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Cellular Encapsulation in 3D Hydrogels for Tissue Engineering
Published on: October 26, 2009
Formation of three-dimensional hydrogel multilayers using enzyme-mediated redox chain initiation
Leah M Johnson1, Cole A Deforest, Aishwarya Pendurti
1Department of Chemical and Biological Engineering, ECCH 111 CB 424, University of Colorado, Boulder, Colorado 80309, USA.
ACS Applied Materials & Interfaces
|July 1, 2010
Summary
This study introduces a novel enzyme-mediated dip-coating method for creating 3D hydrogel layers. This technique offers precise control over layer thickness and enables the incorporation of molecules and nanoparticles for advanced material applications.
Area of Science:
- Biomaterials Engineering
- Polymer Chemistry
- Surface Science
Background:
- Traditional hydrogel fabrication methods often require harsh conditions or lack precise spatial control.
- Enzyme-mediated polymerization offers a milder alternative but has been limited in creating complex 3D structures.
- Developing methods for controlled, sequential hydrogel layer formation is crucial for advanced biomaterials.
Purpose of the Study:
- To develop a novel, iterative solution dip-coating technique for fabricating multi-layered 3D hydrogels.
- To investigate enzyme-mediated redox chain initiation for interfacial radical polymerization under mild conditions.
- To demonstrate the ability to incorporate small molecules and nanoparticles into hydrogel layers with controlled thickness.
Main Methods:
- Utilized glucose oxidase (GOX) for enzyme-mediated redox chain initiation.
- Employed an iterative solution dip-coating technique for sequential hydrogel layer polymerization.
- Investigated polymerization kinetics and layer thickness control by varying immersion times and polymer composition.
- Assessed the stability of polymerized hydrogel layers in aqueous environments.
Main Results:
- Successfully polymerized conformal, uniform poly(ethylene glycol) (PEG)-based hydrogel layers in seconds under ambient conditions.
- Achieved stable hydrogel layers that remained associated after 16 weeks of water incubation.
- Demonstrated successful incorporation of small molecules (rhodamine-B acrylate, fluorescein acrylate) and fluorescent nanoparticles.
- Showcased precise control over layer thickness (150-650 µm) based on immersion time and substrate composition.
- Validated sequential polymerization by combining GOX-mediated initiation with prior photopolymerization.
Conclusions:
- The developed GOX-mediated interfacial redox polymerization offers a novel, rapid, and mild approach for creating 3D hydrogel structures.
- This technique provides excellent temporal and spatial control over layer formation, enabling the fabrication of complex, stratified polymer architectures.
- The method's ability to incorporate various molecules and nanoparticles, coupled with its stability, makes it highly beneficial for diverse applications in biomaterials and tissue engineering.
