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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Updated: Mar 24, 2026

Synthesis, Assembly, and Characterization of Monolayer Protected Gold Nanoparticle Films for Protein Monolayer Electrochemistry
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Protein adsorption on polyanion/polycation layer-by-layer assembled polyelectrolyte films.

Jen Ming Yang1, Rong-Ze Tsai1, Chih-Chin Hsu2

  • 1Department of Chemical and Materials Engineering, Chang Gung University, Kwei-Shan, Tao-Yuan, Taiwan.

Colloids and Surfaces. B, Biointerfaces
|March 4, 2016
PubMed
Summary

Protein adsorption on layer-by-layer (LbL) films follows a pseudo-second-order kinetic mechanism. This study evaluates albumin, fibrinogen, and fibronectin adsorption on various polyanion/polycation LbL films, determining adsorption equilibrium and rate constants.

Keywords:
Layer-by-layerPolyanionPolycationProtein adsorption

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Biomaterials Engineering

Background:

  • Layer-by-layer (LbL) self-assembly is a versatile surface modification technique.
  • Understanding protein adsorption kinetics on LbL films is crucial for biomaterial applications.

Purpose of the Study:

  • To evaluate protein adsorption kinetics on various polyanion/polycation LbL films.
  • To determine the suitability of kinetic models for describing protein adsorption.
  • To investigate the influence of different polyanions and polycations on protein adsorption.

Main Methods:

  • Fabrication of polyanion/polycation LbL films using sodium alginate, poly(γ-glutamic acid), poly(aspartic acid), chitosan, poly(allylamine hydrochloride), and poly(L-lysine).
  • Silanization of glass slides using 3-aminopropyltriethoxysilane (APTES).
  • Evaluation of albumin, fibrinogen, and fibronectin adsorption kinetics using pseudo-first-order, second-order kinetic, and intraparticle diffusion models.

Main Results:

  • Protein adsorption on all tested polyanion/polycation LbL films is well-described by the pseudo-second-order kinetic mechanism.
  • The pseudo-second-order model accurately predicts protein adsorption at equilibrium and the rate constants.
  • This kinetic behavior was consistent across different protein types and LbL film compositions.

Conclusions:

  • The pseudo-second-order kinetic model is a reliable approach for quantifying protein adsorption on diverse LbL films.
  • LbL assembly offers tunable surfaces for controlled protein interactions.
  • Findings contribute to the rational design of biomaterials with predictable protein adsorption properties.