Biomedical Microdevices

, 11:1175

Finger-actuated, self-contained immunoassay cassettes

  • Xianbo Qiu
  • Jason A. Thompson
  • Zongyuan Chen
  • Changchun Liu
  • Dafeng Chen
  • Sudhir Ramprasad
  • Michael G. Mauk
  • Serge Ongagna
  • Cheryl Barber
  • William R. Abrams
  • Daniel Malamud
  • Paul L. A. M. Corstjens
  • Haim H. Bau
Article

DOI: 10.1007/s10544-009-9334-4

Cite this article as:
Qiu, X., Thompson, J.A., Chen, Z. et al. Biomed Microdevices (2009) 11: 1175. doi:10.1007/s10544-009-9334-4

Abstract

The building blocks for an inexpensive, disposable, luminescence-based microfluidic immunoassay cassette are described, and their integration in a point-of-care diagnostic system is demonstrated. Fluid motion in the cassette is driven by depressing finger-actuated pouches. All reagents needed for the immunoassay can be stored in the cassette in liquid form. Prior to use, the cassette consists of two separate parts. A top storage component contains pouches, sealed storage chambers, a metering chamber, and needle seats. The bottom processing component contains connection needles, a mixing chamber, and a detection chamber with immobilized proteins. Subsequent to sample introduction, the storage and processing components are mated. The needles form hydraulic connections between the two parts and, in some cases, close valves. The pouches are then actuated sequentially to induce flow of various reagents and facilitate process operations. The cassette is compatible with different detection modalities. Both a cassette with immunochromatographic-based detection and a cassette with microbead-based detection were constructed and evaluated. The immunochromatographic cassette was used to detect antibodies to HIV in saliva samples. The bead-based cassette was used to detect the proinflammatory chemokine IL-8. The experimental data demonstrates good repeatability and reasonable sensitivity.

Keywords

MicrofluidicFinger-actuationPouchNeedleImmunoassayConsecutive flowImmunochromatographyFunctionalized microbead array

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Xianbo Qiu
    • 1
  • Jason A. Thompson
    • 1
  • Zongyuan Chen
    • 1
    • 5
  • Changchun Liu
    • 1
  • Dafeng Chen
    • 1
  • Sudhir Ramprasad
    • 1
    • 6
  • Michael G. Mauk
    • 1
  • Serge Ongagna
    • 2
  • Cheryl Barber
    • 2
  • William R. Abrams
    • 2
  • Daniel Malamud
    • 2
    • 3
  • Paul L. A. M. Corstjens
    • 4
  • Haim H. Bau
    • 1
  1. 1.Department of Mechanical Engineering and Applied MechanicsUniversity of PennsylvaniaPhiladelphiaUSA
  2. 2.Department of Basic SciencesNew York University College of DentistryNew YorkUSA
  3. 3.Department of MedicineNYU School of MedicineNew YorkUSA
  4. 4.Department of Molecular Cell BiologyLeiden University Medical CenterLeidenThe Netherlands
  5. 5.Rheonix, Inc.IthacaUSA
  6. 6.Pacific Northwest National LaboratoryCorvallisUSA