Microencapsulation via spray drying is commonly employed for the protection of flavors and unsaturated oils against volatilization and oxidation. Despite the successful use in many applications, the influence of formulation in the effective improvement of the barrier properties of the particles is not clear yet. In this context, surface-active components are crucial for stabilizing the oil droplets during the emulsion step, which favors active retention. But also, they can contribute to the barrier properties of particles by filling voids in the matrix. Thus, this study investigated the influence of low levels of surface-active component (SAC) on the oxygen barrier properties of the particles. Orange essential oil (OEO) or fish oil (FO) (6% w/w) were incorporated in emulsions (30 % w/w) containing different SAC - modified starch (MS), gelatin (GE) or whey protein isolate (WPI), with 10 DE maltodextrin (MD) to complete the total solids. The emulsions were dried in a spray dryer in the same initial condition and evaluated for physicochemical characterization and oxidative stability using the Oxipres method. All particles presented similar mean size (8-10 µm), distribution size, water activity (~0.2 % w/w), and apparent density (~1 g/cm3). All matrices could increase the oxidative stability of both oils, but they absorbed the oxygen differently. Surprisingly, MS-particles presented one of the highest encapsulation efficiencies, but the highest oxygen absorption, whereas the GE matrix had presented the lowest encapsulation efficiency, but low oxygen absorption, similar to the WPI-particles. These results indicate that the oxidation stability did not match the amount of surface oil available to reactions, but the diffusion of oxygen through the matrix. The measurement of oxygen transfer could give a better understanding of how the composition of matrix can avoid undesirable reactions.

Low levels of surface active compounds for protection oxygen entrance in encapsulated flavors and unsaturated oils by spray drying

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.