An Injectable Hydrogel Prepared Using a PEG/Vitamin E Copolymer Facilitating Aqueous-Driven Gelation.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery Systems

Background:

• Injectable hydrogels are crucial for targeted drug and cell delivery in biomedical applications.
• Current hydrogels face challenges in commercialization despite satisfactory properties.
• Developing novel, easily manufacturable hydrogels is essential for advancing therapeutic delivery.

Purpose of the Study:

• To develop a simple, injectable hydrogel based on poly(ethylene glycol) and vitamin E methacrylate.
• To investigate the gelation mechanism and properties of the novel hydrogel system.
• To assess the biocompatibility and potential applications of the developed hydrogel.

Main Methods:

• Synthesized a poly(ethylene glycol)-methacrylate and vitamin E methacrylate copolymer (PEGMA-co-Ve) via free radical polymerization.
• Utilized a solution of low molecular weight poly(ethylene glycol) and vitamin E as a non-aqueous solvent.
• Investigated gelation in aqueous environments, driven by hydrophobic vitamin E self-assembly and phase separation.

Main Results:

• Achieved immediate hydrogel formation in aqueous environments with controllable gelation times.
• Demonstrated tunable hydrogel properties (water content, mechanical strength, drug release) through formulation and polymer molecular weight.
• Confirmed no significant in vitro cytotoxicity and good in vivo tissue compatibility (ocular and subcutaneous).

Conclusions:

• The developed PEGMA-co-Ve hydrogel offers a simple and customizable platform for injectable drug and cell delivery.
• The vitamin E-driven self-assembly provides a unique mechanism for hydrogel formation and tunable properties.
• The hydrogel's biocompatibility and versatile characteristics suggest significant potential for diverse biomedical applications, including localized therapies.