Design of liquid emulsions to structure spray dried particles

Effect of α-tocopherol on oxidative stability of oil during spray drying and storage of dried emulsions

“…3.5 g /100 g of oil) were prepared by following the protocol described previously by Hernandez-Sanchez et al (2015) for the preparation of stable emulsions. Briefly, the protocol consisted in first, an emulsification of oil in water containing Tween ® 20 in order to obtain a first emulsion with the required oil size (e.g.…”

“…The refractive index values used for the dispersing water and for the oil droplets were 1.33 and 1.475 respectively (Hernandez-Sanchez et al ,2015) …”

“…The emulsions flow rate was 25 g.min −1 . Drying air was taken from the ambient by a fan (43 Hz) with a flow rate of 110 kg.h −1 (Hernandez et al, 2015). The inlet air temperature was fixed at 200 ºC and its outlet temperature varied from 94 to 110 ºC for the different trials.…”

“…The particle size distribution of powders was measured by laser light diffraction (Mastersizer 2000, Malvern, FR) in dry mode (Scirocco 2000) (Hernandez-Sanchez et al ,2015).…”

“…This encapsulation of lipophilic compounds involves two main steps: a) the dispersion of lipophilic compounds in oil-in-water emulsions (Jayasinghe et al, 2013;Wang et al, 2016;Di Mattia et al, 2009) and b) the spray drying of these emulsions in order to replace the liquid barrier formed during emulsification by another stronger solid barrier (encapsulation matrix), providing protection against degradation and volatile losses. The physical barrier or encapsulation matrix is mainly formed by the wall materials entrapping lipophilic compounds within (Ahn et al, 2012;Damerau et al, 2014;Hernandez-Sanchez et al, 2015;Quintanilla-Carvajal., 2014;Carneiro et al, 2012;Turchiuli et al, 2013Turchiuli et al, , 2014 M A N U S C R I P T ACCEPTED MANUSCRIPT Munoz-Ibanez et al, 2015). During the encapsulation of lipophilic compounds by spray drying, emulsions are pumped, atomized and later dried in contact with a hot air current resulting in a fine dried powder (20-100 m) with low water activity and modified handling properties (Fuchs et al, 2006;Gharsallaoui et al, 2007;Tonon et al, 2011;Kaushik et al, 2014).…”