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Scanning electron microscopy studies of protein-functionalized atomic force microscopy cantilever tips.

M Micic1, A Chen, R M Leblanc

  • 1Department of Chemistry, University of Miami, Florida, USA.

Scanning
|February 2, 2000
PubMed
Summary

Scanning electron microscopy revealed that protein coatings on atomic force microscopy (AFM) tips form uniform layers. However, avidin-functionalized tips showed debris contamination after use, impacting their performance in ligand-receptor binding studies.

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Area of Science:

  • Biophysics
  • Materials Science
  • Surface Science

Background:

  • Atomic force microscopy (AFM) is a powerful tool for studying single molecular interactions.
  • Protein functionalization of AFM tips enables the investigation of specific ligand-receptor binding events.
  • Understanding the stability and morphology of protein coatings on AFM tips is crucial for reliable measurements.

Purpose of the Study:

  • To characterize the surface morphology of protein-coated AFM cantilever tips using scanning electron microscopy (SEM).
  • To assess the stability and potential degradation of protein coatings on AFM tips during force measurements.

Main Methods:

  • Scanning electron microscopy (SEM) was employed to visualize the surface of protein-functionalized AFM tips.
  • Bovine serum albumin (BSA) was used to create initial protein coatings on silicon nitride cantilevers.

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  • Avidin-functionalized tips were subjected to force measurements using biotinylated agarose beads.

    • Main Results:

    • SEM imaging demonstrated spontaneous adsorption of bovine serum albumin (BSA), forming a uniform protein layer on AFM cantilevers.
    • Further protein deposition did not significantly alter the surface morphology of the BSA-coated tips.
    • Avidin-functionalized tips exhibited debris contamination after force measurements with biotinylated agarose beads, suggesting material transfer.

    Conclusions:

    • Protein coatings, such as BSA, can form stable and uniform layers on AFM tips.
    • Avidin-functionalized AFM tips may be susceptible to contamination and functional deterioration when interacting with certain substrates like agarose beads.
    • These findings highlight the importance of considering tip stability and potential contamination in AFM-based single-molecule force spectroscopy experiments.