Related Experiment Video
Updated: May 10, 2026
12:22
Synthesis of Thermogelling Poly(N-isopropylacrylamide)-graft-chondroitin Sulfate Composites with Alginate Microparticles for Tissue Engineering
Published on: October 26, 2016
Bioerodible calcium sulfate/poly(β-amino ester) hydrogel composites
Bryan R Orellana1, Mark V Thomas, Thomas D Dziubla
1Center for Biomedical Engineering, Wenner-Gren Research Lab, University of Kentucky, Lexington, KY 40506-0070, USA.
Summary
New bone graft substitutes combine calcium sulfate with biodegradable hydrogel particles to promote bone regeneration. These composites offer tunable properties for enhanced prosthetic applications and drug delivery.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Dental Materials
Background:
- Bone resorption necessitates effective bone graft substitutes for prosthetic restoration.
- Calcium sulfate hemihydrate (CS) is a known osteoconductive and biocompatible material.
- Biodegradable hydrogel particles can serve as space-making barriers to prevent soft tissue infiltration during bone regeneration.
Purpose of the Study:
- To develop and characterize novel calcium sulfate hemihydrate (CS)-based composites incorporating poly(β-amino ester) (PBAE) biodegradable hydrogel particles.
- To evaluate the impact of varying PBAE particle amounts and sizes on the composite's physical, mechanical, and degradation properties.
- To assess the potential of these composites for controlled drug release, specifically curcumin.
Main Methods:
- Fabrication of CS-PBAE composite samples with different wt% (1% or 10%) and sizes (53-150 μm or 150-250 μm) of PBAE particles.
- Swelling and degradation studies of PBAE gels and CS composites.
- Microcomputed tomography (MicroCT) for particle distribution analysis.
- Surface erosion rate determination.
- Compression testing for mechanical strength evaluation.
- In vitro drug release studies using curcumin-loaded PBAE particles.
Main Results:
- PBAE hydrogel particles degraded rapidly (<24h), suitable for controlled drug release.
- MicroCT confirmed homogeneous distribution of PBAE particles within the CS matrix.
- CS composites degraded via surface erosion, with 10 wt% PBAE slightly increasing dissolution rate (4% vs. 5% per day).
- Higher PBAE content (10 wt%) significantly reduced composite strength by up to 75%, while particle size had no significant effect.
- Sustained release of curcumin was demonstrated from CS composites containing PBAE particles.
Conclusions:
- CS-PBAE composites show promise as multi-functional bone grafting substitutes.
- Tunable mechanical strength and degradation rates can be achieved by adjusting PBAE content and size.
- These composites facilitate 'space-making' for vertical bone regeneration and enable controlled drug delivery for enhanced therapeutic outcomes.
