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Generalizing Gelatin Methacryloyl Granular Hydrogel Fabrication Using Stable Microgels with Predictable Stiffness.

Yuanhui Xiang1, Zaman Ataie1, Angie Castro1

  • 1Department of Chemical Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.

Advanced Healthcare Materials
|June 3, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a two-step photocrosslinking method for fabricating stable Gelatin methacryloyl granular hydrogel scaffolds (GelMA GHS). This approach enables in situ formation of GelMA GHS under physiological conditions for regenerative engineering.

Keywords:
biomaterialgranular hydrogelin situmicrogelregenerative engineeringscaffold

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Gelatin Methacryloyl Granular Hydrogel Scaffolds: High-throughput Microgel Fabrication, Lyophilization, Chemical Assembly, and 3D Bioprinting
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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Gelatin methacryloyl granular hydrogel scaffolds (GelMA GHS) offer advantages over bulk hydrogels due to tunable, cell-scale void spaces.
  • Conventional GelMA GHS fabrication involves physical crosslinking followed by chemical crosslinking, which is hindered by microgel dissolution at physiological temperatures.
  • The influence of sequential crosslinking on microgel properties and scaffold formation is not fully understood, particularly concerning the balance between microgel stability and covalent assembly.

Purpose of the Study:

  • To develop a generalized method for fabricating GelMA GHS using stable microgels via a two-step photocrosslinking approach.
  • To establish a phase diagram correlating microgel stability (step 1 photocrosslinking) with scaffold formation (step 2 photocrosslinking).
  • To create a regression model predicting mechanical properties based on fabrication variables for GelMA GHS.

Main Methods:

  • A two-step photocrosslinking strategy was employed for GelMA microgel and scaffold fabrication.
  • A phase diagram was constructed to map microgel stability against scaffold formation capability.
  • Box-Behnken design was utilized to develop a regression model for predicting mechanical properties.

Main Results:

  • A novel two-step photocrosslinking method was established for creating stable GelMA GHS.
  • A phase diagram was developed, elucidating the relationship between microgel stability and scaffold assembly.
  • A predictive regression model for mechanical properties was successfully generated.

Conclusions:

  • The developed two-step photocrosslinking approach enables the fabrication of stable GelMA GHS from microgels.
  • This method overcomes the limitations of conventional fabrication, allowing for in situ formation of GelMA GHS at physiological temperatures.
  • The findings facilitate the development of GelMA GHS for diverse translational biomedical applications.