Electrochemical immunosensor based on superwettable microdroplet array for detecting multiple Alzheimer's disease...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Analytical Chemistry

Background:

• Alzheimer's disease (AD) is a progressive neurodegenerative disorder with no cure, making early diagnosis critical.
• Current diagnostic methods for AD face limitations, necessitating the development of more sensitive and accessible tools.
• Identifying key biomarkers in blood, such as amyloid-beta (Aβ) and tau proteins, is crucial for early AD detection.

Purpose of the Study:

• To develop a novel electrochemical sensing platform for the simultaneous detection of multiple Alzheimer's disease biomarkers.
• To enhance the sensitivity and reduce the detection limits for AD biomarker quantification in blood samples.
• To provide a promising tool for the early diagnosis and potential intervention of Alzheimer's disease.

Main Methods:

• Fabrication of a superwettable electrochemical sensing platform using nanoAu-modified vertical graphene (VG@Au) substrate.
• Integration of the superwettable substrate into a working electrode for droplet anchoring and signal generation.
• Utilizing an electrochemical micro-workstation for signal conditioning and analysis of AD biomarkers (Aβ40, Aβ42, T-tau, P-tau181).

Main Results:

• The developed platform demonstrated high sensitivity and excellent biocompatibility.
• Achieved remarkably low detection limits for Aβ40 (0.064 pg/ml), Aβ42 (0.012 pg/ml), T-tau (0.039 pg/ml), and P-tau181 (0.041 pg/ml).
• The superwettable microdroplet array facilitated efficient sample handling and signal amplification.

Conclusions:

• The superwettable electrochemical sensing platform offers a highly sensitive and efficient method for detecting multiple AD biomarkers in blood.
• This technology holds significant promise for the early diagnosis of Alzheimer's disease, enabling timely intervention.
• The platform's characteristics, including large specific surface area and good electrical conductivity, contribute to its superior performance.