[Functionalization of aminomodified probes for atomic force microscopy].

Area of Science:

• Biophysics
• Materials Science
• Nanotechnology

Background:

• Atomic force microscopy (AFM) is a powerful tool for nanoscale imaging and force measurements.
• Functionalizing AFM probes is crucial for specific molecular interactions and recognition studies.
• Bovine serum albumin (BSA) is a common protein used in bioconjugation and surface modification.

Purpose of the Study:

• To develop a reliable method for functionalizing AFM probes with bovine serum albumin (BSA) for molecular recognition.
• To characterize the modified probes and confirm the successful immobilization of BSA.
• To assess the utility of these functionalized probes in studying molecular interactions.

Main Methods:

• AFM probe modification through silanization to introduce amino groups.
• Covalent linkage of a homobifunctional cross-linker to the amino-modified probe surface.
• Immobilization of bovine serum albumin (BSA) onto the cross-linked probe surface.
• Characterization using AFM to measure adhesion forces and visualize immobilized biomolecules.

Main Results:

• Successfully modified AFM probes with BSA through a three-stage process.
• Characterization confirmed successful surface modification and BSA attachment via adhesion force measurements.
• Visualization demonstrated the presence of BSA and supercoiled DNA on modified mica surfaces, validating probe functionality.

Conclusions:

• The developed three-stage functionalization protocol effectively prepares BSA-modified AFM probes.
• These functionalized probes are suitable for molecular recognition studies and nanoscale biophysical investigations.
• The method provides a robust platform for creating tailored AFM probes for specific biological applications.