Stamp-Imprinted Polymer EIS Biosensor for Amyloid-Beta Detection: A Novel Approach Towards Alzheimer's Screening

Area of Science:

• Biomaterials Science
• Analytical Chemistry
• Biosensor Technology

Background:

• Surface-imprinted polymers (SIPs) are cost-effective alternatives to antibodies for biosensing.
• Conventional SIPs face challenges in scalability and material complexity.
• Stamp imprinting offers a simplified and scalable SIP fabrication method.

Purpose of the Study:

• To develop and evaluate a stamp-imprinted electrochemical impedance spectroscopy (EIS) biosensor.
• To quantify amyloid beta-42 (Aβ-42), a biomarker for Alzheimer's disease.
• To assess the sensor's performance in complex biological matrices.

Main Methods:

• Utilized stamp imprinting with polycaprolactone (PCL) to create Aβ-42 imprinted sites.
• Employed electrochemical impedance spectroscopy (EIS) for label-free quantification.
• Tested sensor performance in blood serum, including presence of serum albumin.

Main Results:

• Achieved a low detection limit of approximately 10 fg/mL for Aβ-42.
• Demonstrated a wide detection range (10 fg/mL to 10 μg/mL) relevant to physiological concentrations.
• Exhibited sensitivity comparable to antibody-based EIS devices, even in complex serum samples.

Conclusions:

• Stamp-imprinted PCL-based EIS biosensors provide a sensitive and selective method for Aβ-42 detection.
• This technology presents a viable, scalable alternative to antibody-based diagnostics.
• The developed biosensor is suitable for portable, point-of-care applications in Alzheimer's disease diagnostics.