On-Demand, Reversible, Ultrasensitive Polymer Membrane Based on Molecular Imprinting Polymer

Area of Science:

• Biomedical Engineering
• Materials Science
• Analytical Chemistry

Background:

• Continuous health monitoring requires robust, real-time biosensing devices.
• Molecularly imprinted polymers (MIPs) are promising sensor materials but typically suffer from irreversible binding.
• Existing stimuli-responsive MIPs (SR-MIPs) require external chemicals or stimuli for analyte release.

Purpose of the Study:

• To develop fully reversible MIP sensors for longitudinal, real-time health monitoring.
• To overcome the limitations of single-use MIPs by enabling repeated measurements without external stimuli.
• To demonstrate a novel electrostatic repulsion mechanism for analyte release in MIP sensors.

Main Methods:

• Fabrication of thin-film MIPs on electrodes.
• Utilized an electrostatic repulsion mechanism triggered by electrical potential for analyte release.
• Developed and tested an electrostatically refreshed dopamine sensor.

Main Results:

• Demonstrated a dopamine sensor with a 760 pM limit of detection and a linear response.
• Achieved accurate measurements and analyte release over 30 sensing-release cycles.
• Successfully detected low concentrations (<1 nM) of dopamine released from PC-12 cells in vitro.

Conclusions:

• Electrostatic repulsion provides a simple and effective method for creating fully reversible MIP sensors.
• These novel MIP biosensors are suitable for continuous, real-time monitoring of charged molecules in complex biological environments.
• The technology has significant potential for precision health monitoring and other advanced sensing applications.