Nanoparticle-based multiplex biosensor utilising dual dielectrophoretic forces for clinical diagnosis of Alzheimer's disease

Hye Jin Kim, Heeju Ahn, Hongrae Kim, Dongsung Park, Jin San Lee, Byung Chul Lee, Jinsik Kim, Dae Sung Yoon, Kyo Seon Hwang

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The significant correlation between amyloid-beta (Aβ) and tau accumulated in the brain and the levels observed in plasma means that the quantification of plasma Aβ and tau is gaining attention as an alternative to conventional Alzheimer's disease (AD) diagnostic methods, such as neuroimaging and psychological memory evaluation. However, there remain limitations, such as low accuracy and reproducibility of AD diagnosis using plasma Aβ and tau quantification in clinical samples. Here, we propose an interdigitated microelectrode (IMEs)-based impedimetric biosensor that uses polystyrene beads (PS) and dielectrophoretic (DEP) force and demonstrate its clinical applicability in AD diagnosis. In the quantification of Aβ and tau present in 1% standard plasma as well as in phosphate-buffered saline (PBS), the biosensor showed almost more than 2-fold higher sensitivity compared to the reference without PS and DEP force. Furthermore, by quantifying the levels of Aβ and tau in the clinical plasma samples, we successfully distinguished between clinically diagnosed AD patients and normal controls with high accuracy (p < 0.0001). These results suggest that our biosensor has high applicability and excellent potential for the clinical diagnosis of AD.

Original languageEnglish
Article number131288
JournalSensors and Actuators B: Chemical
Publication statusPublished - 2022 Mar 15

Bibliographical note

Publisher Copyright:
© 2021 Elsevier B.V.


  • Alzheimer's disease
  • Amyloid-beta
  • Dielectrophoresis
  • Multiplexing
  • Polystyrene bead
  • Tau

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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