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Structural and permeability characterization of biosynthetic PVA hydrogels designed for cell-based therapy
Eman H Nafea1, Laura A Poole-Warren, Penny J Martens
1a Graduate School of Biomedical Engineering , University of New South Wales , Sydney 2052 , NSW , Australia.
Journal of Biomaterials Science. Polymer Edition
|August 23, 2014
Summary
Adding extracellular matrix (ECM) components to synthetic hydrogels did not alter their physical properties. However, increasing functional groups in poly(vinyl alcohol) (PVA) hydrogels enhanced selectivity for larger proteins like immunoglobulin G (IgG).
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Tissue Engineering
Background:
- Synthetic hydrogels require extracellular matrix (ECM) components for biofunctionality in cell encapsulation.
- The impact of ECM incorporation on hydrogel permeability and physico-mechanical properties remains underexplored.
Purpose of the Study:
- To investigate how ECM analogues affect the permeability of poly(vinyl alcohol) (PVA) hydrogels.
- To examine the physico-mechanical characteristics of these modified PVA hydrogels.
Main Methods:
- Poly(vinyl alcohol) (PVA) was functionalized with varying methacrylate groups per chain (FG/c).
- Heparin and gelatin (1%) were incorporated into the PVA network.
- Hydrogel network properties and permeability to bovine serum albumin (BSA) and immunoglobulin G (IgG) were assessed.
Main Results:
- ECM incorporation did not alter PVA hydrogel mesh size, swelling, or compressive modulus.
- Heparin and gelatin did not affect BSA and IgG permeation through PVA hydrogels.
- Increasing FG/c from 7 to 20 significantly reduced IgG diffusion, indicating enhanced permselectivity.
Conclusions:
- Biosynthetic hydrogels with high FG/c PVA and low ECM content offer tunable permselectivity.
- These hydrogels show potential for biomedical applications requiring controlled molecular transport.
