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Colloidal precipitates01:09

Colloidal precipitates

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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Characterization of pH-Dependent Reversible Self-Assembly of Amyloid Beta 1-40-Coated Gold Colloids
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Switchable electrostatic interactions between gold nanoparticles and coiled coil peptides direct colloid assembly.

Sara C Wagner1, Meike Roskamp, Helmut Cölfen

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pH triggers reversible nanoparticle-peptide organization via electrostatic forces. Helical structure, not just charge, drives peptide interaction, inducing fibrillation.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Biophysics

Background:

  • Understanding nanoparticle-peptide interactions is crucial for developing advanced functional materials.
  • Controlling self-assembly processes in nanomaterials requires precise triggers and understanding molecular recognition.

Purpose of the Study:

  • To investigate the role of electrostatic forces and pH in directing the organization of functionalized nanoparticles mediated by peptides.
  • To elucidate the structural requirements of peptides for effective interaction with charged nanoparticles.
  • To explore the impact of nanoparticle interaction on peptide self-assembly.

Main Methods:

  • Utilized gold nanoparticles functionalized with peptides.
  • Investigated nanoparticle-peptide interactions under varying pH conditions.
  • Compared interactions of helical peptides with random coil peptides of similar net charge.
  • Analyzed peptide self-assembly (fibrillation) upon interaction with nanoparticles.

Main Results:

  • Demonstrated that pH acts as a reversible trigger for nanoparticle-peptide organization based on electrostatic forces.
  • Established that the helical structure of the peptide is essential for interaction with charged gold nanoparticles, not solely net charge.
  • Observed that nanoparticle interaction induces fibrillation in the coiled coil peptide.

Conclusions:

  • pH-responsive electrostatic interactions enable controllable and repeatable organization of functionalized nanoparticles.
  • Peptide secondary structure plays a critical role in specific binding to charged nanoparticles.
  • Nanoparticle binding can induce conformational changes and self-assembly in peptides, leading to fibrillation.