Cross-Linked Gelatine by Modified Dextran as a Potential Bioink Prepared by a Simple and Non-Toxic Process.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Bioprinting Technologies

Background:

• Developing suitable bioinks for extrusion-based 3D bioprinting remains challenging.
• Key requirements include appropriate rheology and cytocompatibility for successful scaffold fabrication.

Purpose of the Study:

• To design and characterize novel, cytocompatible hydrogels for 3D bioprinting.
• To evaluate gelatin-dextran hydrogels for their printability, rheological properties, and cell compatibility.

Main Methods:

• Hydrogels were synthesized from bovine, rabbit, and chicken gelatin cross-linked with dextran polyaldehyde.
• Rheological measurements assessed shear-thinning behavior and gelation kinetics.
• 3D printing evaluated scaffold formation and structural integrity.
• Cell viability and distribution were confirmed using fluorescence confocal microscopy.

Main Results:

• The gelatin-dextran hydrogels demonstrated significant shear-thinning behavior and rapid gelation (< 3 min).
• Satisfactory extrusion and self-supported, multi-layered porous structures were achieved.
• All hydrogels were non-cytotoxic, showing homogeneous cell distribution and intact cell structures post-printing.

Conclusions:

• The developed gelatin-based hydrogels show great potential as bioinks for extrusion-based 3D bioprinting.
• These materials offer a promising platform for creating functional tissue-engineered constructs.
• The simple preparation and excellent biocompatibility make them suitable for various bioprinting applications.