Disposable polydimethylsiloxane/silicon hybrid chips for protein detection

Shifeng Li, Pierre N. Floriano, Nicolaos Christodoulides, David Y. Fozdar, Dongbing Shao, Mehnaaz F. Ali, Priya Dharshan, Sanghamitra Mohanty, Dean Neikirk, John T. McDevitt, Shaochen Chen

Research output: Contribution to journalArticlepeer-review


This paper presents disposable protein analysis chips with single- or four-chamber - constructed from poly(dimethylsiloxane) (PDMS) and silicon. The chips are composed of a multilayer stack of PDMS layers that sandwich a silicon microchip. This inner silicon chip features an etched array of microcavities hosting polymeric beads. The sample is introduced into the fluid network through the top PDMS layer, where it is directed to the bead chamber. After reaction of the analyte with the probe beads, the signal generated on the beads is captured with a CCD camera, digitally processed, and analyzed. An established bead-based fluorescent assay for C-reactive protein (CRP) was used here to characterize these hybrid chips. The detection limit of the single-chamber protein chip was found to be 1 ng/ml. Additionally, using a back pressure compensation method, the signals from each chamber of the four-chamber chip were found to fall within 10% of each other.

Original languageEnglish (US)
Pages (from-to)574-580
Number of pages7
JournalBiosensors and Bioelectronics
Issue number4
StatePublished - Oct 15 2005


  • C-reactive protein
  • Disposable
  • Poly(dimethylsiloxane)
  • Taste chip

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biomedical Engineering
  • Electrochemistry


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