Picoliter droplet microfluidic immunosorbent platform for point-of-care diagnostics of tetanus

Alexander Golberg, Martin L. Yarmush, Tania Konry

Research output: Contribution to journalArticlepeer-review


We have developed a sensitive, specific, rapid and low cost picoliter microsphere-based platform for bioanalyte detection and quantification. In this method, a biological sample, biosensing microspheres, and fluorescently labeled detection (secondary) antibodies are co-encapsulated to capture the analyte (here: human anti-tetanus immunoglobulin G) on the surface of the microsphere in microfluidic pL-sized droplets. The absorption of the analyte and detecting antibodies on the microsphere concentrate the fluorescent signal in correlation with analyte concentration. Using our platform and commercially available antibodies, we were able to quantify anti-tetanus antibodies in human serum. In comparison to standard bulk immunosorbent assays, the microfluidic droplet platform presented here reduces the reagent volume by four orders of magnitude, while fast reagent mixing reduces the detection time from hours to minutes. We consider this platform to be a major leap forward in the miniaturization of immunosorbent assays and to provide a rapid and low cost tool for global point-of-care. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)855-860
Number of pages6
JournalMikrochimica Acta
Issue number9-10
StatePublished - Jul 2013
Externally publishedYes


  • Biosensor microsphere
  • Droplet microfluidics
  • Point-of-care diagnostics
  • Tetanus immunization status

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry


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