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Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique
Published on: September 20, 2011
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Nanopatterned Protein Films Directed by Ionic Complexation with Water-Soluble Diblock Copolymers
Bokyung Kim1, Christopher N Lam1, Bradley D Olsen1
1Department of Chemical Engineering, Massachusetts Institute Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United.
Macromolecules
|June 7, 2014
Summary
This study demonstrates aqueous processing of protein-templated nanopatterned films using pH-responsive block copolymers. These films enable controlled protein release and immobilization, maintaining protein activity.
Area of Science:
- Materials Science
- Polymer Chemistry
- Biotechnology
Background:
- Developing aqueous-based methods for creating functional nanopatterned materials is crucial for advanced applications.
- Block copolymers offer versatile self-assembly properties for nanostructure fabrication.
- Protein-polymer interactions are key for biomaterials but often require complex processing.
Purpose of the Study:
- To demonstrate the use of ionic interactions for protein templating and block copolymer self-assembly in aqueous environments.
- To create nanopatterned films using thermally and pH-responsive block copolymers.
- To investigate pH-dependent protein-polymer complexation and its effect on film properties and protein release.
Main Methods:
- Synthesis of poly(N-isopropylacrylamide-b-2-(dimethylamino)ethyl acrylate) (PNIPAM-b-PDMAEA) diblock copolymers via controlled reversible addition-fragmentation chain-transfer (RAFT) polymerization.
- Characterization of protein-polymer complexation using dynamic light scattering (DLS), UV-Vis spectroscopy, and zeta potential measurements.
- Fabrication of nanostructured films via spin casting followed by aqueous processing and immobilization.
Main Results:
- Established pH-dependent ionic complexation between mCherry protein and PDMAEA block, influencing coacervate micelle size.
- Demonstrated successful formation of nanopatterned films from protein-block copolymer coacervates using only aqueous conditions.
- Observed significantly faster protein release rates at higher pH (9.2 and 7.8) compared to lower pH (6.4) due to altered interactions.
- Confirmed high protein activity (80%) post-processing, even after dehydration and confinement within the films.
Conclusions:
- Ionic interactions can effectively direct protein templating and block copolymer self-assembly for nanopatterned film fabrication in aqueous media.
- The synthesized PNIPAM-b-PDMAEA copolymers enable tunable protein release and immobilization, with pH controlling release kinetics.
- The developed materials maintain protein activity, highlighting their potential for biomaterial applications like controlled drug delivery and protein immobilization matrices.
