Fabrication of immobilized enzyme reactors with pillar arrays into polydimethylsiloxane microchip

Cynthia Nagy, Adam Kecskemeti, Attila Gaspar

Research output: Contribution to journalArticle


This paper demonstrates the design, efficiency and applicability of a simple and inexpensive microfluidic immobilized enzymatic reactor (IMER) for rapid protein digestion. The high surface-to-volume ratio (S/V) of the reactor was achieved by forming pillars in the channel. It was found that pillar arrays including dimensions of 40 μm × 40 μm as pillar diameter and interpillar distance can provide both relatively high S/V and flow rate in the PDMS chip, the fabrication of which was performed by means of soft lithography using average research laboratory infrastructure. CZE peptide maps of IMER-based digestions were compared to peptide maps obtained from standard in-solution digestion of proteins. The peak patterns of the electropherograms and the identified proteins were similar, however, digestion with the IMER requires less than 10 min, while in-solution digestion takes 16 h.

Original languageEnglish
Pages (from-to)70-78
Number of pages9
JournalAnalytica Chimica Acta
Publication statusPublished - Apr 29 2020



  • Array of pillars
  • Digestion
  • Enzyme reactor
  • Immobilization
  • Peptide mapping
  • poly(dimethylsiloxane)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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