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Microfluidic chip for fast bioassays-evaluation of binding parameters.

Jakub Stepánek¹, Michal Pribyl, Dalimil Snita

¹Department of Chemical Engineering, Institute of Chemical Technology, Prague, Technická 5, 166 28 Praha 6, Czech Republic.

Biomicrofluidics

|August 21, 2009

Summary

This study presents an inexpensive, seven-channel polystyrene microchip for rapid bioaffinity assays. The microchip enables quick evaluation of binding constants and ligand quantification, offering a cost-effective alternative for immunoassays.

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Area of Science:

Biomolecular Engineering
Analytical Chemistry
Microfluidics

Background:

Traditional immunoassays like ELISA are time-consuming, often requiring hours for incubation steps.
The cost of microfluidic chips can be a barrier to their widespread adoption in bioanalytical applications.
Developing rapid, cost-effective, and sensitive bioanalytical tools is crucial for various diagnostic and research purposes.

Purpose of the Study:

To develop and validate a low-cost, multi-channel polystyrene microchip for rapid bioaffinity assays.
To demonstrate the microchip's capability for fast determination of kinetic and equilibrium binding constants.
To enable rapid quantification of ligands using a microfluidic platform.

Main Methods:

Fabrication of a seven-channel polystyrene microchip using micromilling and high-temperature assembly.

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Immobilization of Protein A (PA) onto microchannel walls via passive sorption.

Execution of two bioaffinity assays using human immunoglobulin G (hIgG) as the ligand, with direct or indirect fluorescent detection.

Development of a mathematical model to analyze complex formation and derive binding constants.

Main Results:

Successful construction and operation of a seven-channel polystyrene microchip.
Achieved rapid bioaffinity assays with a 5-minute incubation step, significantly faster than traditional methods.
Obtained calibration curves for hIgG quantification and determined kinetic (k(on)) and equilibrium dissociation (K(d)) constants.
Demonstrated the microchip's potential for cost-effective bioanalytical applications.

Conclusions:

The developed microchip offers a fast and inexpensive platform for evaluating bioaffinity interactions and quantifying ligands.
Passive sorption and polystyrene as a substrate contribute to the low-cost fabrication and operation.
This technology has the potential to overcome cost limitations associated with microfluidic immunoassays.