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Micropunching Lithography for Generating Micro- and Submicron-patterns on Polymer Substrates
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Published on: July 2, 2012

Interdigitated multicolored bioink micropatterns by multiplexed polymer pen lithography.

Falko Brinkmann1, Michael Hirtz, Alexandra M Greiner

  • 1Institute of Nanotechnology (INT) and Karlsruhe, Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Germany; Physical Institute and Center for Nanotechnology (CeNTech), University of Münster, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|April 5, 2013
PubMed
Summary

This study introduces polymer pen lithography (PPL) for multiplexing, enabling the creation of complex protein patterns on microscale surfaces for biological experiments. This technique allows for precise, bio-friendly fabrication of bioactive microarrays with retained functionality.

Keywords:
bioinksmicroarraysmicropatterningmultiplexingpolymer pen lithography

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Area of Science:

  • Biotechnology and Bioengineering
  • Materials Science
  • Cell Biology

Background:

  • Multiplexing, the integration of multiple inks in microscale patterns, is challenging for techniques like microcontact printing (μCP).
  • There is a significant need for interdigitated protein patterns at subcellular to cellular length scales for biological research.

Purpose of the Study:

  • To present a novel integrative approach for fabricating bioactive microarrays and complex multi-ink patterns using polymer pen lithography (PPL).
  • To enable true multiplexing within repetitive subpatterns through an innovative inking and writing strategy for PPL.

Main Methods:

  • Developed a new inking and writing strategy for PPL, combining strengths of μCP with PPL's spatial control and repetition.
  • Utilized a biotin-streptavidin approach for immobilizing functional proteins and bioactive compounds on a specific ink/substrate platform.
  • Employed biofriendly, nontoxic chemicals and mild processing conditions for pattern fabrication.

Main Results:

  • Successfully fabricated cm² area-filling multiprotein patterns with true multiplexing capabilities.
  • Demonstrated retained bioactivity of fabricated patterns through cell interaction studies.
  • Showcased specific interactions of fibroblasts with fibronectin/laminin patterns and neurons with laminin/ephrin patterns.

Conclusions:

  • The presented PPL-based patterning strategy effectively addresses the challenge of multiplexing for creating complex bioactive microarrays.
  • The method is suitable for cell biologists and biochemists, offering ease of pattern generation, adjustment, and use of biofriendly materials.
  • The fabricated multiprotein patterns maintain bioactivity, enabling relevant cellular responses and applications in biological experiments.