Analytical and Bioanalytical Chemistry

, Volume 398, Issue 6, pp 2693–2700 | Cite as

Microfluidic immunosensor with integrated liquid core waveguides for sensitive Mie scattering detection of avian influenza antigens in a real biological matrix

  • Brian C. Heinze
  • Jessica R. Gamboa
  • Keesung Kim
  • Jae-Young Song
  • Jeong-Yeol Yoon
Original Paper

Abstract

This work presents the use of integrated, liquid core, optical waveguides for measuring immunoagglutination-induced light scattering in a microfluidic device, towards rapid and sensitive detection of avian influenza (AI) viral antigens in a real biological matrix (chicken feces). Mie scattering simulations were performed and tested to optimize the scattering efficiency of the device through proper scatter angle waveguide geometry. The detection limit is demonstrated to be 1 pg mL−1 in both clean buffer and real biological matrix. This low detection limit is made possible through on-chip diffusional mixing of AI target antigens and high acid content microparticle assay reagents, coupled with real-time monitoring of immunoagglutination-induced forward Mie scattering via high refractive index liquid core optical waveguides in close proximity (100 μm) to the sample chamber. The detection time for the assay is <2 min. This device could easily be modified to detect trace levels of any biological molecules that antibodies are available for, moving towards a robust platform for point-of-care disease diagnostics.

Keywords

Lab-on-a-chip Optofluidic Immunoassay Bird flu Latex agglutination Influenza A 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Brian C. Heinze
    • 1
  • Jessica R. Gamboa
    • 1
  • Keesung Kim
    • 2
  • Jae-Young Song
    • 3
  • Jeong-Yeol Yoon
    • 1
  1. 1.Department of Agricultural and Biosystems EngineeringThe University of ArizonaTucsonUSA
  2. 2.School of Mechanical and Aerospace EngineeringSeoul National UniversitySeoulSouth Korea
  3. 3.Virology Division, National Veterinary Research and Quarantine ServiceAnyangSouth Korea

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