A spatially addressable bead-based biosensor for simple and rapid DNA detection

Johnson K. Ng, Ezrein S. Selamat, Wen Tso Liu

Research output: Contribution to journalArticlepeer-review


A simple glass-polymer-based biosensor that allows arrays of beads to be immobilized, separated and identified without any prior encoding is developed. To do so, distinct bead types that are conjugated with different oligonucleotide probes are sequentially spotted onto a polymeric matrix (or gel pad) on the surface of the device. The spotted beads are firmly immobilized to the gel pad, acquiring spatial codes that allow them to be identified. Throughput is enhanced by spotting different bead types onto hundreds of different gel pads. The bead-based biosensor was applied for the DNA-based detection of 10 model bacterial species and two single-nucleotide polymorphisms, and based on passive hybridization the final signals are obtained with single-mismatch specificity within 10 min.

Original languageEnglish (US)
Pages (from-to)803-810
Number of pages8
JournalBiosensors and Bioelectronics
Issue number6
StatePublished - Jan 18 2008
Externally publishedYes


  • Bacterial species
  • Beads
  • Biosensor
  • Hybridization
  • Microarray
  • Single nucleotide polymorphism
  • Spatially addressable

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biomedical Engineering
  • Electrochemistry


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