Smart pH-Responsive Antimicrobial Hydrogel Scaffolds Prepared by Additive Manufacturing.
Carolina Garcia1, Alberto Gallardo1, Daniel López2
1Polymer Functionalization Group (FUPOL), Instituto de Ciencia y Tecnología de Polímeros (ICTP), Consejo Superior de Investigaciones Científicas (CSIC), C/Juan de la Cierva 3, Madrid 28006, Spain.
Researchers developed 3D printed pH-responsive hydrogels with antimicrobial properties using stereolithography. These novel materials, incorporating acrylic acid, offer tunable swelling and effectively combat Staphylococcus aureus infections.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- 3D Printing Technology
Background:
- Hydrogels are versatile biomaterials with applications in drug delivery and tissue engineering.
- Developing stimuli-responsive and antimicrobial materials is crucial for advanced biomedical applications.
- Stereolithography (SLA) 3D printing enables high-resolution fabrication of complex hydrogel structures.
Purpose of the Study:
- To fabricate 3D printed pH-responsive and antimicrobial hydrogels using SLA.
- To optimize hydrogel composition for tunable swelling and high structural fidelity.
- To evaluate the antimicrobial efficacy of the developed hydrogels against Staphylococcus aureus.
Main Methods:
- Hydrogel formulation using difunctional polyethylene glycol dimethacrylates and acrylic acid (AA).
- Stereolithography (SLA) 3D printing for micrometer-scale resolution fabrication.
- Optimization of UV penetration depth with a photoabsorber (Sudan I) for accurate 3D object printing.
- Swelling behavior analysis at different pH levels.
- Antimicrobial testing against Staphylococcus aureus.
Main Results:
- Successfully fabricated pH-responsive hydrogels with micrometer-scale resolution via SLA.
- Incorporation of AA enabled reversible swelling/shrinking in response to pH changes, with tunable extent.
- Optimized UV penetration depth using Sudan I resulted in high-accuracy 3D printed objects.
- All tested hydrogels exhibited significant antimicrobial activity against Staphylococcus aureus, even at low AA concentrations.
Conclusions:
- SLA 3D printing is a viable method for creating sophisticated pH-responsive and antimicrobial hydrogels.
- The developed hydrogels demonstrate tunable properties and potent antimicrobial efficacy, suitable for biomedical applications.
- The combination of pH-responsiveness and antimicrobial activity in 3D printed hydrogels opens new avenues for infection control and therapeutic delivery systems.
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