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Affinity membranes as a tool for life science applications.
Heike Borcherding1, Hans-Georg Hicke, Dierk Jorcke
1ELIPSA GmbH, Berlin, Germany. borcherding@elipsa.de
Annals of the New York Academy of Sciences
|June 5, 2003
Summary
This study developed a polypropylene affinity membrane by grafting epoxy groups, enabling stable streptavidin immobilization. This method enhances enzyme activity through oriented immobilization, a key advance in affinity membrane technology.
Area of Science:
- Materials Science
- Biotechnology
- Surface Chemistry
Background:
- Affinity membrane technology is crucial for bioseparations.
- Polypropylene membranes offer a suitable matrix but require surface modification for biomolecule immobilization.
- Grafting functional groups enhances membrane properties for specific applications.
Purpose of the Study:
- To develop an efficient method for modifying polypropylene microfiltration membranes.
- To immobilize streptavidin onto the modified membrane surface for affinity applications.
- To evaluate the impact of oriented enzyme immobilization on specific enzymatic activity.
Main Methods:
- Utilized photopolymerization with glycidylmethacrylate to graft epoxy groups onto polypropylene membranes.
- Optimized UV irradiation conditions for a two-step photografting process.
- Covalently immobilized streptavidin and biotinylated alkaline phosphatase.
Main Results:
- Achieved a grafting degree of up to 1.2 mg/cm(2), increasing hydrophilicity.
- Obtained a high streptavidin immobilization capacity of approximately 65 μg/cm(2).
- Oriented immobilization of biotinylated alkaline phosphatase via streptavidin increased specific enzymatic activity sixfold.
Conclusions:
- Developed a stable and efficient method for creating polypropylene-based affinity membranes.
- Demonstrated the potential of epoxy-functionalized membranes for high-capacity biomolecule immobilization.
- Highlighted the benefits of oriented immobilization for enhanced enzyme performance in affinity systems.