided a possibility for the development of portable chips or CRP detection, especially in the point-of-care use.

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Authors and Affiliations

  1. Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 156-756, Korea

    Gi Wook Kim, Myung Sun Kim, Seon Ah Cheon & Tae Jung Park

  2. Department of Chemical Engineering, University of Virginia, Charlottesville, VA, 22904-4741, USA

    Shun Zheng

  3. Department of Applied Bioscience, CHA University, Seongnam, Gyeonggi-do, 463-836, Korea

    Sungho Ko

Authors
  1. Gi Wook Kim
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  2. Shun Zheng
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  3. Myung Sun Kim
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  4. Seon Ah Cheon
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  5. Sungho Ko
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  6. Tae Jung Park
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Correspondence to Tae Jung Park.

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Kim, G.W., Zheng, S., Kim, M.S. et al. Development of specific immobilization method on gold surface and its application for determining cardiac risk. BioChip J 8, 295–302 (2014). https://doi.org/10.1007/s13206-014-8408-4

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  • DOI: https://doi.org/10.1007/s13206-014-8408-4

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