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Ultrasound-assisted spray freeze-drying: a cutting-edge approach for gum Arabic cryogel powder production

  • 0Department of Food Science & Technology, College of Agriculture, Shiraz University, Shiraz, Iran.
Ultrasonics Sonochemistry +

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June 26, 2025

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June 26, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Ultrasound-assisted spray freeze-drying (US-SFD) significantly enhances gum Arabic powder properties. This method creates highly porous, lightweight gum Arabic cryogels with improved characteristics for various applications.

Area Of Science

  • Food Science and Technology
  • Materials Science
  • Chemical Engineering

Background

  • Gum Arabic, a natural polysaccharide, has limitations in its powdered form for industrial applications.
  • Spray freeze-drying (SFD) and ultrasound-assisted spray freeze-drying (US-SFD) are advanced techniques to improve powder properties.
  • Limited research exists on the specific impact of ultrasound during the freezing stage of SFD for gum Arabic.

Purpose Of The Study

  • To investigate the effects of US-SFD on the physicochemical and structural properties of gum Arabic cryogels.
  • To compare the characteristics of gum Arabic powders produced by SFD and US-SFD at different concentrations (1% and 3%).
  • To evaluate key powder properties including density, porosity, thermal behavior, morphology, crystallinity, color, and solubility.

Main Methods

  • Gum Arabic solutions at 1% and 3% concentrations were prepared.
  • Samples underwent spray freeze-drying (SFD) with and without ultrasound application during the freezing phase (US-SFD).
  • Characterization included measurements of bulk/tapped density, porosity, FTIR, XRD, color analysis, and solubility.

Main Results

  • US-SFD treatments resulted in significantly lower bulk densities and higher porosities (up to 99.66%) for gum Arabic powders.
  • FTIR analysis indicated alterations in hydrogen bonding, and XRD confirmed the amorphous nature of US-SFD produced powders.
  • Color analysis revealed variations, with SFD-1% showing the highest color difference (ΔE), and SFD-3% appearing more yellow.

Conclusions

  • US-SFD is an effective method for producing highly porous and lightweight gum Arabic cryogels.
  • The technique modifies the structural characteristics, including hydrogen bonding and crystallinity.
  • Further research is recommended to optimize ultrasound parameters and explore functional applications in food, pharmaceutical, and biomedical fields.

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