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Area of Science:

  • Materials Science
  • Biophysics
  • Surface Chemistry

Background:

  • Zein, a primary corn protein, is utilized in food packaging and as a keratin model.
  • Understanding zein's interfacial behavior is crucial for its applications.

Purpose of the Study:

  • To investigate the deposition and stability of zein monolayers from aqueous ethanol and acetic acid.
  • To analyze the impact of various surfactants (SDS, CTAB, Triton X-100, soapwort, cowherb, QBS) on zein monolayers.
  • To characterize the structural and mechanical properties of zein layers using neutron reflectivity.

Main Methods:

  • Deposition of zein monolayers from aqueous ethanol and acetic acid onto pure water.
  • Exchange of the subphase with 1% surfactant solutions (SDS, CTAB, Triton X-100, soapwort, cowherb, QBS).
  • Compression isotherms and neutron reflectivity (NR) measurements to analyze monolayer behavior and structure.

Main Results:

  • Zein monolayers on pure water exhibited reversible compression up to ~47 mN/m.
  • A liquid expanded-liquid expanded (LE-LE) transition occurred at ~30 mN/m, involving monolayer expansion and increased thickness (~1 to ~6 nm) and adsorption (~1.7 to ~5.0 mg/m²).
  • Synthetic surfactants (SDS, CTAB, Triton X-100) readily removed zein monolayers, with ionic surfactants causing continuous displacement and nonionic surfactants an orogenic-like mechanism. Zein layers from acetic acid showed higher mechanical strength against SDS and QBS compared to those from aqueous ethanol.

Conclusions:

  • Zein monolayers undergo significant structural changes upon interaction with surfactants.
  • The deposition solvent influences the mechanical stability and resistance of zein layers.
  • Zein's interfacial properties are modulated by surfactant type, offering insights for material design and application.