Signal amplification in electrochemical detection of buckwheat allergenic protein using field effect transistor biosensor by introduction of anionic surfactant

Sho Hideshima, Keisuke Fujita, Yoshitaka Harada, Mika Tsuna, Yasuhiro Seto, Satoshi Sekiguchi, Shigeki Kuroiwa, Takuya Nakanishi, Tetsuya Osaka

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12 Citations (Scopus)


Food allergens, especially buckwheat proteins, sometimes induce anaphylactic shock in patients after ingestion. Development of a simple and rapid screening method based on a field effect transistor (FET) biosensor for food allergens in food facilities or products is in demand. In this study, we achieved the FET detection of a buckwheat allergenic protein (BWp16), which is not charged enough to be electrically detected by FET biosensors, by introducing additional negative charges from anionic surfactants to the target proteins. A change in the FET characteristics reflecting surface potential caused by the adsorption of target charged proteins was observed when the target sample was coupled with the anionic surfactant (sodium dodecyl sulfate; SDS), while no significant response was detected without any surfactant treatment. It was suggested that the surfactant conjugated with the protein could be useful for the charge amplification of the target proteins. The surface plasmon resonance analysis revealed that the SDS-coupled proteins were successfully captured by the receptors immobilized on the sensing surface. Additionally, we obtained the FET responses at various concentrations of BWp16 ranging from 1 ng/mL to 10 μg/mL. These results suggest that a signal amplification method for FET biosensing is useful for allergen detection in the food industry.

Original languageEnglish
Pages (from-to)90-94
Number of pages5
JournalSensing and Bio-Sensing Research
Publication statusPublished - 2016 Mar 1



  • Field effect transistor biosensor
  • Food allergen
  • Intrinsic charge
  • Ionic surfactant
  • Signal amplification

ASJC Scopus subject areas

  • Biotechnology
  • Signal Processing
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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