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Efficient and Tunable Three-Dimensional Functionalization of Fully Zwitterionic Antifouling Surface Coatings
Stefanie C Lange1, Esther van Andel1,2, Maarten M J Smulders1
1Laboratory of Organic Chemistry, Wageningen University , Stippeneng 4, 6708 WE Wageningen, The Netherlands.
Langmuir : the ACS Journal of Surfaces and Colloids
|October 1, 2016
Summary
Researchers developed a novel zwitterionic monomer for creating advanced polymer brushes. This innovation significantly improves biosensor performance by combining excellent antifouling properties with specific biomolecule detection, enhancing sensitivity and selectivity.
Area of Science:
- Materials Science
- Surface Chemistry
- Biotechnology
Background:
- Nonspecific binding (biofouling) in biosensors reduces sensitivity and selectivity.
- Zwitterionic polymer brushes offer excellent antifouling properties.
- Existing methods for modifying antifouling brushes compromise either antifouling capability or binding capacity.
Purpose of the Study:
- To develop a new approach for creating highly effective antifouling surfaces for biosensors.
- To integrate antifouling properties with efficient surface modification capabilities.
- To enhance biosensor performance by minimizing background noise and maximizing specific signal detection.
Main Methods:
- Synthesized a novel sulfobetaine-based zwitterionic monomer containing a clickable azide group.
- Copolymerized the novel monomer with a standard sulfobetaine monomer to create azide-functionalized polymer brushes.
- Utilized strain-promoted alkyne azide click chemistry for subsequent functionalization with recognition units (e.g., biotin).
- Tested the functionalized brushes on Si3N4 surfaces for antifouling and specific binding (avidin).
Main Results:
- Achieved highly antifouling surface coatings with tunable numbers of clickable azide groups throughout the brush.
- Demonstrated successful 3D-functionalization of the zwitterionic brushes with recognition units via click chemistry.
- Showcased a proof-of-principle with biotin-functionalized brushes exhibiting excellent antifouling and specific avidin binding from a protein mixture.
- Observed a significant improvement in the signal-to-noise ratio compared to traditional surface modification techniques.
Conclusions:
- The novel zwitterionic monomer and resulting functionalized brushes offer a viable strategy for developing high-performance biosensors.
- This approach overcomes limitations of previous methods by maintaining antifouling properties while enabling efficient specific binding.
- The developed coatings significantly enhance biosensor sensitivity and selectivity, applicable to a wide range of surfaces and specific applications.
