Table 3.

Biomaterial Optimization for the Scaffold Materials with 0.50% Hyaluronic Acid, Different Gelation Concentrations, and 0.50% Polyethylene Glycol Di-Acrylate or Polyethylene Glycol Tetra-Acrylate Cross-Linker

Gelatin concentration (%)	Cross-linker	Mechanical stability	Biochemical stability (CCM with 10% FBS)	Biochemical stability (CCM with 5% FBS)	Cell adhesion
0.25	PEGDA	×	×	×	✓
0.25	PEGTA	✓	×	×	✓
0.10	PEGTA	✓	×	✓	✓
0.05	PEGTA	✓	✓	✓	×
0.02	PEGTA	✓	✓	✓	×
0.00	PEGTA	✓	✓	✓	×

The symbols ✓ and × show that the scaffold has passed or failed the associated test, respectively.

PEGDA, polyethylene glycol di-acrylate.