Visual analysis of Alzheimer disease biomarker via low-potential driven bipolar electrode.

Developing a simple, economical, and accurate diagnostic method has positive practical significance for the early prevention and intervention of Alzheimer's disease (AD). Herein, combining a closed bipolar electrode (BPE) chip with multicolor electrochemiluminescence (ECL) imaging technology, we constructed a low-voltage driven portable visualized ECL device for the early screening of AD. By introducing parallel resistance, the total resistance of the circuit was greatly reduced. A classical mixture of Ir(ppy) 3 and Ru(bpy) 3 2+ was used as multicolor emitters of the anode with TPrA as the co-reactant. Capture of amyloid-β (Aβ) through antigen-antibody recognition, and signal amplification by electroactive covalent organic frameworks (COF) probe at the cathode of BPE caused the significantly increased faradaic current. The electrical balance of the BPE system resulted in the change of the emission color from green to red at the anode. The ECL-BPE sensor shows good reproducibility and high sensitivity with detection limit of 1 pM by naked eye. The driving voltage is 3.0 V, which means the chip could be driven by two fifth batteries. The visualized ECL-BPE sensor provides a promising point-of-care testing (POCT) tool for the screening of Alzheimer's-related diseases in the early stage. Schematic illustration of the ECL-BPE for analysis of Aβ under low driving voltage. [Display omitted] • A low-voltage driven portable multicolor ECL-BPE device was designed for the early screening of AD. • This strategy only requires a parallel resistance with the cathode of the BPE chip, reducing the driving voltage. • The concentration of AD biomarkers can be evaluated by a visually discernible green to yellow to red color change. • The proposed multicolor ECL-BPE chip provides a broad prospect for the development of the next generation of POCT devices. [ABSTRACT FROM AUTHOR]