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Updated: Jul 18, 2026
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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
Published on: December 15, 2015
Layer-by-layer-assembled microfiltration membranes for biomolecule immobilization and enzymatic catalysis
V Smuleac1, D A Butterfield, D Bhattacharyya
1Department of Chemical and Materials Engineering and Center of Membrane Sciences, University of Kentucky, Lexington, Kentucky 40506, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 17, 2006
Summary
This study developed multilayer polyelectrolyte assemblies within membrane pores for enhanced protein immobilization. Optimal immobilization and stability were achieved when proteins and membranes had opposite charges, maintaining active site accessibility.
Area of Science:
- Biomaterials science
- Nanotechnology
- Surface chemistry
Background:
- Protein immobilization is crucial for biosensors and biocatalysis.
- Traditional methods face limitations in stability and efficiency.
- Membrane pore domains offer high surface area for immobilization.
Purpose of the Study:
- To create stable multilayer polyelectrolyte assemblies within membrane pores for protein immobilization.
- To investigate the impact of charge interactions on immobilization efficiency and stability.
- To assess the functional activity and accessibility of immobilized proteins.
Main Methods:
- Covalent attachment of the first polyelectrolyte layer (poly(L-glutamic acid) or poly(L-lysine)) to membrane surfaces and pores.
- Sequential electrostatic deposition of oppositely charged polyelectrolytes (poly(allylamine) hydrochloride or poly(styrenesulfonate)) to form multilayer assemblies.
- Immobilization of proteins onto the multilayer assemblies, varying protein and membrane charges.
- Assessment of protein immobilization levels, stability, and active site accessibility through affinity interactions and enzymatic assays.
Main Results:
- Multilayer polyelectrolyte assemblies were successfully formed within membrane pores.
- Protein immobilization and assembly stability were significantly higher when proteins and membranes had opposite charges.
- Active site accessibility of immobilized proteins was comparable to that in homogeneous phases, confirmed by avidin-biotin interaction and enzymatic activity.
- Enzyme regeneration was found to be facile.
Conclusions:
- Multilayer polyelectrolyte assemblies within membrane pores provide an effective platform for protein immobilization.
- Charge matching between proteins and membranes is critical for maximizing immobilization efficiency and stability.
- This method preserves protein functionality and offers advantages in enzyme regeneration, simplicity, and versatility.
