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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 Colloidal State

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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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Author Spotlight: Development and Characterization of Eco-Friendly Lignin-Based Microparticles for Enhanced Delivery of Bioflavonoids
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Lignin-Quercetin Hybrid Colloidal Particles as Sustainable Pickering Emulsifiers: A Bio-Based and Functional

Barbara Miqueletti de Oliveira1,2, Giovana Colucci1, Tatiana B Schreiner1

  • 1CIMO, LA SusTEC, Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal.

Molecules (Basel, Switzerland)
|March 14, 2026
PubMed
Summary

Researchers developed novel colloidal lignin-quercetin particles (CLQPs) for advanced formulations. These sustainable hybrid particles act as effective Pickering stabilizers, enhancing emulsion stability for cosmetic and pharmaceutical applications.

Keywords:
Pickering emulsionscolloidal lignin particlesligninquercetin

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Area of Science:

  • Materials Science
  • Biopolymer Chemistry
  • Colloid Science

Background:

  • Lignin, a globally abundant biopolymer, offers potential for value-added applications.
  • Colloidal lignin particles address handling challenges and provide beneficial properties like antioxidant and UV protection.
  • Plant-derived compounds, such as quercetin, can enhance lignin-based materials.

Purpose of the Study:

  • To synthesize and characterize novel colloidal lignin-quercetin particles (CLQPs) for the first time.
  • To evaluate the efficacy of CLQPs as Pickering stabilizers in emulsions.
  • To explore the potential of CLQPs in cosmetic and pharmaceutical formulations.

Main Methods:

  • Antisolvent precipitation was employed to create CLQPs.
  • Lignin and quercetin were solubilized in an aqueous acetone solution and precipitated using a pH 8 buffer.
  • Particle characterization included microscopy, contact angle measurements, and zeta potential analysis.

Main Results:

  • Colloidal lignin-quercetin particles (CLQP-50) with 50% (w/w) quercetin content were produced, exhibiting predominantly round shapes (<1 µm).
  • These particles demonstrated effective Pickering stabilization of oil/water emulsions (60/40 ratio) with high physical stability (stability index 0.01).
  • The stabilized emulsions displayed shear-thinning behavior and gel-like consistency, indicating robust stabilization.

Conclusions:

  • Lignin-quercetin hybrid colloidal particles represent a pioneering development in sustainable Pickering stabilizers.
  • The hybrid particles possess functional properties suitable for advanced formulation applications.
  • This research opens new avenues for utilizing lignin and natural compounds in cosmetic and pharmaceutical industries.