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Towards antimicrobial yet bioactive Cu-alginate hydrogels.
I Madzovska-Malagurski1, M Vukasinovic-Sekulic, D Kostic
1University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia.
Biomedical Materials (Bristol, England)
|June 16, 2016
Summary
Copper-alginate microbeads were developed for biomedical uses. Different copper concentrations allowed tuning properties for antimicrobial wound dressings or tissue engineering scaffolds, showing significant potential.
Area of Science:
- Biomaterials Science
- Materials Chemistry
- Biomedical Engineering
Background:
- Alginate hydrogels are versatile biomaterials, but their properties can be limited.
- Replacing calcium with essential metallic ions offers a simple method to enhance alginate hydrogels.
- Copper (Cu) is a metallic ion with known antimicrobial and biological significance.
Purpose of the Study:
- To synthesize and characterize copper-alginate (Cu-alginate) hydrogel microbeads.
- To investigate the influence of copper(II) ion concentration on microbead properties and performance.
- To evaluate the potential of Cu-alginate microbeads for antimicrobial and tissue engineering applications.
Main Methods:
- Cu-alginate microbeads were produced using electrostatic extrusion.
- Gelling solutions with varying Cu(II) concentrations (13.5–270 mM) were employed.
- In vitro characterization included assessment of Cu(II) content, size, biomechanical properties, and Cu(II) release.
- Antimicrobial activity against Escherichia coli and Staphylococcus aureus was tested.
- Chondrogenic potential was evaluated using bovine calf chondrocytes in 3D culture.
Main Results:
- Microbead properties, including Cu(II) content, size, and mechanical characteristics, were significantly influenced by the gelling solution concentration.
- Higher Cu(II) loading (~100 μmol g⁻¹) resulted in immediate bactericidal effects against Gram-negative and Gram-positive bacteria.
- Lower Cu(II) content (~60 μmol g⁻¹) led to slower Cu(II) release, supporting chondrogenic differentiation of chondrocytes.
- The study demonstrated tunable properties of Cu-alginate microbeads based on copper ion concentration.
Conclusions:
- Cu-alginate microbeads can be effectively produced with tunable properties by controlling Cu(II) concentration during synthesis.
- These tailored microbeads show promise for dual applications: as antimicrobial agents and as scaffolds for tissue regeneration.
- The findings highlight the potential of Cu-alginate hydrogels for developing advanced biomedical devices like wound dressings and cartilage implants.
