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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
10:37

Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy

Published on: March 16, 2020

A general and efficient cantilever functionalization technique for AFM molecular recognition studies.

Carleen M Bowers1, David A Carlson, Alexander A Shestopalov

  • 1Department of Chemistry, Duke University, Durham, NC 27708, USA.

Biopolymers
|July 19, 2012
PubMed
Summary

Researchers developed a new method to attach biomolecules to atomic force microscopy (AFM) cantilevers using stable Si-C bonds. This technique improves molecular recognition force spectroscopy by creating uniform epitope density and orientation for reliable noncovalent interaction studies.

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Area of Science:

  • Surface science
  • Biophysics
  • Materials science

Background:

  • Atomic force microscopy (AFM) is crucial for studying molecular interactions.
  • Current AFM cantilever modification methods using Si-O bonds are prone to hydrolysis and aggregation.
  • A need exists for stable immobilization techniques for diverse molecules on AFM probes.

Purpose of the Study:

  • To develop a robust method for attaching biomolecules to silicon nitride AFM cantilevers.
  • To create stable, oriented monolayers for molecular recognition force spectroscopy.
  • To investigate noncovalent protein-ligand interactions with enhanced precision.

Main Methods:

  • Formation of stable monolayers on silicon nitride AFM tips via hydrosilylation.
  • Utilizing hydrogen-terminated AFM probes and protected α-amino-ω-alkene.
  • Subsequent conjugation of biomolecules through a stable Si-C bond.

Main Results:

  • Successfully formed stable, highly oriented monolayers on AFM cantilevers.
  • Demonstrated the utility of Si-C bonded biomolecules for investigating protein-ligand interactions.
  • Measured unbinding profiles of lactose-galectin-3 interactions using the new technique.

Conclusions:

  • The Si-C bond attachment technique offers a general and simple approach for AFM cantilever modification.
  • This method enhances the reliability and applicability of molecular recognition force spectroscopy.
  • The technique is expandable for immobilizing a wide range of epitopes for AFM studies.