Phosphonic acid-functionalized poly(amido amine) macromers for biomedical applications.

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Materials Engineering

Background:

• Developing advanced biomaterials with tunable properties is crucial for tissue engineering and regenerative medicine.
• Poly(amido amine) (PAA) macromers offer a versatile platform for creating functional hydrogels.
• Incorporating phosphonic acid groups can enhance biomaterial interactions and mineralization.

Purpose of the Study:

• To synthesize novel phosphonic acid-functionalized PAA macromers.
• To create and characterize PAA-based hydrogels with controlled hydrophilicity and degradation.
• To evaluate the mineralization potential and cytocompatibility of these novel hydrogels.

Main Methods:

• Aza-Michael addition was used to synthesize PAA macromers with varying phosphonic acid content.
• Homo- and copolymerization with 2-hydroxyethyl methacrylate produced hydrogels.
• Swelling, biodegradation, mineralization (FTIR, SEM/EDX), and cell viability assays were performed.

Main Results:

• PAA macromer structure and pre-treatment conditions (pH, CaCl2) allowed tuning of hydrogel swelling and degradation rates.
• Hydrogels demonstrated composition-dependent mineralization in simulated body fluids.
• Degradation products showed no adverse effects on tested cell lines (U-2 OS, Saos-2, NIH 3T3).

Conclusions:

• Novel phosphonic acid-functionalized PAA macromers enable the creation of tunable, biodegradable hydrogels.
• These hydrogels exhibit promising mineralization capabilities and excellent cytocompatibility.
• The developed materials hold potential for use as safe and effective nontoxic degradable biomaterials.