Combinatorial Polyacrylamide Hydrogels for Preventing Biofouling on Implantable Biosensors

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Medical Device Engineering

Background:

• Biofouling on medical devices and biosensors compromises function and longevity.
• Poly(ethylene glycol) and zwitterionic polymers are established as standard anti-biofouling coatings.

Purpose of the Study:

• To discover novel anti-biofouling materials beyond current standards.
• To develop and validate new copolymer hydrogels for medical device applications.

Main Methods:

• A combinatorial library of polyacrylamide-based copolymer hydrogels was synthesized.
• High-throughput screening assessed anti-biofouling performance against serum and plasma.
• Machine learning identified key molecular features for enhanced performance.
• In vitro and in vivo evaluations on electrochemical biosensors were conducted.

Main Results:

• Certain nonintuitive copolymer compositions demonstrated superior anti-biofouling capabilities compared to gold standards.
• Machine learning successfully predicted effective copolymer structures.
• Coated biosensors maintained function and enabled continuous in vivo drug measurements in rodent models.

Conclusions:

• Novel polyacrylamide-based copolymer hydrogels represent a significant advancement in anti-biofouling technology.
• This methodology enables the discovery of materials that enhance the performance and longevity of real-time in vivo sensing devices.
• The findings pave the way for next-generation medical devices with improved biocompatibility and extended operational lifetimes.