Pontificia Universidad Católica de Chile Pontificia Universidad Católica de Chile
Benavides S., Mariotti-Celis M., Paredes M.J.C., Parada J.A., Franco W.V. (2020)

Thyme essential oil loaded microspheres for fish fungal infection: Microstructure, in vitro dynamic release and antifungal activity

Revista : Journal of Microencapsulation
Tipo de publicación : ISI Ir a publicación


Evaluate the effect of varying the droplet size of microspheres charged with thyme essential oil (TEO-MS) on their swelling (Sw), release rate (%RR) and in vitro antifungal activity against Saprolegnia sp.

TEO-MS obtained by ionic gelation were characterised through SEM microscopy and X-ray microtomography. Their Sw and RR% were evaluated at simulated fish-gastrointestinal conditions using gravimetric and spectrophotometric techniques.

For all evaluated droplet sizes (p???0.05), TEO was heterogeneously distributed inside of the MS and TEO-MS experimented agglomeration and sphericity loss after the drying process. Under gastric conditions, the acid pH (2.9) limited the Sw (50–100%) of TEO-MS, generating a low RR% (14–18%). Contrary, the slightly alkaline intestinal pH (8.1) favoured the Sw (?3.2 to 3.8 times) and therefore the RR% (42–63%).

TEO-MS (5–100?mg/mL) presented antifungal capacity onto Saprolegnia sp. after the simulated fish digestion, being the small droplet size once the most effective.