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Related Concept Videos

Colloids03:22

Colloids

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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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Surface Active Agents01:27

Surface Active Agents

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Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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Solubility03:00

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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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Micelles01:30

Micelles

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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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The Colloidal State01:29

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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Related Experiment Video

Updated: May 6, 2026

Self-Nanoemulsification of Healthy Oils to Enhance the Solubility of Lipophilic Drugs
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Emulsions with unique properties from proteins as emulsifiers.

H Hoffmann1, M Reger1

  • 1University of Bayreuth BZKG/BayColl, Gottlieb-Keim-Str. 60, 95448 Bayreuth, Germany.

Advances in Colloid and Interface Science
|October 29, 2013
PubMed
Summary

Proteins form sticky emulsions with gel-like properties due to their multipolar nature. These stable emulsions, including Pickering emulsions, create robust scaffolds that resist collapse and can be reused.

Keywords:
EmulsionsProteinsSticky dropletsYield stress

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Biochemistry

Background:

  • Proteins are surface-active molecules capable of forming stable emulsions.
  • Protein-stabilized emulsions exhibit unique droplet interactions, leading to gel-like properties.
  • Unlike conventional surfactants, proteins' multipolar nature causes droplet adhesion rather than repulsion.

Purpose of the Study:

  • To investigate the properties of protein-stabilized emulsions.
  • To explore the formation and stability of Pickering emulsions using proteins and particles.
  • To understand the structural integrity and reusability of these emulsions.

Main Methods:

  • Formation of emulsions using various proteins.
  • Adsorption of proteins onto particles like clays to create hybrid Pickering emulsions.
  • Characterization of emulsion properties, including elasticity and stability.
  • Freeze-drying to assess the structural integrity of the protein scaffold.

Main Results:

  • Protein-covered oil droplets exhibit stickiness, resulting in gel-like emulsion properties.
  • Hybrid Pickering emulsions formed with proteins and clays demonstrate enhanced stability and elasticity.
  • The protein bilayer scaffold remains intact after freeze-drying, allowing for rehydration and reuse.
  • Emulsion elasticity varies depending on the specific protein used.

Conclusions:

  • Proteins are effective stabilizers for emulsions, imparting unique gel-like and paste-like properties.
  • Pickering emulsions stabilized by protein-particle hybrids offer superior stability and mechanical strength.
  • The robust, reusable scaffold formed by protein bilayers has significant implications for material design.