A polymeric microfluidic device for separation of small molecule

Jun Kameoka*, Hongwei Zhong, Jack Henion, Harold G. Craighead

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


We have used an embossed plastic microfluidic system for the electrophoretic separation of relatively small molecules followed by electrospray ionization of the analytes. The separation of dyes has been also visualized in microfluidic systems. A lithographically produced silicon master was used to emboss channels in ZEONOR 1020R plastic. An oxygen plasma was used to convert the plastic channel surface from hydrophobic to hydrophilic characteristics for the separation of molecules in aqueous solution. The channels were sealed by thermal bonding of a cover piece of the same plastic material. The microfluidic device used for mass spectrometry had a separation channel 60 μm wide, 20 μm deep and 3.5 cm long. The channel exit terminated at the edge to couple to a microsprayer for electrospray ionization. A related microfluidic device for electrophoretic separation and fluorescence detection had a separation channel 50 μm wide, 20 μm deep and 3.5 cm long. This was used to separate two dye molecules, Rhodamine B and Texas Red. The volume of sample plug injected into separation channel through a double T junction electrokinetically for mass spectrometry device was calculated to be 2.0 nl and samples were separated within 10 seconds with an applied electric field of 1200 V/cm. The sample volume injected through cross junction for fluorescence detection device was calculated to be 1.2 nl and two dyes were separated within 8 second with the application of electric field 300 V/cm.

Original languageEnglish
Pages (from-to)227-235
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2001
Externally publishedYes
EventMicrofluidics and BioMEMS - San Francisco, CA, United States
Duration: 2001 Oct 222001 Oct 24


  • Capillary Electrophoresis
  • Hot Embossing
  • Mass Spectrometry
  • Microfluidics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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