Delayed Sensor Activation Based on Transient Coatings: Biofouling Protection in Complex Biofluids.

Area of Science:

• Materials Science
• Biomedical Engineering
• Sensor Technology

Background:

• Biofouling significantly limits the performance and longevity of electrochemical biosensors in complex biological fluids.
• Existing sensor technologies struggle with continuous monitoring due to biofouling and the need for frequent surface renewal.
• Delayed actuation of sensing surfaces is desirable for overcoming these limitations.

Purpose of the Study:

• To develop transient polymeric coatings for programmable, delayed exposure of multi-electrode sensor arrays.
• To investigate the anti-biofouling properties and tunable sequential actuation capabilities of these coatings.
• To demonstrate the feasibility of direct glucose monitoring in untreated biofluids using the developed delayed sensor system.

Main Methods:

• Fabrication of transient polymeric coatings with tailored density and thickness.
• Characterization of coating dissolution rates and sequential actuation of individual sensing electrodes.
• Application of the delayed sensor system for direct glucose monitoring in untreated blood and saliva samples.

Main Results:

• Transient coatings enabled programmable, time-delayed exposure of fresh sensor surfaces.
• Controlled coating properties allowed tunable sequential actuation of sensing electrodes.
• Direct glucose monitoring in untreated blood and saliva was achieved over prolonged periods with reduced biofouling.

Conclusions:

• Transient polymeric coatings offer a viable strategy for delayed sensor actuation and anti-biofouling.
• The developed delayed-sensor exposure concept shows significant promise for continuous operation in complex biological fluids.
• This technology could enable long-term, in-situ monitoring applications in diagnostics and healthcare.