Dual-Cross-Linked PEI/PVA Hydrogel for pH-Responsive Drug Delivery

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery Systems

Background:

• Controlled drug release systems are crucial for targeted therapies.
• pH-responsive materials offer potential for site-specific drug delivery, particularly in acidic tumor microenvironments.
• Dual cross-linked hydrogels can provide tunable mechanical and release properties.

Purpose of the Study:

• To develop and characterize a novel pH-responsive dual cross-linked hydrogel for controlled drug release.
• To investigate the influence of pH on the hydrogel's physicochemical and mechanical properties.
• To evaluate the drug release profile of the hydrogel in acidic conditions.

Main Methods:

• Synthesis of a dual cross-linked hydrogel using reversible borate ester bonds and crystalline poly(vinyl alcohol).
• Evaluation of rheological, mechanical, and microstructural properties at varying pH.
• Assessment of drug release kinetics from the hydrogel in physiological and acidic environments.
• Biocompatibility testing of the hydrogel.

Main Results:

• The hydrogel exhibited pH-dependent swelling and reduced mechanical strength in acidic conditions due to borate ester bond hydrolysis and amine group protonation.
• Drug-encapsulated hydrogels demonstrated sustained and enhanced drug release in acidic environments.
• Drug release followed the Fickian diffusion mechanism.
• The hydrogel demonstrated good biocompatibility.

Conclusions:

• Borate ester bond-based hydrogels are effective pH-responsive materials for controlled drug delivery.
• The developed hydrogel shows significant potential for targeted drug delivery in acidic tumor environments.
• This biomaterial platform holds promise for advancing biomedical research and therapeutic applications.