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Development of vegetable extracts by microencapsulation

A Ribeiro1, P Arnaud, S Frazao

  • 1Université René Descartes, Faculté de Pharmacie Paris V, Laboratoire de Pharmacie galénique, Paris, France.

Journal of Microencapsulation
|December 12, 1997
PubMed
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Microencapsulation protects essential oils, but some oil loss can occur. This study evaluated gelatin-polyphosphate methods for peppermint and rosemary oils, analyzing particle size, oil content, and component stability.

Area of Science:

  • Food Science and Technology
  • Chemical Engineering
  • Materials Science

Background:

  • Microencapsulation of essential oils (EOs) provides protection against degradation and enables the combination of multiple extracts.
  • Complex coacervation is a common method for EO microencapsulation, but challenges remain in stabilizing EOs against evaporation and dissolution.
  • The efficacy of gelatin-polyphosphate complex coacervation for EO microencapsulation requires further investigation.

Purpose of the Study:

  • To evaluate the effectiveness of the gelatin-polyphosphate method for microencapsulating peppermint and rosemary essential oils.
  • To analyze key parameters of the microcapsules, including granulometric size distribution, oil content, and encapsulation yield.
  • To assess the stability of essential oil components during the microencapsulation process using Gas Chromatography (GC).

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Main Methods:

  • Microencapsulation of peppermint and rosemary essential oils using the gelatin-polyphosphate complex coacervation method.
  • Analysis of microcapsule granulometric size distribution, oil content (%), and encapsulation yield (%).
  • Gas Chromatography (GC) analysis of essential oils before and after microencapsulation to determine component loss.

Main Results:

  • The study quantified the granulometric size distribution, oil content, and encapsulation yield for both peppermint and rosemary oil microcapsules.
  • Gas Chromatography analysis revealed the extent of loss of specific essential oil components during the microencapsulation process.
  • Variations in oil loss were observed, dependent on the type of essential oil encapsulated.

Conclusions:

  • The gelatin-polyphosphate method is effective for microencapsulating essential oils, but optimization is needed to minimize oil loss.
  • Understanding the specific component stability of different essential oils is crucial for successful microencapsulation.
  • Further research can focus on improving encapsulation techniques to enhance the retention of volatile essential oil components.