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Electrosprayed octenyl succinic anhydride starch capsules for rosemary essential oil encapsulation.

B. Biduski,D. Kringel,R. Colussi,H. Hackbart,L. Lim,A. Dias,E. Zavareze

Published 2019 in International Journal of Biological Macromolecules

ABSTRACT

Octenyl succinic anhydride starch (OSA-starch) is often used as an emulsifier to protect bioactive compounds such as essential oils. In this study, rosemary essential oil was encapsulated in OSA-starch capsules via electrospraying an emulsion. Creaming was observed in the emulsions with 40% ethanol (v/v) 2 h after preparation, and phase separation occurred after 4 days. The emulsion with 20% ethanol revealed smaller droplets and lower zeta potential, and remained stable for 7 days. The morphology, loading capacity (LC), and encapsulation efficiency (EE) of the capsules, electrosprayed from the emulsions, were evaluated. The capsules from 20 and 30% aqueous ethanol (v/v) were smooth and spherical in shape with few dimpled. EE values were higher in the emulsions with 20% ethanol (82%-98%) when compared to those with 30% ethanol (89%-96%), except when 30% oil content was used. Fourier-transform infrared spectrometry suggested interaction of essential oil with the wall material. In summary, OSA-starch produced a stable emulsion that was suitable for electrospraying into capsules.

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