Abstract
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 language | English |
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Article number | 131288 |
Journal | Sensors and Actuators, B: Chemical |
Volume | 355 |
DOIs | |
Publication status | Published - 2022 Mar 15 |
Keywords
- 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