Hyperbranched polyglycerol hydrogels prepared through biomimetic mineralization

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Hyperbranched polyglycerols (HPGs) are increasingly used in biomedicine due to their biocompatibility, similar to polysaccharides.
• Traditional hydrogel preparation for HPGs involves toxic epoxy reagents, limiting their application.
• A need exists for safer, more efficient hydrogel fabrication methods for HPGs.

Purpose of the Study:

• To develop a one-stage, non-toxic procedure for jellifying aqueous hyperbranched polyglycerol solutions.
• To utilize biomimetic mineralization for hydrogel formation, avoiding hazardous cross-linking agents.
• To characterize the structure and mechanical properties of the resulting silica-encased HPG hydrogels.

Main Methods:

• Employed tetrakis(2-hydroxyethyl)orthosilicate as a silica precursor for biomimetic mineralization.
• Performed jellification in a single stage under neutral pH and ambient conditions.
• Utilized scanning electron microscopy, transmission electron microscopy, dynamic rheology, and dynamic light scattering for characterization.

Main Results:

• Successfully achieved one-stage, non-toxic hydrogel formation from aqueous HPG solutions.
• Demonstrated that HPGs are encased within a silica matrix, forming a 3D mesoporous network.
• Revealed aggregation of HPG macromolecules in initial solutions and within the silica matrix.

Conclusions:

• The developed biomimetic mineralization technique offers a safe and efficient alternative for preparing HPG hydrogels.
• The resulting silica-encased HPG hydrogels possess a unique mesoporous structure suitable for biomedical applications.
• Understanding HPG aggregation is crucial for controlling hydrogel formation and properties.