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Protein microarray spots are modulated by patterning method, surface chemistry and processing conditions.

Kathryn F A Clancy1, Sebastien Dery2, Veronique Laforte3

  • 1Department of Bioengineering, McGill University, Montreal, Canada; Department of Biomedical Engineering, McGill University, Montreal, Canada.

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|September 27, 2018
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Summary
This summary is machine-generated.

Protein microarray pattern quality, crucial for accurate data, depends on printing method and surface chemistry. Optimal uniformity and signal contrast were achieved with specific surface modifications and printing techniques like inkjet and pin printing.

Keywords:
Inkjet printingMicro-contact printingMicroarray spotPin printingProtein microarray

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Area of Science:

  • Biotechnology
  • Surface Chemistry
  • Analytical Chemistry

Background:

  • Protein microarray data accuracy is influenced by pattern uniformity, shape, and signal contrast.
  • Previous studies often optimized single factors, neglecting complex interactions between proteins, fluids, surfaces, and printing methods.

Purpose of the Study:

  • To systematically investigate the impact of surface chemistry and printing methods on protein microarray pattern quality.
  • To compare inkjet, pin, and microcontact printing (µCP) for patterning fluorescently-tagged proteins (IgG, BSA) on various surfaces.

Main Methods:

  • Assessed pattern quality using spot size regularity, morphology, signal intensity, and signal distribution.
  • Compared three printing techniques (inkjet, pin, µCP) on surfaces with varying hydrophobicity and chemistry (e.g., GPS, APTES modified glass slides).

Main Results:

  • Droplet-based printing (inkjet, pin) uniformity was surface-chemistry dependent, with GPS and APTES yielding the best results.
  • µCP pattern uniformity was largely independent of surface chemistry.
  • Inkjet and pin printing on APTES slides provided the highest signal and contrast; µCP signal increased with surface hydrophilicity.

Conclusions:

  • Surface chemistry significantly impacts droplet-based protein microarray printing quality.
  • Microcontact printing offers a more robust patterning method less sensitive to surface variations.
  • Optimizing printing method and surface modification is essential for reliable protein microarray data.