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  • 1Department of Fibre and Polymer Technology, School of Chemical Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 11, 2012
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Researchers developed functional gold sensor surfaces using dendritic scaffolds to combat antibiotic resistance. Mannose-decorated surfaces showed significantly enhanced bacterial capture for Escherichia coli, offering a new method for infection detection and control.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Antibiotic resistance in pathogenic bacteria necessitates novel detection and suppression methods.
  • Understanding bacterial adhesion at the molecular level is crucial for developing effective antimicrobial strategies.
  • Bioactive and multivalent sensor surfaces are key to advancing infection control technologies.

Purpose of the Study:

  • To create functional sensor surfaces with optimized molecular packaging for detecting and suppressing bacterial infections.
  • To explore dendritic scaffolds based on 2,2-bis(methylol)propionic acid (bis-MPA) for self-assembled dendritic monolayers (SADMs) on gold surfaces.
  • To investigate how structural variations in dendritic scaffolds influence surface properties and bacterial recognition.

Main Methods:

  • Fabrication of self-assembled dendritic monolayers (SADMs) on gold surfaces using aqueous-soluble dendritic structures with sulfur functionalities.
  • Systematic variation of sulfur type (disulfide/thiol), dendritic framework size (G1-G3), linker distance (4/14 Å), and end-group functionality (hydroxyl/mannose).
  • Characterization of SADM formation and properties using surface plasmon resonance (SPR) and resonance-enhanced surface impedance (RESI).

Main Results:

  • Homogenous SADMs were rapidly formed on gold surfaces across various dendritic structures.
  • Achieved molecular covering densities ranged from 0.33-2.2 molecules·nm(-2) with functional availability of 0.95-5.5 groups·nm(-2).
  • Mannose-functionalized G3 dendritic surfaces demonstrated a 2.5-fold increase in Escherichia coli capture compared to hydroxylated surfaces.

Conclusions:

  • The developed SADM methodology provides a facile route to fabricate functional gold sensor surfaces.
  • This approach allows controlled probing of surface interactions between multivalently presented motifs and bacterial cells.
  • The enhanced bacterial recognition by mannosylated surfaces highlights potential for advanced diagnostics and therapeutics against bacterial infections.