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Updated: May 28, 2026
09:39
Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications
Published on: February 7, 2021
Injectable microgel-hydrogel composites for prolonged small-molecule drug delivery
Daryl Sivakumaran1, Danielle Maitland, Todd Hoare
1Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7.
Biomacromolecules
|October 20, 2011
Summary
This study demonstrates novel injectable hydrogels with embedded microgels for sustained small-molecule drug delivery. These soft nanocomposites offer drug release for up to 60 days, outperforming individual components.
Area of Science:
- Biomaterials Science
- Drug Delivery Systems
- Nanotechnology
Background:
- Injectable hydrogels are promising for drug delivery but often suffer from rapid drug release.
- Microgels can encapsulate drugs but lack the necessary mechanical properties for sustained delivery.
- Developing advanced materials that combine the benefits of both hydrogels and microgels is crucial for effective therapeutic applications.
Purpose of the Study:
- To design and evaluate soft nanocomposite injectable hydrogels incorporating microgels for enhanced small-molecule drug delivery.
- To investigate the drug binding and release characteristics of these novel nanocomposite materials.
- To explore the tunability of drug release kinetics by adjusting material properties.
Main Methods:
- Synthesis of copolymer microgels (N-isopropylacrylamide/acrylic acid) with ionic and hydrophobic properties.
- Immobilization of microgels within an in situ-gelling hydrogel network using hydrazide-aldehyde cross-linking chemistry.
- Characterization of the resulting hydrogel-microgel soft nanocomposites.
- Evaluation of bupivacaine release kinetics from the nanocomposite hydrogels over an extended period.
Main Results:
- Successfully fabricated soft nanocomposite injectable hydrogels containing entrapped microgels.
- Demonstrated sustained release of bupivacaine (model drug) for up to 60 days.
- Achieved significantly prolonged drug release compared to using hydrogels or microgels alone (<1 week).
- Showed that drug release kinetics can be tuned by altering microgel/hydrogel drug-polymer interactions and hydrogel network density.
Conclusions:
- Soft nanocomposite injectable hydrogels with entrapped microgels represent a significant advancement in sustained drug delivery.
- These materials offer a versatile platform for controlled release of small molecules, with potential applications in local anesthesia and beyond.
- The ability to tune release profiles by material design provides a powerful tool for optimizing therapeutic outcomes.
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