Aptamer-based biosensor for sensitive PDGF detection using diamond transistor

A. Rahim Ruslinda*, Shinya Tajima, Yoko Ishii, Yuichiro Ishiyama, Robert Edgington, Hiroshi Kawarada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


The detection of platelet-derived growth factor (PDGF) via a solution-gate field-effect transistor (SGFET) has been demonstrated for the first time using aptamers immobilized on a diamond surface. Upon introduction of PDGF to the immobilized aptamer, a shift of 31.7. mV in the negative direction is observed at a source-drain current of -50 μA. A shift of 32.3. mV in the positive direction is detected after regeneration by SDS solution, indicating that the static measurement returns to its original value. These SGFETs operate stably within the large potential window of diamond (>3.0. V), and hence the surface channel does not need passivating with a thick insulating layer. Thereof, the immobilized aptamer channels have been exposed directly to the electrolyte solution without a gate insulator. Immobilization is achieved via aptamers covalently bonding to amine sites, thereby increasing the sensitivity of the biosensors. Diamond SGFETs have potential for the detection of PDGF and show durability against biological degradation after repeated usage and regeneration.

Original languageEnglish
Pages (from-to)1599-1604
Number of pages6
JournalBiosensors and Bioelectronics
Issue number4
Publication statusPublished - 2010 Dec 15


  • Aptamer
  • Biosensor
  • Diamond transistor
  • Platelet-derived growth factor

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biomedical Engineering
  • Electrochemistry


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