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Published on: June 6, 2012
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Development of Functional Biointerface Using Mixed Zwitterionic Silatranes
Thi Anh Hong Tran1,2, Van Truc Vu2, Chun-Jen Huang2,3
1Department of Biomedical Sciences and Engineering, National Central University, Jhong-Li, Taoyuan 320, Taiwan.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 11, 2024
Summary
Novel oligomeric silatranes, mercaptopropylsilatrane-zwitterionic monomer (MPS-MPC) and MPS-carboxylated poly(ethylene glycol) methacrylate (MPS-PEGMACOOH), were developed for advanced biosensor interfaces. These coatings reduce nonspecific adsorption and enable biomolecule conjugation for improved biosensor performance.
Area of Science:
- Materials Science
- Biotechnology
- Surface Chemistry
Background:
- Biosensor performance is challenged by background signals from clinical samples.
- Polymer coatings are crucial for tailoring biointerfaces and improving biosensor functionality.
- Developing effective strategies for multifunctional biosensor interfaces is essential.
Purpose of the Study:
- To introduce novel oligomeric silatranes for creating advanced biosensor interfaces.
- To evaluate the coating properties and biofouling resistance of these new materials.
- To demonstrate the utility of these coatings for biomolecule conjugation and enhanced biosensing.
Main Methods:
- Copolymerization of mercaptopropylsilatrane (MPS) with MPC and PEGMACOOH via thiol-ene polymerization.
- Deposition of oligomeric silatranes on silicon wafers.
- Characterization of coating properties (wettability, thickness, elemental composition) using contact angle meter, ellipsometry, and XPS.
- Evaluation of nonspecific adsorption (NSA) and signal discrimination using enzyme-linked immunosorbent assay (ELISA).
Main Results:
- MPS-MPC polymers formed hydrophilic films with excellent fouling repulsion against bacteria and proteins.
- A mixed coating (70% MPS-PEGMACOOH, 30% MPS-MPC) showed the thinnest coating and best wettability among COOH-terminated coatings.
- The mixed coating significantly reduced NSA and improved signal discrimination in ELISA.
- Functional COOH groups allowed for postmodification with biomolecules via NHS ester chemistry.
Conclusions:
- Novel mixed oligomeric silatranes offer a promising approach for biosensor interface design.
- These coatings provide dual functions: prevention of nonspecific binding and conjugation of biomolecules.
- The developed materials enhance biosensor sensitivity, specificity, and accuracy by minimizing interference.
