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Related Concept Videos

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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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Colloidal Nanoparticles of a β-Cyclodextrin/L-Tryptophan Inclusion Complex for Use as Pickering Emulsion Stabilizers.

Junyi Wang1, Amin Zarei1, Leila Khazdooz1

  • 1Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca 14853, NY, USA.

Food Hydrocolloids
|October 21, 2024
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Summary

Beta-cyclodextrin (β-CD) and tryptophan (Trp) nanoparticles stabilize Pickering emulsions. Optimized conditions yielded oil-in-water emulsions with 180-day stability, while others formed hydrophobic nanoparticles for water-in-oil emulsions.

Keywords:
Clean Label EmulsifierL-TryptophanPickering EmulsionStorage Stabilityβ-Cyclodextrin

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Pickering emulsions offer an alternative to conventional emulsions stabilized by surfactants.
  • Beta-cyclodextrin (β-CD) and tryptophan (Trp) are biocompatible molecules with potential applications in stabilization.

Purpose of the Study:

  • To synthesize and characterize β-cyclodextrin-tryptophan (β-CD/Trp) nanoparticles.
  • To investigate the use of these nanoparticles as stabilizers for Pickering emulsions.
  • To determine the optimal conditions for stable oil-in-water and water-in-oil Pickering emulsions.

Main Methods:

  • Synthesis of β-CD/Trp inclusion complexes via an antisolvent approach.
  • Characterization using Scanning Electron Microscopy (SEM) and Powder X-ray Diffraction (PXRD).
  • Preparation and stability testing of Pickering emulsions under varying β-CD:Trp ratios and pH levels.

Main Results:

  • Successful formation of crystalline β-CD/Trp nanoparticles with a channel-like structure.
  • Hydrophilic β-CD/Trp nanoparticles at pH 9 (1:0.1 ratio) stabilized oil-in-water emulsions with 180-day storage stability.
  • Hydrophobic β-CD/Trp nanoparticles at pH 5 (1:0.1 or 1:1 ratio) stabilized water-in-oil emulsions.

Conclusions:

  • β-CD/Trp nanoparticles can effectively stabilize Pickering emulsions.
  • The hydrophilicity/hydrophobicity of the nanoparticles, and thus emulsion type, can be tuned by adjusting pH and β-CD:Trp ratio.
  • This offers a route to creating stable, biocompatible emulsions for various applications.