Synchronizing nonfouling and antimicrobial properties in a zwitterionic hydrogel

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Surface Science

Background:

• Developing materials with both antimicrobial and nonfouling properties is challenging.
• Existing strategies often compromise one property when enhancing the other.
• Controlled drug release from hydrogels requires precise management of release kinetics.

Purpose of the Study:

• To create a zwitterionic hydrogel platform integrating simultaneous antimicrobial and nonfouling functionalities.
• To ensure the nonfouling property is maintained throughout the drug release process.
• To demonstrate tunable drug release kinetics from the hydrogel matrix.

Main Methods:

• Conjugation of an antimicrobial agent (salicylate) to a zwitterionic hydrogel via ester linkage.
• Hydrolysis of the ester bond to trigger controlled release of the antimicrobial agent.
• Assessment of nonfouling properties against protein adsorption and bacterial adhesion.
• Characterization of drug loading capacity and release profiles.

Main Results:

• The hydrogel successfully integrated antimicrobial and nonfouling properties without mutual compromise.
• The zwitterionic nature of the hydrogel was preserved before, during, and after drug release.
• High drug loading (one salicylate per monomer) was achieved while maintaining nonfouling efficacy.
• Drug release rate was controlled by the monomer hydrolysis rate, enabling tailored release.

Conclusions:

• The developed zwitterionic hydrogel offers a promising platform for simultaneous antimicrobial and nonfouling applications.
• The tunable drug release mechanism allows for controlled delivery of hydrophilic drugs.
• This approach overcomes limitations of existing materials by maintaining essential properties throughout drug elution.