Alginate-chitosan/hydroxyapatite polyelectrolyte complex porous scaffolds: preparation and characterization

Area of Science:

• Biomaterials Science
• Materials Engineering
• Tissue Engineering

Background:

• Porous scaffolds are crucial for tissue regeneration and drug delivery.
• Alginate and chitosan are biocompatible polymers with potential for scaffold fabrication.
• Developing advanced scaffolds with improved mechanical properties is an ongoing challenge.

Purpose of the Study:

• To fabricate novel porous scaffolds using alginate (AG) and chitosan (CS) via polyelectrolyte complex (PEC) formation and freeze-drying.
• To investigate the structural, mechanical, and thermal properties of the fabricated AG-CS PEC scaffolds.
• To compare the properties of AG-CS PEC scaffolds with Ca2+ crosslinked AG scaffolds and uncrosslinked AG scaffolds.

Main Methods:

• Fabrication of porous AG scaffolds using freeze-drying.
• Formation of AG-CS PEC scaffolds by introducing CS or CS/HA solutions into AG scaffold pores.
• Characterization using FT-IR, XRD, and XPS to confirm composite formation.
• Evaluation of microstructure, porosity, mechanical strength, and thermal stability.

Main Results:

• FT-IR, XRD, and XPS confirmed successful coating of CS or CS/HA on the AG scaffold.
• AG-CS PEC scaffolds and Ca2+ crosslinked AG scaffolds exhibited reduced average pore diameter and lower porosity compared to uncrosslinked AG scaffolds.
• AG-CS PEC scaffolds demonstrated superior mechanical strength and thermal stability over Ca2+ crosslinked AG scaffolds.

Conclusions:

• The combination of polyelectrolyte complex formation and freeze-drying is an effective method for fabricating AG-CS composite scaffolds.
• The developed AG-CS PEC scaffolds possess enhanced mechanical and thermal properties, making them promising for biomedical applications.
• These findings contribute to the development of advanced biomaterials for tissue engineering and regenerative medicine.