Pressure stabilizer for reproducible picoinjection in droplet microfluidic systems

Minsoung Rhee, Yooli K. Light, Suzan Yilmaz, Paul D. Adams, Deepak Saxena, Robert J. Meagher, Anup K. Singh

Research output: Contribution to journalArticlepeer-review


Picoinjection is a promising technique to add reagents into pre-formed emulsion droplets on chip however, it is sensitive to pressure fluctuation, making stable operation of the picoinjector challenging. We present a chip architecture using a simple pressure stabilizer for consistent and highly reproducible picoinjection in multi-step biochemical assays with droplets. Incorporation of the stabilizer immediately upstream of a picoinjector or a combination of injectors greatly reduces pressure fluctuations enabling reproducible and effective picoinjection in systems where the pressure varies actively during operation. We demonstrate the effectiveness of the pressure stabilizer for an integrated platform for on-demand encapsulation of bacterial cells followed by picoinjection of reagents for lysing the encapsulated cells. The pressure stabilizer was also used for picoinjection of multiple displacement amplification (MDA) reagents to achieve genomic DNA amplification of lysed bacterial cells.

Original languageEnglish (US)
Pages (from-to)4533-4539
Number of pages7
JournalLab on a Chip
Issue number23
StatePublished - Dec 7 2014

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • General Chemistry
  • Biomedical Engineering


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