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Related Experiment Videos

Fluid-bed microencapsulation of ascorbic acid

Z Knezevic1, D Gosak, M Hraste

  • 1Pliva Research Institute, Zagreb, Croatia.

Journal of Microencapsulation
|April 9, 1998
PubMed
Summary
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This study microencapsulated ascorbic acid using three hydrophobic coatings. Polymethacrylate, ethyl-cellulose, and waxy materials were evaluated for their effectiveness in protecting the vitamin.

Area of Science:

  • Pharmaceutical Technology
  • Materials Science
  • Chemical Engineering

Background:

  • Ascorbic acid (vitamin C) is a vital nutrient susceptible to degradation.
  • Microencapsulation offers a method to protect sensitive compounds and control their release.
  • Hydrophobic coatings are explored for enhanced stability and targeted delivery.

Purpose of the Study:

  • To microencapsulate ascorbic acid using three distinct hydrophobic coating materials.
  • To evaluate the fluidized bed coating process and its parameters.
  • To compare the efficacy of polymethacrylate, ethyl-cellulose, and waxy coatings on ascorbic acid properties.

Main Methods:

  • Fluidized bed top-spray method was employed for microencapsulation.
  • Polymethacrylate (water dispersion) and ethyl-cellulose/waxy materials (organic solutions) were used as coatings.

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  • Characterization included fluidized bed parameters (porosity, pressure drop), core content, density, crystal size, surface morphology, and release profiles.

    • Main Results:

    • The fluidized bed coating process parameters showed good agreement between experimental and calculated values.
    • Microencapsulated ascorbic acid properties varied significantly based on the coating material used.
    • Surface morphology and release profiles were distinct for each hydrophobic coating type.

    Conclusions:

    • The choice of hydrophobic coating material critically influences the properties and release characteristics of microencapsulated ascorbic acid.
    • Fluidized bed technology is suitable for microencapsulating ascorbic acid with different hydrophobic materials.
    • Further research can optimize coating selection for specific applications.