Obtention of Sacha Inchi (<i>Plukenetia volubilis Linneo</i>) Seed Oil Microcapsules as a Strategy for the Valorization of Amazonian Fruits: Physicochemical, Morphological, and Controlled Release Characterization

Abstract

Sacha inchi seed oil (SIO) is a promising ingredient for the development of functional foods due to its large amount of high-value compounds; however, it is prone to oxidation. This work aimed to obtain SIO microcapsules using conventional and ultrasound probe homogenization and using spray- and freeze-drying technologies as effective approaches to improve the long-term stability of functional compounds. The application of ultrasound probe homogenization improved the rheological and emulsifying properties and decreased the droplet size and interfacial tension of emulsions. The microcapsules obtained by both drying technologies had low moisture (1.64–1.76) and water activity (0.03–0.11) values. Spray-dried microcapsules showed higher encapsulation efficiency (69.90–70.18%) compared to freeze-dried ones (60.02–60.16%). Thermogravimetric analysis indicated that heat protection was assured, enhancing the shelf-life. Results suggest that both drying technologies are considered effective tools to produce stable microcapsules. However, spray-drying technology is positioned as a more economical alternative to freeze-drying.

Keywords

• controlled oil release
• emulsion
• micro-encapsulation
• omega-3
• bioavailability
• sodium caseinate