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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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Solution, Solubility, and Solubility Equilibrium
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Surface active complexes formed between keratin polypeptides and ionic surfactants.

Fang Pan1, Zhiming Lu1, Ian Tucker2

  • 1Biological Physics Group, Schuster Building, Oxford Road, The University of Manchester, Manchester M13 9PL, UK.

Journal of Colloid and Interface Science
|September 7, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed water-soluble keratin polypeptides from sheep wool. These keratin-surfactant complexes show promise for applications, effectively reducing surface tension.

Keywords:
Keratin polypeptidesNeutron reflectionProtein adsorptionProtein-surfactant complexesSurface activitySurface tension

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Area of Science:

  • Biomaterials Science
  • Protein Chemistry
  • Surface Chemistry

Background:

  • Keratins are vital structural proteins in skin and hair, offering desirable biomaterial properties like strength and moisture retention.
  • Developing water-soluble keratin derivatives is crucial for expanding their application range.

Purpose of the Study:

  • To create water-soluble keratin polypeptides from sheep wool.
  • To investigate the surface adsorption behavior of these polypeptides, with and without surfactants.
  • To explore the formation and properties of keratin-surfactant complexes.

Main Methods:

  • Wool fiber dissolution and purification using techniques like gel electrophoresis and dialysis.
  • Surface tension measurements to analyze adsorption and aggregation behavior.
  • Dynamic light scattering and Zeta potential measurements for characterizing particle size and surface charge.
  • Neutron reflection to study interfacial structure.

Main Results:

  • Successfully prepared water-soluble keratin polypeptides, with sodium dodecyl sulphate (SDS) aiding solubility by reducing disulfide bond formation.
  • Purified keratin polypeptides showed similar pH-dependent surface charge, indicating complete SDS removal.
  • Keratin-surfactant complexes (with SDS and dodecyltrimethylammonium bromide) significantly reduced surface tension more than polypeptides alone.
  • Neutron reflection confirmed the presence of both surfactants and keratin polypeptides at interfaces in these complexes.

Conclusions:

  • Water-soluble keratin polypeptides can be effectively produced from sheep wool.
  • Keratin-surfactant complexes exhibit enhanced surface activity, suggesting potential for improved delivery systems.
  • The study provides structural insights into the formation and behavior of these complexes at interfaces.