Model for measuring light stability of photolabile substances in powder beds using spray dried bixin microcapsules

Cecilia K. Curi-Borda, Vandana Tannira, Niko Gentile, Juan Antonio Alvarado, Björn Bergenståhl

Research output: Contribution to journalArticlepeer-review

Abstract

Light stability of different spray dried microencapsulated powders containing the natural colorant bixin was evaluated for 30 days. The encapsulating materials evaluated were sucrose, maltodextrin, and mixtures including gum arabic and pectin as encapsulation enhancers. The photostability of two sets of encapsulated material was compared: one containing purified bixin, and one being an annatto extract composed of bixin and native carbohydrates. The photodegradation of bixin was monitored by vis-spectroscopy and HPLC. The observed degradation was 30–70 times slower compared to unprotected colorants. A model was established for describing the degradation process of the colorant in a solid particle form presented as powder beds. It was concluded that encapsulation in combination with light scattering by the matrix structure had a significant effect on the protection of the colorant. The overall enhancement of bixin stability towards UVA-visible light can be attained by microencapsulation through spray-drying. A correlation was observed between encapsulation efficiency and improved photostability of the colorant.

Original languageEnglish
Article number127131
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume627
DOIs
StatePublished - 20 Oct 2021

Bibliographical note

Funding Information:
We thank the Swedish International Development Cooperation Agency SIDA for financial support, under the SIDA-UMSA Cooperation Agreement 75000554 and cooperation between LU and UMSA. We also thank the Chief Executive Officers of UMSA that facilitated the admission of the funding to develop this research.

Funding Information:
We thank the Swedish International Development Cooperation Agency SIDA for financial support, under the SIDA-UMSA Cooperation Agreement 75000554 and cooperation between LU and UMSA. We also thank the Chief Executive Officers of UMSA that facilitated the admission of the funding to develop this research.

Publisher Copyright:
© 2021 The Authors

Keywords

  • Bixin (PubChem CID: 134688154)
  • Bixin powder beds
  • Encapsulation efficiency
  • Light scattering
  • Light stability
  • Photo-kinetical model
  • Photodecomposition quantum yield

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