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Characterizing internal cavity modulation of corn starch microcapsules.

David Wulff1,2, Ariel Chan3, Qiang Liu4

  • 1Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada.

Heliyon
|November 9, 2020
PubMed
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Researchers developed tunable starch microcapsules (SMCs) by controlling corn starch granule swelling. This process allows for precise tuning of internal cavity size, enabling potential applications across various industries.

Area of Science:

  • Materials Science
  • Food Science
  • Nanotechnology

Background:

  • Corn starch granules naturally swell when heated in water.
  • The extent of swelling affects particle size and internal cavity dimensions.
  • Controlling this swelling is key to creating tailored microparticles.

Purpose of the Study:

  • To investigate the controlled swelling of corn starch granules.
  • To develop tunable starch microcapsules (SMCs) with adjustable internal cavity sizes.
  • To explore the potential applications of these novel microparticles.

Main Methods:

  • Heating normal corn starch granules in water under controlled time and temperature.
  • Utilizing scanning electron microscopy (SEM) to observe swelling.
Keywords:
Corn starchFood scienceMaterials scienceMorphologyNanotechnologyPartial gelatinizationPharmaceutical scienceStructureSwellingTunable microcapsule

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  • Employing brightfield, polarizing light, and confocal laser scanning microscopy for validation and loading studies.

    • Main Results:

    • Controlled swelling of corn starch granules leads to enlarged particles and increased internal cavity size.
    • Swelling extent, particle size, and solubility are correlated and can be tuned.
    • Confocal microscopy confirmed the ability to load SMCs with large molecules via diffusion.

    Conclusions:

    • Highly tunable starch microcapsules (SMCs) can be fabricated by controlling the swelling of corn starch granules.
    • The size of the internal cavity can be precisely regulated.
    • These novel microparticles show promise for diverse industrial applications.