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Zein Particle-Stabilized Water-In-Water Emulsion as a Vehicle for Hydrophilic Bioactive Compound Loading of

Jia-Feng Chen1, Jian Guo1, Si-Hong Liu1

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Summary

This study developed a novel water-in-water emulsion using soy protein isolate and guar gum to protect riboflavin from light damage. The system effectively stabilized the vitamin, preserving its color and integrity during UV exposure.

Keywords:
food structure designhydrophilic bioactivesphotodegradationriboflavinwater-in-water emulsion

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Area of Science:

  • Food Science
  • Colloid and Surface Chemistry
  • Biomaterials Engineering

Background:

  • Vitamins and flavonoids are essential bioactives susceptible to photodegradation.
  • Food processing and storage conditions can compromise the stability of these compounds.
  • Developing effective delivery systems is crucial for preserving bioactive integrity.

Purpose of the Study:

  • To create a particle-stabilized water-in-water (W/W) emulsion for loading riboflavin.
  • To investigate the stabilization mechanism of soy protein isolate (SPI) and guar gum (GG) in the emulsion.
  • To evaluate the photoprotective effect of the W/W emulsion on riboflavin.

Main Methods:

  • Formulation of a W/W emulsion using SPI and GG with varying proportions.
  • Stabilization of the emulsion using pectin-modified zein-based particles (ZPs).
  • Confocal microscopy to analyze microstructure and fluorescence spectroscopy to assess riboflavin photodegradation.

Main Results:

  • A stable SPI-in-GG W/W emulsion microstructure was successfully constructed.
  • Zein-based particles effectively stabilized the emulsion interface.
  • The W/W emulsion significantly delayed riboflavin photodegradation under UV irradiation for 8 hours, maintaining its color.

Conclusions:

  • The developed W/W emulsion system provides an effective strategy for delivering light-sensitive bioactives like riboflavin.
  • The differential binding affinities of SPI and GG to riboflavin enabled targeted loading.
  • This structured emulsion architecture shows promise for enhancing the stability and delivery of sensitive food components.