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A Tripeptide-Stabilized Nanoemulsion of Oleic Acid
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Nanoemulsion formation by the phase inversion temperature method using polyoxypropylene surfactants.

Gaihuan Ren1, Zhicheng Sun2, Zengzi Wang1

  • 1Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, Shandong 250100, PR China.

Journal of Colloid and Interface Science
|January 15, 2019
PubMed
Summary
This summary is machine-generated.

Polyoxypropylene (POP) surfactants can create nanoemulsions using the phase inversion temperature (PIT) method. Short POP chains enable nanoemulsion formation due to temperature-dependent hydration, yielding droplet sizes of 20-300 nm.

Keywords:
Long-chain fatty acidNanoemulsionPhase inversion temperaturePolyoxypropylene diaminePolyoxypropylene surfactant

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Area of Science:

  • Colloid and Surface Science
  • Materials Chemistry

Background:

  • Polyoxyethylene (POE) surfactants are commonly used for nanoemulsion preparation via the phase inversion temperature (PIT) method.
  • The temperature-sensitive nature of POE chains is crucial for this process.

Purpose of the Study:

  • To investigate the potential of polyoxypropylene (POP) surfactants in nanoemulsion preparation using the PIT method.
  • To synthesize and characterize POP surfactants for this application.

Main Methods:

  • POP surfactants were synthesized via electrostatic interactions.
  • Nanoemulsions were prepared using the PIT method with n-tetradecane-in-water systems.
  • Phase inversion temperatures (PITs) were determined by electrical conductivity; droplet size and morphology were analyzed using dynamic light scattering and cryogenic transmission electron microscopy.

Main Results:

  • Nanoemulsions were successfully formed using POP surfactants with short POP chains (approximately 2.5-6.1 units).
  • The formation mechanism is attributed to the temperature-dependent hydration of these short POP chains.
  • Resulting nanoemulsions exhibited spherical morphology with droplet radii ranging from 20 to 300 nm.

Conclusions:

  • Short-chain POP surfactants are effective for nanoemulsion preparation via the PIT method.
  • The temperature-dependent hydration of POP chains is key to forming stable nanoemulsions.
  • This offers an alternative to POE surfactants in PIT-based nanoemulsion formulation.