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Multiscale Structure-Property Relationships in Gelatin-Based Granular Hydrogel Scaffolds
Arian Jaberi1, Yuanhui Xiang1, Amir Sheikhi1,2,3,4,5
1Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
ACS Macro Letters
|October 6, 2025
Summary
Gelatin-based granular hydrogel scaffolds (GHS) offer tunable properties through hierarchical design, from molecular chemistry to microgel assembly. This enables precise control over scaffold architecture for advanced biomedical applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Polymer Chemistry
Background:
- Granular hydrogel scaffolds (GHS) are macroporous biomaterials constructed from interlinked hydrogel particles (microgels).
- Gelatin and its derivatives are common macromolecules in GHS due to their established biological and physicochemical properties.
- GHS possess a hierarchical architecture, from nanoscale polymer networks within microgels to macroscale interstitial pores.
Purpose of the Study:
- To highlight how gelatin chemistry, microgel design, and scaffold assembly regulate the behavior of gelatin-based GHS.
- To map structure-property relationships across molecular, micro, and macro scales.
- To identify opportunities for rational design of GHS for biomedical applications.
Main Methods:
- Analysis of molecular-scale gelatin chemistry influencing crosslinking, degradation, and bioactivity.
- Evaluation of microscale particle design factors (size, stability, shape, stiffness) impacting GHS properties.
- Assessment of macroscale scaffold assembly and its influence on pore architecture and cell infiltration.
Main Results:
- Molecular composition of gelatin dictates microgel stability and mechanical properties.
- Microgel characteristics (size, stiffness, porosity) control GHS pore architecture and mechanical integrity.
- Hierarchical design allows modular control over GHS structural and functional properties.
Conclusions:
- Gelatin-based GHS offer tunable properties via hierarchical design, spanning molecular to macro scales.
- Optimized GHS design facilitates cell infiltration and tissue integration for applications like vascularization and regeneration.
- Understanding structure-property relationships enables rational design of GHS for diverse biomedical uses.
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