Immobilisation of oligo-peptidic probes for microarray implementation: characterisation by FTIR, atomic force...

Area of Science:

• Surface Chemistry
• Biomolecular Engineering
• Proteomics

Background:

• Protein microarrays are vital tools for studying biological interactions.
• Immobilizing proteins while maintaining biological activity on surfaces is a significant challenge.

Purpose of the Study:

• To develop and optimize a chemical functionalization method for orienting and covalently immobilizing oligo-peptides onto silica surfaces.
• To ensure the retained biological activity of immobilized oligo-peptides for microarray applications.

Main Methods:

• Derivatization of silica substrates with monofunctional silane to create uniform monolayers.
• Functionalization of the organic layer with amino-polyethyleneglycol.
• C-terminal activation and coupling of oligo-peptides with protected terminal amine.
• Characterization using FTIR spectroscopy, AFM, and fluorescence scanning microscopy.

Main Results:

• Achieved reproducible, dense, and uniform monolayers on silica surfaces.
• Optimized oligo-peptide grafting conditions (time, concentration, solvent).
• Demonstrated covalent and oriented immobilization of oligo-peptides, crucial for biological activity.

Conclusions:

• The developed method enables oriented and covalent immobilization of oligo-peptides on silica.
• This strategy is essential for preserving the biological activity of oligo-probes in microarrays.
• The method contributes to advancing the development of functional protein microarrays.