Microencapsulação de própolis em matrizes de polissacáridos e estudos de libertação controlada
2015
Penim, Diana Filipa Lopes | Alves, Vitor Manuel Delgado | Beirão da Costa, Maria Luísa
Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia
Afficher plus [+] Moins [-]Própolis is a resin produced by bees, which has several bioactive properties, the most important being its antioxidant activity. In the present work we proceeded to the microencapsulation, by spray drying, of a própolis ethanolic extract by using gum arabic, inulin and chitosan as a coating material. The ethanol extract analyzed própolis presented a quantity of phenolic compounds of about 44.3 mg GAE / g. In relation to the antioxidant activity that was 0.191 M Trolox / g of propolis and 0.251 M Trolox / g of propolis by DPPH method and FRAP, respectively. Compounds encapsulated in microparticles have continued to antioxidant activity. Microencapsulation of própolis in different matrices produced spherical microparticles having a smooth surface, their size varied between 5 and 25 micrometers. Regarding the controlled release of phenolic compounds, the release by gum arabic microparticles be smaller than the other matrices in acid media, and be higher in the neutral media. It was observed that the phenolic compounds release from the microparticles was low in both media, however in neutral medium, there it was a greater than in acidic medium.
Afficher plus [+] Moins [-]Mots clés AGROVOC
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