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Related Experiment Videos

Superquenching as a detector for microsphere-based flow cytometric assays.

Reema Zeineldin1, Menake E Piyasena, Troy S Bergstedt

  • 1Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA.

Cytometry. Part a : the Journal of the International Society for Analytical Cytology
|April 11, 2006
PubMed
Summary

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This study demonstrates a new flow cytometry method using fluorescent conjugated polymers and superquenching for enhanced biosensing. Microspheres coated with these polymers show significant fluorescence reduction when quenched, enabling sensitive detection.

Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Biotechnology

Background:

  • Fluorescent conjugated polymers offer high fluorescence quantum yields and superquenching sensitivity.
  • These polymers are utilized in bead-based biosensors for sensitive detection.
  • Superquenching on microspheres is explored for flow cytometric assays.

Purpose of the Study:

  • To investigate a novel detection method utilizing superquenching on microspheres for flow cytometry.
  • To evaluate the superquenching of poly(p-phenylene-ethynylene) (PPE) by 9,10-anthraquinone-2,6-disulfonic acid (AQS).
  • To explore the role of lipid bilayers in mediating superquenching for biosensing.

Main Methods:

  • Microspheres were coated with cationic poly(p-phenylene-ethynylene) (PPE).

Related Experiment Videos

  • Superquenching of PPE by AQS was analyzed using fluorometric methods.
  • The effect of an anionic lipid bilayer as a barrier to superquenching was investigated.

    • Main Results:

    • Flow cytometry successfully detected superquenching of PPE on microspheres (MS-PPE) by AQS, showing significant fluorescence reduction.
    • A Stern-Volmer quenching constant of 0.8x10^6 M^-1 was determined.
    • Anionic lipid bilayers inhibited superquenching, while their disruption restored it.

    Conclusions:

    • Flow cytometry's sensitivity combined with fluorescent polymer superquenching offers advantages over conventional methods.
    • Superquenching of fluorescent polymers provides a new tool for flow cytometry-based biosensing.
    • Lipid bilayer formation and disruption offer novel strategies for mediated superquenching in biosensing applications.