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Related Experiment Videos

Microcontact printing of proteins inside microstructures.

Jennifer Foley1, Heinz Schmid, Richard Stutz

  • 1IBM Research GmbH, Zurich Research Laboratory, 8803 Rüschlikon, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 16, 2005
PubMed
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This study introduces microcontact printing to integrate binding sites within microfluidic networks (MFNs) for enhanced bioassays. This method enables precise protein patterning in microstructures, advancing bioanalytical applications with small sample volumes.

Area of Science:

  • Biotechnology
  • Materials Science
  • Analytical Chemistry

Background:

  • Microfluidic devices enable miniaturized biological assays with small sample volumes and rapid results.
  • Existing microfluidic networks (MFNs) utilize capillary forces and require analyte binding sites on sealing covers.
  • Previous MFNs were functionalized with gold (Au) and poly(ethyleneglycol) (PEG) monolayers, with binding sites on polydimethylsiloxane (PDMS) covers.

Purpose of the Study:

  • To develop and validate methods for integrating analyte binding sites directly within MFN microstructures using microcontact printing (µCP).
  • To evaluate the impact of different substrate materials and surface treatments on the fluorescence of printed antibodies (Abs).
  • To optimize protein printing conditions and assess the influence of microchannel geometry on pattern accuracy.

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Main Methods:

  • Microcontact printing of fluorescently labeled antibodies (Abs) onto various planar surfaces (glass, Si, Au, Au-HS-PEG) to assess fluorescence quenching.
  • Inking proteins onto PDMS stamps with varying micropatterns and aspect ratios for transfer analysis.
  • Printing Abs into MFN microchannels using optimized stamp pressure and evaluating pattern fidelity based on microchannel aspect ratio.

Main Results:

  • Gold surfaces coated with thiolated poly(ethyleneglycol) (HS-PEG) reduced fluorescence by ~65% but improved wettability for printing.
  • Accurate microcontact printing of Abs into MFNs was achieved when the microchannel aspect ratio was below approximately 1:6.
  • A functional assay demonstrated the successful patterning of antibodies within microchannels.

Conclusions:

  • Microcontact printing offers a versatile method for patterning proteins within microfluidic networks.
  • This technique allows for the direct integration of binding sites into MFNs, simplifying assay design.
  • The developed methods hold promise for creating advanced microfluidic devices for bioanalytical applications.