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Colloidal precipitates01:09

Colloidal precipitates

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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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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Synthesis and Characterization of Supramolecular Colloids
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Internal Structure and Preferential Protein Binding of Colloidal Aggregates.

Da Duan1, Hayarpi Torosyan1, Daniel Elnatan2

  • 1Department of Pharmaceutical Chemistry & Quantitative Biology Institute, University of California, San Francisco , 1700 Fourth Street, San Francisco, California 94158-2550, United States.

ACS Chemical Biology
|December 17, 2016
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Summary

Dye-stabilized colloidal aggregates offer enhanced homogeneity and stability, allowing researchers to study their properties. These stable colloids show preferential binding to proteins, with potential applications in protein purification and drug discovery.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Drug Discovery

Background:

  • Colloidal aggregates are common artifacts in drug discovery, often inhibiting target proteins non-specifically.
  • Their inherent polydispersity and instability hinder the study of fundamental properties like packing.
  • Developing more stable and homogeneous colloidal systems is crucial for understanding and controlling these artifacts.

Purpose of the Study:

  • To investigate the structure and properties of dye-stabilized colloidal aggregates.
  • To explore the binding preferences and purification capabilities of these enhanced colloids.
  • To assess the potential utility of these colloids in biochemical applications.

Main Methods:

  • Small-angle X-ray scattering (SAXS) and multiangle light scattering (MALS) were used to analyze colloid structure.
  • Binding assays were performed to determine the selectivity of colloids for DNA, peptides, and proteins.
  • Enzyme activity was measured after binding, release, and recovery from the colloids.

Main Results:

  • Dye-stabilized colloids were characterized as filled spheres, exhibiting improved homogeneity and stability.
  • Colloids demonstrated a strong preference for binding proteins over peptides and DNA.
  • Specific proteins were selectively bound with up to 90-fold preference, and bound enzymes largely retained activity after release.

Conclusions:

  • Dye-stabilization significantly enhances the stability and homogeneity of colloidal aggregates.
  • These improved colloids exhibit selective protein binding, offering potential for purification applications.
  • The study provides insights into colloid mechanisms and highlights their utility in biochemical research and drug discovery.