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Updated: Jun 25, 2026

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

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Adhesion forces between functionalized latex microspheres and protein-coated surfaces evaluated using colloid probe

Li-Chong Xu1, Bruce E Logan

  • 1Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA.

Colloids and Surfaces. B, Biointerfaces
|February 28, 2006
PubMed
Summary

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Understanding protein-surface interactions is key for bacterial adhesion. This study reveals specific molecular forces between proteins and functional groups on colloids, influencing adhesion strength and time-dependent behavior.

Area of Science:

  • Biophysics
  • Surface Science
  • Materials Science

Background:

  • Bacterial adhesion is crucial but poorly understood at the molecular level.
  • Protein interactions with functional groups on surfaces are complex.

Purpose of the Study:

  • To investigate molecular-scale adhesion forces between proteins and functionalized colloids.
  • To understand the influence of functional group chemistry, residence time, and ionic strength on protein adhesion.

Main Methods:

  • Colloid probe atomic force microscopy (AFM) was used.
  • Four proteins (bovine serum albumin, protein A, lysozyme, poly-d-lysine) and three functionalized colloids (COOH, NH2, OH) were studied.
  • Adhesion forces were measured as a function of colloid residence time and solution ionic strength.

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Last Updated: Jun 25, 2026

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
13:15

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Published on: July 18, 2014

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
09:48

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

Covalent Immobilization of Proteins for the Single Molecule Force Spectroscopy
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Covalent Immobilization of Proteins for the Single Molecule Force Spectroscopy

Published on: August 20, 2018

Main Results:

  • Hydroxyl (OH)-functionalized colloids generally showed higher adhesion forces with proteins compared to carboxyl (COOH) and amine (NH2) groups.
  • Protein A exhibited a notable strong interaction with COOH-functionalized colloids.
  • Adhesion force increased with residence time, fitting the model F=AT^n, with n≈0.21, suggesting water exclusion and protein rearrangement.
  • Adhesion forces decreased with increasing ionic strength, consistent with electrostatic screening.

Conclusions:

  • Specific molecular interactions between proteins and surface functional groups significantly impact colloidal adhesion.
  • Water exclusion and protein rearrangement are key time-dependent factors in adhesion.
  • These findings enhance our understanding of factors governing colloidal adhesion to surfaces.