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    Performance of oil-in-water emulsions stabilized by different types of surface-active components

    Year: 2020

    Journal: Colloid Surf. B-Biointerfaces, Volume 190, JUN

    Authors: Paulo, Bruna Barbon; Alvim, Izabela Dutra; Reineccius, Gary; Prata, Ana Silvia

    Organizations: FAPESPFundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2017/14271-7, 2017/15410-0, 2009/54137-1]

    Keywords: Spray drying; Encapsulation; Emulsions; Proteins

    The emulsion stability depends on the physicochemical properties of the dispersed phase and their interaction with the continuous phase. Surface-active compounds (SAC) are added in emulsions to reduce the interfacial tension (IT) between these phases and keep the oil droplets stabilized. Moreover, small amounts of SAC can occupy intermolecular voids in the dried matrix, reducing the oxidation. However, the formulation must reflect a trade-off between protection and emulsion stabilization. Therefore, this work aimed to identify the minimum concentration of SAC (modified starch-MS, gelatin-GE, and whey protein isolate-WPI) ranging from 0.48 to 6% (w/w) to form and stabilize droplets of an unsaturated triglyceride (fish oil-FO) or a volatile oil (orange essential oil-OEO). GE did not change the IT (6.7 mN/m) and stabilized the emulsions only through an increase of the viscosity (similar to 42 mPas for FO-emulsions and similar to 97 mPas for OEO-emulsions), presenting high droplet size (similar to 10 mu m) and low surface charge (similar to 1.5 mV). WPI reduced the IT to a limit value (4.5 mN/m at 1.2 % w/w for OEO and 5.3 mN/m at 2.4 % w/w for FO), whereas MS reduce constantly the IT with the increase of the concentration for both oils (similar to 4.2 mN/m at 6 % w/w). Both WPI and MS-emulsions presented similar droplet size (similar to 2.0 mu m), but WPI presented higher surface charge of WPI-emulsions (- 45 mv) than MS-emulsions (- 30 mV). This study allowed to gain a consistent understanding of structure-property relationships on the use of SAC in emulsions.
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