Versatile and nondestructive photochemical process for biomolecule immobilization.
Pascal Viel1, Justine Walter, Sophie Bellon
1CEA, IRAMIS, SPCSI Chemistry of Surfaces and Interfaces Group, F-91191 Gif-sur-Yvette, France.
Langmuir : the ACS Journal of Surfaces and Colloids
|January 16, 2013
Summary
A novel one-step method enables soft, covalent immobilization of biomolecules onto gold surfaces using photochemical grafting. This versatile technique is ideal for fabricating biochips and microarrays, demonstrated by a stable surface plasmon resonance imaging antibody platform.
Area of Science:
- Biochemistry
- Materials Science
- Surface Chemistry
Background:
- Covalent immobilization of proteins is crucial for biosensor development.
- Existing methods can be harsh, potentially damaging biomolecules.
- Need for a gentle, efficient, and versatile immobilization technique.
Purpose of the Study:
- To develop a one-step, soft method for covalent immobilization of unmodified biomolecules.
- To demonstrate the versatility of the method for various molecules and applications.
- To validate the method for biochip and microarray fabrication.
Main Methods:
- Photochemical grafting using 365 nm wavelength light.
- Electroreduction of 4-azidobenzenediazonium tetrafluoborate to form a polyazidophenylene layer on gold.
- Surface Plasmon Resonance Imaging (SPRi) for platform fabrication and testing.
Main Results:
- Successful covalent immobilization of various biomolecules, including G-protein and antibodies.
- Demonstrated non-destructive immobilization preserving biomolecule activity.
- Fabricated a stable SPRi antibody platform capable of multiple antigen binding and regeneration cycles without activity loss.
Conclusions:
- The developed photochemical grafting method offers a simple, versatile, and non-destructive approach for biomolecule immobilization.
- This technique is suitable for creating robust biochips and microarrays with long-term stability.
- The method shows significant potential for advanced biosensing applications.
