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Microcapsules prepared from starch derivatives.

M G Duarte1, D Brunnel, M H Gil

  • 1Department of Biochemistry, FCTUC-University of Coimbra, Portugal.

Journal of Materials Science. Materials in Medicine
|May 1, 1997
PubMed
Summary
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Vinyl groups were added to soluble starch, creating a modified starch with low crystallinity. This modified starch was then used to create microcapsules via emulsion polymerization, demonstrating its potential in encapsulation applications.

Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Soluble starch is a widely available polysaccharide with potential for chemical modification.
  • Developing novel materials for microencapsulation is crucial for various industries.

Purpose of the Study:

  • To introduce vinyl groups onto soluble starch using 2-vinyl-4,4-dimethyl-2-oxazolin-5-one.
  • To characterize the modified starch and evaluate its suitability for microcapsule formation.

Main Methods:

  • Soluble starch was reacted with 2-vinyl-4,4-dimethyl-2-oxazolin-5-one to achieve vinyl functionalization.
  • The modified starch was analyzed using proton nuclear magnetic resonance (1H-NMR) and differential scanning calorimetry (DSC).
  • Microcapsules were prepared using the modified starch via interfacial crosslinking with dipropyleneglycol diacrylate (DPGDA) through water-in-oil emulsion polymerization.

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Main Results:

  • 1H-NMR spectra confirmed a high degree of substitution, indicating successful vinyl group introduction.
  • DSC thermograms revealed low crystallinity in the modified starch.
  • The modified starch was effectively used to form microcapsules through interfacial crosslinking.

Conclusions:

  • The synthesis of vinyl-functionalized starch was achieved with a high degree of substitution.
  • The modified starch exhibits low crystallinity, potentially enhancing its processability.
  • The successful preparation of microcapsules demonstrates the utility of this modified starch in encapsulation technologies.