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Size determinations of colloidal fat emulsions: a comparative study.

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Commercially available fat emulsions were analyzed for particle size using multiple methods. Lipofundin N showed larger droplet sizes and broader distributions compared to Lipofundin MCT and Lipidem.

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Area of Science:

  • Colloid and Surface Science
  • Pharmaceutical Nanotechnology
  • Materials Characterization

Background:

  • Particle size and distribution are critical for colloidal dispersion performance and safety.
  • Fat emulsions are widely used in pharmaceutical and nutritional applications.
  • Accurate characterization of submicron particles is essential for quality control.

Purpose of the Study:

  • To compare different particle sizing techniques for commercial fat emulsions.
  • To determine the size and size distribution of Lipofundin N, Lipofundin MCT, and Lipidem.
  • To evaluate asymmetrical flow field-flow fractionation (AF4) coupled with multi-angle laser light scattering (MALS) for emulsion analysis.

Main Methods:

  • Photon Correlation Spectroscopy (PCS)
  • Laser Diffraction (LD) using Mastersizer 2000 and Coulter LS 13 230
  • Asymmetrical Flow Field-Flow Fractionation (AF4) coupled with Multi-Angle Laser Light Scattering (MALS)
  • Cryo-electron microscopy (Cryo-EM) for ultrastructure investigation

Main Results:

  • All methods yielded comparable, though slightly different, mean sizes and size distributions.
  • Lipofundin N exhibited larger mean droplet sizes (350-400 nm) and broader distributions than Lipofundin MCT and Lipidem (280-320 nm).
  • Lipidem showed slightly smaller sizes than Lipofundin MCT across all methods.
  • AF4-MALS demonstrated high reproducibility and promising capabilities for separating and collecting size-homogeneous fractions.

Conclusions:

  • Multiple particle sizing techniques can be applied to fat emulsions, with AF4-MALS showing significant promise.
  • Lipofundin N has a larger particle size profile compared to Lipofundin MCT and Lipidem.
  • Accurate and reproducible characterization of fat emulsion particle size is achievable, crucial for product development and safety.