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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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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Colloidal Crystallization of Virus-Like Particles with Polycations.

Bettina Tran1, Timothy G Keys2, Milad Radiom2

  • 1Department of Chemistry, Food Research and Innovation Center, National Center of Competence in Research Bio-inspired Materials, University of Fribourg, Chemin du Musée 9, Fribourg, 1700, Switzerland.

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|July 3, 2025
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Summary
This summary is machine-generated.

Virus-like particles (VLPs) self-assemble with polycations into ordered structures. This research guides the design of tunable, pH-responsive biomaterials for drug delivery applications.

Keywords:
colloidal crystalsnanostructured materialself‐assemblysmall‐angle X‐ray scattering (SAXS)virus‐like particles

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Structural Biology

Background:

  • Virus-like particles (VLPs) are non-replicating protein nanocages with potential in biomedical applications like drug delivery.
  • Understanding VLP self-assembly into functional suprastructures is crucial for advanced biomaterial design.
  • The mechanisms governing VLP self-assembly with other molecules are not fully understood.

Purpose of the Study:

  • To investigate the self-assembly of Acinetobacter phage AP205 VLPs with polycations.
  • To explore the development of pH-responsive biomaterials using VLP-polycation complexes.
  • To elucidate the factors influencing the structural organization of VLP-based suprastructures.

Main Methods:

  • Utilized icosahedral AP205 VLPs (≈28 nm diameter).
  • Employed small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS).
  • Conducted zeta-potential measurements to analyze VLP-polycation interactions.

Main Results:

  • AP205 VLPs self-assembled with poly[2-(methacryloyloxy)ethyl] trimethylammonium chloride (pMETAC) into highly ordered suprastructures.
  • VLP suprastructure organization was significantly influenced by composition, pH, and ionic strength.
  • Directional interactions between VLPs and polycations were identified.

Conclusions:

  • The study provides insights into VLP self-assembly mechanisms with polycations.
  • Findings can guide the rational design of tunable, VLP-based biomaterials.
  • Developed pH-responsive biomaterials demonstrate potential for advanced applications.